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A STUDY OF NEW ENGLAND SEISMICITY

Quarterly Earthquake Report

January - March, 2000


new england
seismic network

      

Weston Observatory
381 Concord Road
Weston, MA 02493
Earth Resources Lab
Massachusetts Institute of Technology
42 Carleton Street
Cambridge, MA 02142



NEW ENGLAND SEISMIC NETWORK

John E. Ebel, Principal Investigator
Weston Observatory
Dept. of Geology and Geophysics
Boston College
381 Concord Road
Weston, MA 02493
Email: ebel@bc.edu
Award # 1434-HQ-98-AG-01943
M. Nafi Toksöz, Principal Investigator
Earth Resources Lab
Dept. of Earth, Atmospheric, and Planetary Sciences
Massachusetts Institute of Technology
42 Carleton Street
Cambridge, MA 02142
Email: toksoz@mit.edu
Award # 1434-HQ-98-AG-01926

Prepared by Susan O'Connor
Email: dannolfo@bc.edu
October, 2001

for
United States Geological Survey
905 National Center
12201 Sunrise Valley Drive
Reston, Virginia 20192

Notice

Network operation supported by the U.S. Geological Survey (USGS), Department of the Interior, under USGS award number 1434-HQ-98-AG-01943 and award number 1434-HQ-98-AG-01926. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.

Quarterly Earthquake Report
January - March, 2000


       

Table of Contents

Introduction

The New England Seismic Network (NESN) is operated collaboratively by the Weston Observatory (WES) of Boston College and the Earth Resources Lab (ERL) of the Massachusetts Institute of Technology. The mission of the NESN is to operate and maintain a regional seismic network with digital recording of seismic ground motions for the following purposes: 1) to determine the location and magnitude of earthquakes in and adjacent to New England and report felt events to public safety agencies, 2) to define the crust and upper mantle structure of the northeastern United States, 3) to derive the source parameters of New England earthquakes, and 4) to estimate the seismic hazard in the area.

This report summarizes the work of the NESN for the period January - March, 2000. It includes a brief summary of the network's equipment and operation, and a short discussion of data management procedures. A list of participating personnel is given in Table 1. There were 8 earthquakes that occurred within or near the network during this reporting period. Phase information for these earthquakes is included in this report.

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Current Network Operation and Status

The New England Seismic Network currently consists of 13 broadband three-component, 4 short-period vertical, and 8 strong-motion stations. The coordinates of the stations are given in Table 2, and maps of the weak- and strong-motion networks are shown in Figures 1 and 2, respectively.

WES operates 12 stations with broadband instruments consisting of Guralp CMG-40T three-component sensors. Ground motions recorded by these sensors are digitized at 100 sps with 16-bit resolution. Additional gain-ranging provides 126 dB dynamic range. These stations are operated in dialup mode with waveform segments of suspected events transmitted in digital mode to Weston Observatory for analysis and archiving. WES is continuing to upgrade its recording stations with 2 more broadband instruments scheduled for installation in 2000. WES also maintains 8 SMA-1 strong-motion instruments in New England.

ERL at MIT currently operates 4 short-period stations, all located within 100 km of Boston. The short- period instruments have 1.0 Hz L4C vertical seismometers. Data recorded by these seismometers is transmitted continuously in analog mode to ERL and digitized (12-bit) into a PC at 50 sps. A data acquisition program on the PC triggers on events detected in the short-period data streams and saves them to a disk for manual analysis. Station WFM also has a new three-component, high dynamic range instrument. The instrument has a CMG-40T sensor and transmits 3-channel, 24-bit data at 100 sps continuously to a central processor (Pentium PC) at ERL. Waveform windows of suspected events are extracted from the data stream, analyzed and archived with the short-period data. WES and ERL record some stations in analog format on helicorders to provide additional data for analysis.

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Seismicity

There were 8 earthquakes that occurred in or adjacent to the NESN during this reporting period. A summary of the location data is given in Table 3. Figure 3 shows the locations of these events. Figure 4 shows the locations of all events since the beginning of network operation in October, 1975.

Table 4 gives the station phase data and detailed hypocenter data for each event listed in Table 3. In addition to NESN data, arrival time and magnitude data sometimes are contributed for seismic stations operated by the Geological Survey of Canada (GSC), the Lamont-Doherty Cooperative Seismographic Network., and the US National Seismic Network. Final locations for this section were computed using the program HYPO78. For regional events (those too far from the NESN to obtain accurate locations and magnitudes) phase data are given for NESN stations, but the entry in Table 3 lists the hypocenter and geographic location information adopted from the authoritative network. Accordingly, the epicenter is plotted on the maps using the entry from Table 3.

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Data Management

Recent event locations are available via FTP at: SEISMOEAGLE.BC.EDU. Waveform data are saved in Nanometrics, ASCII, and SEED formats and are available via SEISMOEAGLE.BC.EDU or through personal contact. Earthquake lists can be fingered at QUAKE@SEISMOEAGLE.BC.EDU. Weston Observatory maintains two web pages with information about local earthquakes: "http://www.bc.edu:80/bc_org/avp/cas/wesobs/" and "http://seismoeagle.bc.edu/". The latter page is still under contruction. Currently available on the seismoeagle web page is the full catalog of northeastern U.S. earthquake activity to 1992. This will be updated as new Northeastern U.S. Seismic Network Bulletins are produced.

MIT/ERL provides two internet utilities, the MIT/ERL web-site ("www-erl.mit.edu/NESN/homepage.html") and an anonymous FTP directory, to distribute seismic data. SESAME (Seismic Event Server at MIT/ERL) is the web data server that distributes catalogs, reports, earthquake bulletins, and epicenter and station maps (including an archive of recent seismic events). The FTP site, named "sunda.mit.edu", is the current facility available to download waveform data recorded by the MIT NESN. The client machine IP number must be forwarded to us for the client to gain access to the anonymous FTP directory. After logging on, the user changes directories to "pub/seismic". Waveforms of individual events for the period April 1995 through the present are accessed as Unix-compressed SAC files, through the anonymous FTP directory. A "readme" file offers further explanation about the data. Older waveform data in SAC format (1981 - March 1995) will be made available on the FTP site upon request.

For more information on matters discussed in this report or general earthquake information (reports, maps, catalogs, etc.) consult our web-sites www-erl.mit.edu/NESN and http://www.bc.edu/westonobservatory or contact:

Robert Cicerone
MIT Earth Resources Lab
42 Carleton Street
Cambridge, MA 02142

Voice: 617-253-7863 / FAX: 617-253-6385 / Email: cicerone@erl.mit.edu

Prof. John Ebel
Weston Observatory
381 Concord Road
Weston, MA 02493

Voice: 617-552-8319 / FAX: 617-552-8388 / Email: ebel@bc.edu

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Explanation of Tables

Table 1: List of personnel operating the NESN

Table 2: List of Seismic and Strong Motion Stations

  1. Code = station name
  2. Lat = station latitude, degrees north
  3. Long = station longitude, degrees west
  4. Elev = station elevation in meters
  5. Location = geographic location
  6. Operator = network operator

Table 3: Earthquake Hypocenter List

  1. Date = date event occurred, Yr (year)/Mo (month)/Dy (day)
  2. Time = origin time of event, Hr (hour):Mn (minute):Sec (second)
    in UCT (Universal Coordinated Time, same as Greenwich Mean Time)
  3. Lat = event location, latitude north in degrees
  4. Long = event location, longitude west in degrees
  5. Depth = event depth in kilometers
  6. Mag = event magnitude
  7. Int = event epicentral intensity
  8. Location = event geographic location

Table 4: Earthquake detailed hypocenter and phase data list

Table Header: detailed hypocenter data

  1. Geographic location
  2. DATE = date event occurred, yr/mo/dy (year/month/day)
  3. ORIGIN = event origin time (UCT) in hours, minutes, and seconds
  4. LAT N = latitude north in degrees and minutes
  5. LONG W = longitude west in degrees and minutes
  6. DEPTH = event depth in kilometers
  7. MN = Nuttli Lg phase magnitude with amplitude divided by period
  8. MC = signal duration (coda) magnitude
    WES: 2.23 Log(FMP) + 0.12Log(Dist) - 2.36 (Rosario, 1979)
    MIT: 2.21 Log(FMP) - 1.7 (Chaplin et al., 1980)
  9. ML = local magnitude
    WES: calculated from Wood-Anderson seismograms (Ebel, 1982)
    GSC (Geological Survey of Canada): Richter Lg magnitude
  10. GAP = largest azimuthal separation, in degrees, between stations
  11. RMS = root mean square error of travel time residual in seconds
  12. ERH = standard error of epicenter in kilometers
  13. ERZ = standard error of event depth in kilometers
  14. Q = solution quality of hypocenter
    A = excellent
    B = good
    C = fair
    D = poor

Table Body: earthquake phase data

  1. STN = station name
  2. DIST = epicentral distance in kilometers
  3. AZM = azimuthal angle in degrees measured clockwise between true north and vector pointing from epicenter to station
  4. Description of onset of phase arrival
    I = impulsive
    E = emergent
  5. R = phase
    P = first P arrival
    S = first S arrival
  6. M = first motion direction of phase arrival
    U = up or compression
    D = down or dilatation
  7. K = weight of arrival
    0 = full weight (1.0)
    1 = 0.75 weight
    2 = 0.50 weight
    3 = 0.25 weight
    4 = no weight (0.0)
  8. HRMN = hour and minute of phase arrival
  9. SEC = second of phase arrival
  10. TCAL = calculated travel time of phase in seconds
  11. RES = travel time residual (error) of phase arrival
  12. WT = weight of phase used in hypocentral solution
  13. AMX = peak-to-peak ground motion, in millimicrons, of the maximum envelope amplitude of vertical-component signal, corrected for system response
  14. PRX = period in seconds of the signal from which amplitude was measured
  15. XMAG = Nuttli magnitude recorded at station
  16. FMP = signal duration (coda), in seconds, measured from first P arrival
  17. FMAG = coda magnitude recorded at station

Table 5: Microearthquakes and other non-locatable events

  1. Date = date event occurred, Yr (year)/Mo (month)/Dy (day)
  2. Sta = nearest station recording event
  3. Arrival Time = phase arrival time, Hr (hour):Mn (minute):Sec (second)

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TABLE 1



       

WESTON OBSERVATORY PERSONNEL


Name Network Position voice phone email address
John E. Ebel Principal Investigator 617-552-8319 ebel@bc.edu
Alan Kafka Research Seismologist 617-552-8300 kafka@bcvms.bc.edu
Susan O'Connor Seismic Analyst 617-552-8337 dannolfo@bc.edu
Edward Johnson Project Engineer 617-552-8332 johnson@bcvms.bc.edu
Patricia Tassia Administrative Secretary 617-552-8311 tassia@bcvms.bc.edu
W. Richard Ott, S.J. Assistant to the Director 617-552-8335 ottwi@mail1.bc.edu
Weston Observatory
617-552-8300
617-552-8388 (FAX)



       

MIT/ERL PERSONNEL


Name

Network Position voice phone email address
M. Nafi Toksöz Principal Investigator 617-253-7852 toksoz@mit.edu
Robert Cicerone Research Seismologist 617-253-7863 cicerone@erl.mit.edu
Heather Hooper Seismic Analyst 617-253-6290
Sara Brydges Administrator 617-253-7797 sara@erl.mit.edu
Earth Resources Lab
617-253-8027
617-253-6385 (FAX)



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TABLE 2



       

SEISMIC STATIONS OF THE NEW ENGLAND SEISMIC NETWORK


Code Lat Long Elev (m) Location Operator
BCX 42.3350 -71.1705 61.0 Chestnut Hill, MA WES
BRY 41.9178 -71.5388 380.0 Smithfield, RI WES
DNH 43.1225 -70.8948 24.0 Durham, NH MIT
DXB 42.0610 -70.6992 8.0 Duxbury, MA MIT
GLO 42.6403 -70.7272 15.2 Gloucester, MA MIT
HNH 43.7050 -72.2860 180.0 Hanover, NH WES
MIM 45.2436 -69.0403 140.0 Milo, ME WES
NH1 43.5473 -71.5743 402.0 Sanbornton, NH WES
QUA2 42.2789 -72.3525 168.0 Belchertown, MA WES
TRY 42.7311 -73.6669 131.0 Troy, NY WES
VT1 44.3317 -72.7536 410.0 Waterbury, VT WES
WES 42.3850 -71.3220 60.0 Weston, MA WES
WFM 42.6106 -71.4906 87.5 Westford, MA MIT
WVL 44.5648 -69.6575 85.0 Waterville, ME WES
YLE 41.3100 -72.9269 914.0 New Haven, CT WES
PQI 46.6710 -68.0168 175.0 Presque Isle, ME WES

       

STRONG MOTION STATIONS OF THE NEW ENGLAND SEISMIC NETWORK


Code Lat Long Location Operator
SM1 44.90 -67.25 Dennysville, ME WES
SM2 44.49 -73.10 Essex Junction, VT WES
SM3 41.45 -71.33 Newport, RI WES
SM4 42.38 -71.32 Weston, MA WES
SM5 42.66 -71.30 Lowell, MA WES
SM6 42.30 -71.34 Natick, MA WES
SM7 42.39 -71.54 Hudson, MA WES
SM8 44.48 -69.61 North Vassalboro, ME WES

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TABLE 3



       

EARTHQUAKE HYPOCENTER LIST
NEW ENGLAND AND ADJACENT REGIONS
January - March, 2000


Date
Yr/Mo/Dy
Time
Hr:Mn:Sec
Lat Long Depth
(km)
Mag Int Location
2000/01/01 11:23:03.00 47.0270 -78.1698 5.00 4.8
PQ, TEMISCAMINGUE
2000/01/03 21:05:50.01 44.3145 -70.1722 9.69 3.4
ME, 18 KM S OF LIVERMORE FALLS
2000/01/17 08:16:20.40 44.5692 -70.4422 16.28 3.4
ME, 3.5 KM NNE OF DIXFIELD
2000/01/21 05:59:49.69 42.9908 -71.1773 1.65 2.4
NH, 4.5 KM S OF RAYMOND
2000/01/27 14:49:40.50 43.0000 -71.1815 1.40 3.0
NH, 3.5 KM S OF RAYMOND
2000/01/27 15:07:43.15 43.0195 -71.2615 8.18 2.2
NH, 3 KM SSW OF RAYMOND
2000/01/27 15:30:06.39 43.0213 -71.2673 6.19 2.2
NH, 7.5 KM ESE OF RAYMOND
2000/01/27 16:43:47.22 43.0193 -71.0692 7.70 1.8
NH, 5 KM WSW OF RAYMOND

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TABLE 4

EARTHQUAKE PHASE DATA LIST
NEW ENGLAND AND ADJACENT REGIONS
January - March, 2000

 NORTHWEST MAINE CRUSTAL STRUCTURE
 00JAN01 PQ, TEMISCAMINGUE REGION

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 000101 1123  3.00 47- 1.62  78-10.19   5.00  4.8         304  0.18 50.8 41.1 D

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  GRQ 182.4 105  P 4 1123 33.30  30.30  28.98  1.31 0.00
  OTT 262.4 134  P 4 1123 40.87  37.87  38.85 -0.99 0.00
                 S 0 1123 72.22  69.22  69.15  0.06 2.18
  TRQ 291.0 108  P 4 1123 45.86  42.86  42.39  0.46 0.00
  WBO 317.9 135  P 4 1123 47.12  44.12  45.70 -1.59 0.00
                 S 0 1123 84.22  81.22  81.35 -0.14 1.76
  MNT 389.1 116  P 0 1123 57.37  54.37  54.50 -0.14 1.22
  DPQ 412.7  95  P 0 1123 60.56  57.56  57.41  0.14 1.04
  MOQ 494.8 113  P 0 1124 10.59  67.59  67.55 -0.10 0.42
  VT1 517.4 125 EP 0 1124 14.11  71.11  70.34  0.75 0.25
                ES 0 1124 95.26 152.26 125.20 27.02 0.00
  DAQ 532.2  79  P 0 1124 15.26  72.26  72.17 -0.07 0.13
  A54 589.7  85  P 0 1124 21.42  78.42  79.27 -0.91 0.00
  HNH 590.4 129 EPC0 1124 21.83  78.83  79.35 -0.55 0.003218 .47  4.8
  A21 644.5  83  P 0 1124 28.39  85.39  86.03 -0.65 0.00
 QUA2 700.7 139 EPC0 1124 34.75  91.75  92.97 -1.26 0.002682 .42  5.0
  WVL 717.0 113 EP 0 1124 38.60  95.60  94.98  0.61 0.002381 .58  4.8
  WES 748.8 134 EP 0 1124 40.30  97.30  98.91 -1.63 0.001764 .58  4.7
  BCX 761.4 133 EPC0 1124 41.53  98.53 100.46 -1.93 0.001791 .63  4.7
  BRY 774.9 137 EPC0 1124 43.74 100.74 102.12 -1.39 0.001634 .54  4.8
  PQI 776.1  93 EP 0 1124 45.12 102.12 102.28 -0.19 0.002491 .62  4.9
  CNQ 792.0  71  P 4 1124 46.19 103.19 104.24 -1.08 0.00
  MNQ 792.9  61  P 4 1124 46.77 103.77 104.35 -0.58 0.00
  GSQ 851.6  76  P 0 1124 53.82 110.82 111.60 -0.79 0.00
  ICQ 854.8  71  P 0 1124 53.51 110.51 112.00 -1.50 0.00
  SMQ 917.5  67  P 4 1124 61.16 118.16 119.73 -1.63 0.00

NORTHWEST MAINE CRUSTAL STRUCTURE
 00JAN03 ME, 18 KM S OF LIVERMORE FALLS

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
    103 21 5 50.01 44-18.87  70-10.33   9.69  3.4 3.4     126  0.38  1.1  1.2 C

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  WVL  46.9  59 IPD0 21 5 57.89   7.88   7.79  0.09 2.22
                ES 0 21 5 63.74  13.73  13.86 -0.14 2.22
 LBNH 140.2 267 EP 0 21 6 12.30  22.29  22.58 -0.34 1.79
  DNH 144.7 204 EP 0 21 6 13.94  23.93  23.29  0.64 1.73              279  3.4
                ES 0 21 6 31.10  41.09  41.46 -0.37 1.77
  HNH 182.5 248 EP 0 21 6 19.10  29.09  28.52  0.54 1.60 637 .13  3.5
                ES 3 21 6 40.22  50.21  50.77 -0.61 0.39
  GLO 191.3 194 EP 1 21 6 19.70  29.69  29.61  0.09 1.19              225  3.3
                ES 4 21 6 41.94  51.93  52.70 -0.77 0.00
  MOQ 198.6 304 EP 0 21 6 20.90  30.89  30.50  0.25 1.55
  VT1 206.0 271 EP 4 21 6 23.60  33.59  31.42  2.15 0.00
                ES 0 21 6 46.09  56.08  55.93  0.12 1.52
  WFM 217.3 209 EP 0 21 6 23.14  33.13  32.81  0.31 1.47              238  3.3
                ES 0 21 6 48.16  58.15  58.40 -0.27 1.47
  WES 233.8 204 EP 0 21 6 24.90  34.89  34.85  0.03 1.39 130 .10  3.2
                ES 2 21 6 55.35  65.34  62.04  3.29 0.00
  BCX 234.4 200 EP 0 21 6 24.56  34.55  34.92 -0.37 1.38 386 .28  3.3
                ES 4 21 6 56.75  66.74  62.16  4.59 0.00
  BRY 288.6 203 EP 4 21 6 38.03  48.02  41.61  6.41 0.00 210 .23  3.3
                ES 4 21 6 71.04  81.03  74.07  6.96 0.00
  MNT 302.9 296 EP 4 21 6 35.91  45.90  43.38  2.53 0.00
  PQI 311.4  33 EP 0 21 6 34.55  44.54  44.43  0.08 1.05 305 .22  3.5
                ES 4 21 6 75.76  85.75  79.09  6.61 0.00
  A11 325.5 360 EP 0 21 6 36.69  46.68  46.17  0.51 0.98
                ES 0 21 6 72.79  82.78  82.18  0.59 0.97
  DPQ 332.5 322 EP 0 21 6 36.97  46.96  47.04 -0.08 0.96
                 S 4 21 6 70.87  80.86  83.74 -2.87 0.00
  A54 349.8 357  P 0 21 6 39.02  49.01  49.17 -0.22 0.88
                 S 0 21 6 77.41  87.40  87.53 -0.23 0.88
  A16 350.7   2  P 0 21 6 39.37  49.36  49.29  0.07 0.88
                 S 0 21 6 76.97  86.96  87.73 -0.77 0.81
  LMQ 359.6 358  P 0 21 6 40.23  50.22  50.39 -0.23 0.84
                 S 0 21 6 80.23  90.22  89.69  0.41 0.83
  A61 375.7   1  P 0 21 6 42.03  52.02  52.36 -0.35 0.76
                 S 0 21 6 83.57  93.56  93.21  0.34 0.77
  A21 378.6   6  P 0 21 6 42.68  52.67  52.72 -0.05 0.76
                 S 0 21 6 83.35  93.34  93.85 -0.50 0.74
  A64 391.0   3  P 0 21 6 43.80  53.79  54.26 -0.49 0.69
                 S 3 21 6 85.30  95.29  96.59 -1.33 0.11
  TRQ 403.9 302  P 0 21 6 44.99  54.98  55.85 -0.87 0.58
                 S 3 21 6 87.65  97.64  99.42 -1.78 0.02
  WBO 411.6 281  P 0 21 6 47.30  57.29  56.80  0.49 0.60
  DAQ 414.0 348  P 0 21 6 47.52  57.51  57.10  0.25 0.60
  GAC 446.0 290  P 0 21 6 51.29  61.28  61.04  0.24 0.46
                 S 4 21 6 95.77 105.76 108.66 -2.89 0.00
  OTT 454.0 285  P 4 21 6 59.09  69.08  62.04  7.04 0.00
  LMN 455.6  68  P 3 21 6 51.80  61.79  62.24 -0.45 0.10
  GRQ 512.4 300  P 3 21 6 60.11  70.10  69.24  0.86 0.04
  GSQ 562.6  25  P 0 21 6 65.92  75.91  75.44  0.46 0.00
  CNQ 577.2  16  P 0 21 6 67.06  77.05  77.24 -0.22 0.00
  ICQ 619.6  21  P 0 21 6 72.10  82.09  82.49 -0.40 0.00
  MNQ 699.0   9  P 0 21 6 81.56  91.55  92.29 -0.74 0.00
  SMQ 707.3  22  P 0 21 6 83.06  93.05  93.31 -0.31 0.00
  EEO 742.2 290  P 0 21 6 87.70  97.69  97.62  0.08 0.00

NORTHWEST MAINE CRUSTAL STRUCTURE
 00JAN17 ME, 3.5 KM NNE OF DIXFIELD

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 000117  816 20.40 44-34.15  70-26.53  16.28  3.4 3.3      90  0.50  1.3  1.8 C

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  WVL  61.8  94 IPC0  816 30.59  10.19  10.31 -0.13 2.40 846 .13  3.0 223  3.1
                ES 1  816 38.22  17.82  18.35 -0.55 1.74
 LBNH 123.7 253 EPD3  816 39.13  18.73  19.99 -1.32 0.29
                ES 4  816 51.86  31.46  35.58 -4.23 0.00
  DNH 164.8 193 EP 0  816 46.68  26.28  25.68  0.60 1.81              252  3.4
                 S 0  816 65.30  44.90  45.71 -0.81 1.76
  HNH 176.1 237 EPD0  816 47.73  27.33  27.07  0.23 1.84 760 .24  3.4 264  3.4
                ES 2  816 67.86  47.46  48.18 -0.78 0.85
  VT1 185.7 262 EP 1  816 49.43  29.03  28.26  0.75 1.24
                ES 1  816 70.90  50.50  50.30  0.16 1.34
  GLO 215.6 186 EP 0  816 53.00  32.60  31.94  0.66 1.56              161  3.0
                 S 0  816 77.30  56.90  56.85  0.04 1.65
  WFM 233.5 201 EP 0  816 55.04  34.64  34.16  0.47 1.52              237  3.4
                 S 0  816 80.60  60.20  60.80 -0.62 1.51
  WES 252.9 196 EP 1  816 57.44  37.04  36.55  0.47 1.07 664 .37  3.5 227  3.3
                ES 4  816 83.50  63.10  65.06 -1.98 0.00
  BCX 255.1 193 EP 4  816 59.25  38.85  36.82  2.02 0.00 329 .19  3.4 190  3.2
                ES 1  816 86.43  66.03  65.54  0.48 1.07
  MNT 271.4 292  P 1  816 59.61  39.21  38.84  0.37 1.02
  DXB 279.4 184 EP 0  816 60.00  39.60  39.83 -0.23 1.33              184  3.2
                 S 0  816 90.74  70.34  70.89 -0.55 1.29
  DPQ 297.1 322  P 1  817  1.64  41.24  42.01 -0.77 0.86
                 S 3  817 33.79  73.39  74.77 -1.39 0.15
  A11 297.7   4  P 3  817  3.36  42.96  42.09  0.86 0.28
                 S 4  817 32.17  71.77  74.92 -3.17 0.00
  BRY 307.7 197 EPC0  817  4.20  43.80  43.32  0.48 1.17 334 .17  3.6 224  3.4
                 S 4  817 44.17  83.77  77.11  6.65 0.00
  A54 321.0   0  P 1  817  5.70  45.30  44.96  0.28 0.84
                 S 0  817 40.67  80.27  80.03  0.13 1.13
  LMQ 331.3   2  P 0  817  6.88  46.48  46.23  0.18 1.08
                 S 0  817 42.53  82.13  82.28 -0.28 1.08
  A61 348.4   4  P 1  817  8.99  48.59  48.34  0.24 0.74
  A21 353.2   9  P 1  817  9.71  49.31  48.94  0.37 0.72
  A64 364.6   7  P 0  817 10.37  49.97  50.34 -0.40 0.90
                 S 4  817 52.28  91.88  89.61  2.23 0.00
  TRQ 370.8 300  P 4  817  8.62  48.22  51.10 -2.89 0.00
                 S 0  817 51.17  90.77  90.97 -0.20 0.88
  DAQ 382.4 351  P 1  817 13.76  53.36  52.54  0.66 0.59
                 S 3  817 52.58  92.18  93.52 -1.62 0.05
  WBO 385.4 277  P 0  817 12.79  52.39  52.91 -0.52 0.79
                 S 4  817 47.65  87.25  94.18 -6.93 0.00
  GAC 416.0 288  P 0  817 16.78  56.38  56.68 -0.31 0.66
                 S 3  817 59.32  98.92 100.90 -1.98 0.00
  OTT 425.8 282  P 0  817 18.09  57.69  57.90 -0.21 0.61
  LMN 465.2  72  P 0  817 23.28  62.88  62.77  0.11 0.42
                 S 0  817 72.73 112.33 111.72  0.60 0.40
  GRQ 479.6 298  P 0  817 24.67  64.27  64.54 -0.27 0.35
                 S 3  817 73.24 112.84 114.87 -2.04 0.00
  GSQ 546.1  28  P 3  817 34.14  73.74  72.75  0.97 0.00
                 S 0  817 89.49 129.09 129.50 -0.43 0.02
  CNQ 556.2  19  P 0  817 34.29  73.89  74.00 -0.15 0.00
                 S 4  817 89.29 128.89 131.72 -2.89 0.00
  ICQ 601.1  24  P 0  817 39.74  79.34  79.54 -0.21 0.00
                 S 4  817 99.33 138.93 141.57 -2.66 0.00
  MNQ 674.7  11  P 0  817 48.95  88.55  88.62 -0.07 0.00
  SMQ 689.0  24  P 0  817 50.47  90.07  90.39 -0.38 0.00
  EEO 711.7 289  P 0  817 52.98  92.58  93.20 -0.62 0.00

SOUTHEAST MAINE CRUSTAL MODEL
 00JAN21 NH, 4.5 KM S OF RAYMOND

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 000121  559 49.69 42-59.45  71-10.64   1.65  2.4 2.5      81  0.50  1.4  4.7 D

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  DNH  27.3  58 EP 0  559 54.12   4.43   4.60 -0.18 1.46              122  2.5
                 S 1  559 57.28   7.59   8.19 -0.61 1.06
  WFM  49.4 211 EP 0  559 57.84   8.15   8.24 -0.10 1.40              109  2.5
                 S 0  559 64.32  14.63  14.67 -0.06 1.40
  GLO  53.6 137 EP 0  559 58.84   9.15   8.91  0.24 1.39              128  2.6
                 S 0  559 65.42  15.73  15.85 -0.13 1.39
  WES  68.4 190 IPD0  559 61.09  11.40  11.25  0.14 1.35 295 .24  2.5  85  2.3
                ES 1  559 69.08  19.39  20.03 -0.66 0.97
  BCX  72.9 180 EP 4  559 64.18  14.49  11.96  2.52 0.00 129 .16  2.2
                ES 3  559 72.89  23.20  21.29  1.90 0.03
  DXB 110.5 159 EP 1  559 68.86  19.17  17.94  1.22 0.67              106  2.6
                 S 1  559 81.14  31.45  31.94 -0.49 0.90
  HNH 119.9 311 EP 0  559 69.52  19.83  19.44  0.36 1.19 113 .15  2.5  80  2.3
                ES 2  559 83.09  33.40  34.60 -1.25 0.40
  BRY 122.8 194 EPD0  559 70.08  20.39  19.89  0.49 1.18 170 .14  2.7
                ES 1  559 84.41  34.72  35.41 -0.70 0.85
 QUA2 124.7 231 EPC0  559 70.40  20.71  20.20  0.48 1.18 126 .19  2.5
                ES 1  559 85.11  35.42  35.95 -0.59 0.86
 LBNH 151.4 336 EP 0  559 74.30  24.61  24.43  0.12 1.11
  VT1 195.8 320 EPC4  559 82.01  32.32  30.31  1.99 0.00
  WVL 209.8  35 EP 1  559 82.60  32.91  32.04  0.86 0.66  40 .22  2.3   0  2.6
  MOQ 271.9 342  P 1  559 90.13  40.44  39.70  0.59 0.56

HUGHES AND LUETGERT NH
 00JAN27 NH, 3.5 KM S OF RAYMOND

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 000127 1449 40.50 43- 0.03  71-10.89   1.40  3.0 2.6     101  0.15  0.7  1.1 B

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  WFM  50.2 210 EP 0 1449 48.96   8.46   8.57 -0.12 1.84              121  2.6
                 S 4 1449 54.46  13.96  15.25 -1.31 0.00
  GLO  54.6 137 EP 0 1449 49.92   9.42   9.32  0.10 1.84
                 S 4 1449 56.58  16.08  16.59 -0.51 0.00
  NH1  68.6 332 EPC0 1449 51.98  11.48  11.69 -0.21 1.71 419 .14  2.7
                 S 4 1449 59.52  19.02  20.82 -1.80 0.00
  WES  69.4 190 IPD0 1449 52.26  11.76  11.82 -0.07 1.78 648 .24  2.9
                 S 4 1449 60.31  19.81  21.04 -1.25 0.00
  BCX  73.9 179 EPC4 1449 56.75  16.25  12.56  3.69 0.00 689 .28  2.9
                 S 4 1449 65.58  25.08  22.36  2.72 0.00
  DXB 111.6 159 EP 0 1449 59.22  18.72  18.69  0.03 1.63              107  2.6
                 S 4 1449 71.76  31.26  33.28 -2.01 0.00
  HNH 118.9 311 EPC0 1449 60.67  20.17  19.87  0.27 1.46 450 .26  3.0
                 S 4 1449 73.86  33.36  35.37 -2.06 0.00
  BRY 123.8 194 EPC0 1449 61.13  20.63  20.67 -0.04 1.58 922 .19  3.3
                 S 4 1449 77.71  37.21  36.79  0.42 0.00
 QUA2 125.2 230 IPC0 1449 61.53  21.03  20.89  0.11 1.561166 .33  3.4
                 S 4 1449 76.00  35.50  37.19 -1.74 0.00
  VT1 194.8 319 EPC4 1449 73.49  32.99  31.21  1.76 0.00
                 S 4 1449 95.86  55.36  55.55 -0.22 0.00
  WVL 209.2  36 EPD0 1449 73.44  32.94  32.98 -0.05 1.26 214 .22  3.0
                 S 4 1449 97.31  56.81  58.71 -1.91 0.00
  MOQ 270.8 342  P 0 1450 21.14  40.64  40.59 -0.09 1.04
                 S 4 1450 50.97  70.47  72.25 -2.03 0.00
  MNT 339.5 325  P 0 1450 29.95  49.45  49.07  0.38 0.57
  WBO 396.5 304  P 0 1450 36.51  56.01  56.11 -0.09 0.57
                 S 4 1450 78.81  98.31  99.87 -1.56 0.00
  DPQ 428.0 343  P 0 1450 40.44  59.94  60.00 -0.06 0.45
  TRQ 447.2 323  P 0 1450 42.75  62.25  62.36 -0.11 0.38
  A11 477.7   9  P 0 1450 47.04  66.54  66.14  0.39 0.19
  A54 498.9   7  P 0 1450 48.81  68.31  68.76 -0.50 0.06
                 S 4 1450 99.96 119.46 122.38 -3.03 0.00
  LMQ 509.8   8  P 0 1450 50.13  69.63  70.10 -0.54 0.03
  A21 535.6  13  P 0 1450 53.78  73.28  73.28  0.00 0.05
  GRQ 545.6 317  P 0 1450 57.21  76.71  74.51  2.20 0.00
  DAQ 551.7 360  P 0 1450 55.45  74.95  75.27 -0.48 0.00
  LMN 598.6  58  P 0 1450 60.53  80.03  81.07 -1.03 0.00

SOUTH & COASTAL NEW ENGLAND, CHIBURIS, 1979
 00JAN27 NH, 3 KM SSW OF RAYMOND

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 000127 15 7 43.15 43- 1.17  71-15.69   8.18  2.2 2.1     137  0.47  2.2  2.8 C

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  NH1  63.9 337 EP 3 15 7 55.48  12.33  10.69  1.64 0.12  62 .11  1.9
                 S 2 15 7 61.92  18.77  19.03 -0.26 0.94
  WES  70.7 184 EP 2 15 7 54.21  11.06  11.81 -0.76 0.86               70  2.1
                 S 4 15 7 61.81  18.66  21.02 -2.38 0.00
  BCX  76.4 174 EP 4 15 7 58.47  15.32  12.75  2.57 0.00 108 .18  2.2
                 S 3 15 7 66.60  23.45  22.69  0.76 0.44
  HNH 112.6 313 EP 2 15 7 62.30  19.15  18.30  0.82 0.79 111 .18  2.4
                 S 2 15 7 75.33  32.18  32.57 -0.44 0.84
 QUA2 121.6 227 EPC0 15 7 62.98  19.83  19.66  0.14 1.68  64 .17  2.2
                 S 0 15 7 78.51  35.36  35.00  0.31 1.68
  BRY 124.5 191  S 0 15 7 78.60  35.45  35.77 -0.32 1.65 138 .19  2.5
  VT1 189.0 320 EP 4 15 7 48.78   5.63  29.13-23.52 0.00
                 S 4 15 7 61.46  18.31  51.85-33.57 0.00
  WVL 211.3  37 EP 4 15 7 71.14  27.99  31.88 -3.90 0.00  12 .14  1.9
                 S 1 15 7 99.77  56.62  56.75 -0.14 1.00

HUGHES AND LUETGERT NH
 00JAN27 NH, 7.5 KM ESE OF RAYMOND

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 000127 1530  6.39 43- 1.28  71-16.04   6.19  2.2 2.4     137  0.48  2.3  4.2 C

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  WFM  49.2 202 EP 1 1530 14.60   8.21   8.31 -0.11 1.46
                 S 3 1530 20.75  14.36  14.80 -0.45 0.48
  NH1  63.5 337 EPC4 1530  8.56   2.17  10.65 -8.48 0.00
                 S 0 1530 25.08  18.69  18.96 -0.27 1.89
  WES  70.9 184 EP 1 1530 18.00  11.61  11.84 -0.24 1.39  95 .18  2.1  96  2.4
                 S 4 1530 26.03  19.64  21.08 -1.46 0.00
  BCX  76.7 174 EP 4 1530 22.56  16.17  12.78  3.39 0.00  68 .11  2.0
                 S 3 1530 31.50  25.11  22.76  2.35 0.07
  HNH 112.2 313 EP 4 1530 26.72  20.33  18.55  1.75 0.00  40 .12  2.0  89  2.4
                 S 1 1530 39.63  33.24  33.02  0.16 1.27
 QUA2 121.3 227 EPC1 1530 27.20  20.81  19.97  0.81 1.21 123 .33  2.4
                 S 1 1530 41.61  35.22  35.54 -0.38 1.25
  BRY 124.6 190 EP 0 1530 27.31  20.92  20.48  0.44 1.63 111 .18  2.4  94  2.5
                 S 3 1530 41.55  35.16  36.45 -1.29 0.36
  WVL 211.4  38 EP 1 1530 39.24  32.85  32.70  0.13 0.98
                 S 3 1530 61.98  55.59  58.21 -2.64 0.01

HUGHES AND LUETGERT NH
 00JAN27 NH, 5 KM WSW OF RAYMOND

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 000127 1643 47.22 43- 1.16  71-14.15   7.70  1.8 2.0     211  0.41  3.2  4.1 C

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  WFM  50.0 205 EP 0 1643 56.03   8.81   8.45  0.35 1.43
                 S 0 1643 62.23  15.01  15.05 -0.06 1.45
  NH1  64.8 335 EP 4 1643 52.54   5.32  10.86 -5.54 0.00  28 .12  1.5
                 S 0 1643 66.16  18.94  19.34 -0.40 1.39
  WES  70.9 186 EP 0 1643 58.97  11.75  11.85 -0.11 1.39  34 .16  1.6  64  2.1
                 S 3 1643 67.08  19.86  21.10 -1.25 0.15
  BCX  76.2 176 EP 4 1643 57.00   9.78  12.72 -2.94 0.00  22 .12  1.5
                 S 4 1643 72.79  25.57  22.65  2.92 0.00
  HNH 114.2 312 EP 3 1643 67.52  20.30  18.79  1.48 0.06  24 .13  1.8  50  2.0
                 S 0 1643 80.63  33.41  33.45 -0.10 1.26
 QUA2 123.2 228 EPC1 1643 68.22  21.00  20.18  0.79 0.83  74 .26  2.2
                 S 0 1643 83.08  35.86  35.92 -0.12 1.24
  BRY 124.9 192 EP 1 1643 68.21  20.99  20.45  0.54 0.90  49 .20  2.1
                 S 1 1643 83.07  35.85  36.39 -0.54 0.90




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TABLE 5



       

MICROEARTHQUAKES AND OTHER NON-LOCATABLE EVENTS


Date
Yr/Mo/Dy
Sta Arrival Time
Hr:Mn:Sec
None recorded this period.


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NESN Station Map

Figure 1: Map of stations of the New England Seismic Network (NESN) in operation during period January - March, 2000. Also included are the US National Seismic Network stations operating in New England during this period.

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NESN Strong-Motion Station Map

Figure 2: Map of strong-motion stations of the New England Seismic Network (NESN) in operation during period January - March, 2000.

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NESN Quarterly Seismicity Map

Figure 3: Earthquake epicenters located by the NESN during period January - March, 2000.

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NESN Cumulative Seismicity Map

Figure 4: Seismicity for period October, 1975 - March, 2000.

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Acknowledgments

We would like to thank the Undergraduate Research Opportunities Program (UROP) of MIT for its support to the network. Our map database has been developed in-house using ARCINFO and in part basemap data provided by ESRI, Inc. (Arcdata Online), USGS GTOPO30 Elevation Data, and TIGER/Line '94, '95, and '97 (US Census Bureau) spatial data.

References

Chaplin, M.P., Taylor, S.R., and Toksöz, M.N. (1980), A coda length magnitude scale for New England, Earthquake Notes, 51, 15-22.

Ebel, J.E. (1982), ML measurements for northeastern United States earthquakes, Bull. Seism. Soc. Am., 72, 1367-1378.

Rosario, M. (1979), A coda duration magnitude scale for the New England Seismic Network, Master's Thesis, Boston College, 82 pp.

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