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A STUDY OF NEW ENGLAND SEISMICITY

Quarterly Earthquake Report

October - December, 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
November, 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
October - December, 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 October - December, 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 6 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 6 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 www.bc.edu:80/bc_org/avp/cas/wesobs/ 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
October - December, 2000

Date
Yr/Mo/Dy
Time
Hr:Mn:Sec
Lat Long Depth
(km)
Mag Int Location
2000/10/06 13:59:05.46 45.0105 -74.0070 7.61 3.3
PQ, SOUTHERN
2000/10/15 23:49:33.03 43.6523 -71.3928 1.05 2.3
NH, 10 KM E OF MERIDETH
2000/10/27 16:37:39.47 43.4740 -71.5003 9.69 1.4
NH, NEAR BELMONT
2000/11/06 12:16:37.45 42.7683 -73.9578 9.73 2.8
NY, 6 KM W OF ROTTERDAM
2000/11/16 19:41:20.80 41.9195 -71.5405 6.09 1.3
RI, NNW OF PROVIDENCE
2000/12/16 06:05:09.13 43.7335 -71.5105 10.24 2.4
NH, CENTER HARBOR REGION
* indicates Mc rather than Mn.

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TABLE 4

EARTHQUAKE PHASE DATA LIST
NEW ENGLAND AND ADJACENT REGIONS
October - December, 2000

 NORTHERN NY AND ADIRONDACKS
 00OCT06 PQ, SOUTHERN

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 001006 1359  5.46 45- 6.32  74- 0.47   7.61  3.3 2.9      62  0.33  0.7  1.4 C

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  BGR  42.2 223  P 4 1359 16.61  11.15   6.67  4.48 0.00
  MNT  53.5  34 EP 1 1359 13.50   8.04   8.38 -0.33 1.54
                ES 1 1359 20.23  14.77  14.91 -0.14 1.56
  PTN  97.2 232  P 2 1359 19.81  14.35  15.00 -0.69 0.83
                 S 3 1359 31.43  25.97  26.71 -0.81 0.38
  WBO 100.4 263 EP 1 1359 20.79  15.33  15.48 -0.15 1.41
                ES 1 1359 33.07  27.61  27.56  0.05 1.41
  TRQ 131.3 341 EP 1 1359 25.30  19.84  20.16 -0.32 1.30
                ES 0 1359 41.60  36.14  35.88  0.26 1.76
  VT1 131.4 131 EP 1 1359 25.89  20.43  20.18  0.23 1.32              158  2.9
                ES 0 1359 41.37  35.91  35.92 -0.05 1.75
  GAC 132.9 300 EP 0 1359 25.99  20.53  20.41  0.12 1.75
  OTT 138.0 283 EP 1 1359 26.58  21.12  21.18 -0.06 1.30
                ES 0 1359 43.41  37.95  37.70  0.25 1.73
  MOQ 139.7  81 EP 0 1359 26.88  21.42  21.44 -0.16 1.72
                ES 2 1359 44.50  39.04  38.16  0.63 0.80
 LBNH 191.0 120 EP 0 1359 34.78  29.32  29.14  0.12 1.51
                ES 1 1359 58.07  52.61  51.87  0.64 1.05
  HNH 207.4 139 EPD0 1359 36.86  31.40  31.17  0.20 1.44 898 .41  3.5 142  2.9
                ES 0 1359 60.77  55.31  55.48 -0.22 1.42
  GRQ 220.3 319 EP 2 1359 39.42  33.96  32.75  1.21 0.25
                ES 3 1359 65.91  60.45  58.30  2.15 0.00
  WFM 343.1 144 EP 1 1359 53.25  47.79  47.92 -0.14 0.65
                ES 4 1359 80.79  75.33  85.30 -9.99 0.00
  WVL 349.4 101 EP 4 1359 61.55  56.09  48.70  7.39 0.00  88 .20  3.1   0  2.9
  WES 371.8 144 EP 2 1359 56.49  51.03  51.47 -0.44 0.36  68 .20  3.1   0  3.0
  A11 378.0  51  P 1 1359 57.71  52.25  52.23  0.01 0.54
  A54 380.8  47 EP 2 1359 57.63  52.17  52.58 -0.47 0.34
  DAQ 382.2  34 EP 3 1359 57.37  51.91  52.75 -1.00 0.10
 LSCT 386.0 171 EP 1 1359 59.56  54.10  53.21  0.84 0.43
  LMQ 392.7  46 EP 2 1359 59.18  53.72  54.04 -0.38 0.32
                ES 4 1359 53.03  47.57  96.18-48.74 0.00
  BRY 406.6 151                                           61 .19  3.1
  A61 416.5  46 EP 1 1359 62.29  56.83  56.98 -0.16 0.42
  EEO 428.6 293 EP 1 1359 63.86  58.40  58.47 -0.07 0.38
  YLE 430.7 168 EP 4 1359 61.46  56.00  58.73 -2.73 0.00 162 .27  3.5
  A64 437.5  46 EP 2 1359 64.64  59.18  59.57 -0.41 0.23
  EFO 480.0 242 EP 3 1359 68.73  63.27  64.82 -1.55 0.00

 NORTHWEST MAINE CRUSTAL STRUCTURE
 00OCT15 NH, 10 KM E OF MEREDITH

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 001015 2349 33.03 43-39.14  71-23.57   1.05  2.3 2.5      91  0.51  1.4  3.2 D

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  DNH  71.4 146 EP00 2349 44.96  11.93  11.86  0.07 2.35              135  2.7
                 S 1 2349 53.72  20.69  21.10 -0.41 1.75
  HNH  72.2 275 IPD1 2349 45.11  12.08  11.99  0.06 1.76  91 .09  2.1  66  2.1
                ES 2 2349 53.96  20.93  21.34 -0.47 1.16
 LBNH  78.1 327 IPD3 2349 45.49  12.46  12.93 -0.53 0.57              174  2.9
                ES 4 2349 54.59  21.56  23.01 -1.56 0.00
  WFM 116.0 184 IPU2 2349 52.77  19.74  18.94  0.79 1.02              136  2.8
                IS 0 2349 66.67  33.64  33.72 -0.10 2.13
  GLO 124.8 154 EP01 2349 53.88  20.85  20.34  0.51 1.55              136  2.8
                 S 1 2349 68.94  35.91  36.20 -0.29 1.57
  VT1 132.7 305 EP 0 2349 55.23  22.20  21.59  0.59 2.01 358 .15  3.0
                ES 3 2349 70.19  37.16  38.44 -1.31 0.37
  WES 140.9 178 EP 1 2349 56.27  23.24  22.90  0.33 1.51  43 .12  2.2
                ES 2 2349 72.74  39.71  40.76 -1.07 0.88
  WVL 169.2  55 EP 1 2350  0.47  27.44  27.38  0.05 1.40  24 .12  2.1  40  2.0
                ES 4 2350 19.64  46.61  48.74 -2.15 0.00
 QUA2 171.5 207 EP 1 2350  0.25  27.22  27.75 -0.56 1.37  29 .08  2.3
                ES 3 2350 20.56  47.53  49.39 -1.91 0.09
  BRY 193.1 184 EP 3 2350  4.86  31.83  30.74  1.09 0.38               29  1.9
                ES 2 2350 28.36  55.33  54.71  0.62 0.85
  MOQ 196.7 340 EP 3 2350  3.84  30.81  31.19 -0.52 0.43
                ES 4 2350 27.03  54.00  55.52 -1.77 0.00
 LSCT 265.7 214 EP 1 2350 12.59  39.56  39.71 -0.20 1.05              177  3.1
                ES 3 2350 45.52  72.49  70.68  1.72 0.13
  MNT 271.4 319 ES 3 2350 47.35  74.32  71.92  2.40 0.00
  WBO 344.1 296 EP 1 2350 22.40  49.37  49.39 -0.02 0.76
                ES 4 2350 83.51 110.48  87.91 22.57 0.00
  TRQ 379.4 319 EP 2 2350 26.53  53.50  53.75 -0.25 0.42
                ES 4 2350 75.18 102.15  95.67  6.48 0.00
  GAC 396.0 305 EP 1 2350 29.62  56.59  55.79  0.80 0.54
                ES 4 2350 81.35 108.32  99.31  9.01 0.00
  A11 409.8  13 EP 1 2350 30.67  57.64  57.50  0.13 0.52
                ES 4 2350 86.90 113.87 102.35 11.50 0.00
  A54 429.8  10 EP 2 2350 32.80  59.77  59.96 -0.25 0.30
                ES 4 2350 92.45 119.42 106.73 12.58 0.00
  LMQ 441.0  11 EP 3 2350 34.05  61.02  61.35 -0.40 0.13
                ES 4 2350 96.68 123.65 109.19 14.33 0.00
  GRQ 481.1 313 ES 4 2351 43.37 130.34 118.01 12.33 0.00
  LMN 575.7  65 EP 2 2350 50.95  77.92  77.98 -0.06 0.00

HUGHES AND LUETGERT NH
  00OCT27 NH, NEAR BELMONT

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 001027 1637 39.47 43-28.44  71-30.02   9.69  1.4         241  0.37 49.7 **** D

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  HNH  68.4 292 EPD3 1637 51.32  11.85  11.47  0.35 0.55   9 .12  1.1
                ES 1 1637 59.78  20.31  20.42 -0.16 1.68
  WES 121.9 173 EPD3 1637 59.46  19.99  19.89  0.10 0.50  24 .22  1.7
                ES 1 1637 74.52  35.05  35.40 -0.36 1.45
 QUA2 149.9 208 EPD2 1638  4.40  24.93  24.23  0.67 0.82   5 .09  1.4
                ESD4 1638 21.58  42.11  43.13 -1.07 0.00
  WVL 188.2  51 EP 4 1637 57.31  17.84  29.46-11.63 0.00
                ES 4 1637 88.41  48.94  52.44 -3.52 0.00

 NORTHERN NY AND ADIRONDACKS
  00NOV06 NY, 6 KM WEST OF ROTTERDAM

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 001106 1216 37.45 42-46.10  73-57.47   9.73  2.8         210  0.46  2.7  2.1 C

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
 LSCT 135.4 153 EP 0 1216 58.11  20.66  20.79 -0.18 1.64
  HNH 171.2  53 EP 0 1217  4.35  26.90  26.22  0.65 1.42 276 .27  3.0
                ES 0 1217 23.92  46.47  46.67 -0.26 1.50
  YLE 183.1 152 EP 3 1217  3.62  26.17  27.98 -1.82 0.05 169 .20  2.9
                ES 0 1217 27.46  50.01  49.81  0.20 1.46
  PAL 196.0 179 EP 0 1217  7.01  29.56  29.57 -0.01 1.40
  VT1 199.2  29 EP 2 1217  6.30  28.85  29.96 -1.14 0.56 322 .13  3.3
                ES 0 1217 30.57  53.12  53.33 -0.25 1.39
  WES 220.5 101 EP 2 1217 10.68  33.23  32.59  0.62 0.63  47 .18  2.5
                ES 1 1217 35.62  58.17  58.02  0.13 0.98
  BRY 220.7 115 EP 2 1217 10.78  33.33  32.62  0.70 0.60  43 .13  2.5
                ES 0 1217 35.76  58.31  58.07  0.24 1.31
  BCX 233.8 102 EP 1 1217 11.16  33.71  34.23 -0.53 0.93  43 .16  2.5
                ES 3 1217 36.79  59.34  60.94 -1.60 0.11

SOUTH & COASTAL NEW ENGLAND, CHIBURIS, 1979
 00NOV16 RI, NNW OF PROVIDENCE

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 001116 1941 20.80 41-55.17  71-32.43   6.09  1.3 1.2     157  0.22  3.8  3.4 C

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  BRY   0.2 143 IP 1 1941 21.73   0.93   1.03 -0.10 1.371156 .29  0.9  44  1.2
                 S 0 1941 22.69   1.89   1.83  0.06 1.83
  WES  54.7  19 EP 4 1941 34.48  13.68   9.15  4.51 0.00  78 .71  1.8
                ES 3 1941 36.40  15.60  16.29 -0.71 0.36
  BCX  55.4  34 EP 4 1941 33.32  12.52   9.26  3.26 0.00  31 .23  1.4
                ES 1 1941 37.47  16.67  16.48  0.18 1.24
 QUA2  78.1 301 EP 3 1941 35.63  14.83  13.00  1.79 0.02   6 .17  1.0
                ES 1 1941 44.02  23.22  23.15  0.02 1.18

 HUGHES AND LUETGERT NH
  00DEC16 NH, CENTER HARBOR REGION

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 001216  6 5  9.13 43-44.01  71-30.63  10.24  2.4 3.0      85  0.60  1.3  1.9 D

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  HNH  62.6 267 IPD1  6 5 20.06  10.93  10.53  0.37 1.76 166 .16  2.2 180  2.9
                ES 2  6 5 27.40  18.27  18.74 -0.53 1.17
 LBNH  65.4 329 IPU0  6 5 20.04  10.91  10.99 -0.14 2.37              226  3.2
                IS 2  6 5 28.07  18.94  19.56 -0.73 1.15
  DNH  84.2 144 EP 1  6 5 23.44  14.31  14.02  0.28 1.72
                ES 1  6 5 33.72  24.59  24.96 -0.38 1.71
  VT1 119.8 304 EPD3  6 5 29.76  20.63  19.54  1.06 0.49 666 .23  3.2
                ES 2  6 5 43.44  34.31  34.79 -0.52 1.08
  WFM 124.8 179 EPU3  6 5 30.52  21.39  20.31  1.07 0.48              164  2.9
                ES 0  6 5 45.27  36.14  36.15 -0.03 2.16
  GLO 137.1 152 EP 2  6 5 32.16  23.03  22.22  0.80 1.01
                ES 1  6 5 49.08  39.95  39.56  0.39 1.57
  WES 150.6 174 EP 3  6 5 34.63  25.50  24.32  1.17 0.44  49 .11  2.3 121  2.7
                ES 1  6 5 52.03  42.90  43.29 -0.41 1.54
  BCX 157.8 170 EP 3  6 5 36.15  27.02  25.43  1.58 0.29  23 .11  2.0
                ES 2  6 5 53.64  44.51  45.27 -0.76 0.98
  WVL 172.1  59 EP 3  6 5 37.92  28.79  27.43  1.35 0.36  38 .13  2.3
                ES 1  6 5 57.30  48.17  48.82 -0.67 1.45
  MOQ 185.1 341 EP 1  6 5 37.90  28.77  29.03 -0.40 1.45
                ES 3  6 5 61.95  52.82  51.68  0.89 0.45
  DXB 197.3 160 EP 3  6 5 40.82  31.69  30.53  1.16 0.40
                ES 3  6 5 62.61  53.48  54.34 -0.87 0.44
  BRY 201.7 181 EP 4  6 5 37.88  28.75  31.08 -2.33 0.00  24 .11  2.3
                ES 3  6 5 63.57  54.44  55.32 -0.89 0.44
  NCB 219.6 277 EP 0  6 5 42.76  33.63  33.28  0.26 1.83              186  3.1
                ES 1  6 5 69.18  60.05  59.25  0.66 1.33
  MNT 258.4 320 EP 3  6 5 45.84  36.71  38.08 -1.37 0.31
                ES 4  6 5 80.50  71.37  67.78  3.59 0.00
 LSCT 268.1 212 EP 1  6 5 48.87  39.74  39.27  0.42 1.24              169  3.1
                ES 4  6 5 77.33  68.20  69.90 -1.79 0.00
  WBO 331.3 295 EP 4  6 5 59.52  50.39  47.08  3.31 0.00
  DPQ 342.3 343 EP 4  6 5 55.42  46.29  48.43 -2.14 0.00
  TRQ 366.2 319 EP 3  6 5 58.90  49.77  51.39 -1.62 0.16
  OTT 381.5 299 ES 4  6 6 51.65 102.52  94.83  7.69 0.00
  GAC 383.2 305 EP 3  6 6  1.47  52.34  53.48 -1.15 0.27
                ES 4  6 6 52.35 103.22  95.20  8.02 0.00
  A54 422.6  12 EP 4  6 6  4.25  55.12  58.35 -3.29 0.00
                ES 4  6 6 50.48 101.35 103.87 -2.63 0.00
  LMQ 434.0  12 EP 4  6 6  6.05  56.92  59.75 -2.90 0.00
                ES 4  6 6 52.30 103.17 106.36 -3.31 0.00
  A61 453.8  14 EP 4  6 6 13.51  64.38  62.21  2.16 0.00
                ES 0  6 6 59.89 110.76 110.73  0.01 1.02
  GRQ 467.7 313 EP 4  6 6 17.30  68.17  63.92  4.25 0.00
                ES 4  6 6 78.24 129.11 113.77 15.33 0.00
  DAQ 470.7   3 EP 1  6 6 13.83  64.70  64.29  0.25 0.72
                ES 3  6 6 62.79 113.66 114.43 -1.06 0.21
  LMN 580.4  66 EP 4  6 6 19.28  70.15  77.83 -7.68 0.00
  EEO 676.4 299 EP 4  6 6 41.81  92.68  89.68  2.99 0.00
  ICQ 720.8  27 ES 4  6 7 55.98 166.85 169.39 -2.56 0.00
  MNQ 783.7  15 EP 4  6 6 52.97 103.84 102.93  0.91 0.00

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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 October - December, 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 October - Decmeber, 2000.

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NESN Quarterly Seismicity Map

Figure 3: Earthquake epicenters located by the NESN during period October - Decmeber, 2000.

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NESN Cumulative Seismicity Map

Figure 4: Seismicity for period October, 1975 - December, 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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