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NESN





A STUDY OF NEW ENGLAND SEISMICITY


Quarterly Earthquake Report



October-December, 2003



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 Observato ry

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 Anastasia Macherides Moulis

Email: macherid@bc.edu

December, 2003

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. Theviews and conclusions contained in this document are those of the authors andshould not be interpreted as necessarily representing the official policies,either expressed or implied, of the U.S. Government.

Quarterly Earthquake Report

October-December, 2003

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 ofthe 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 ofthe NESN for the period October-December, 2003. 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 14 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 now operates 13 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. During the year 2001, two new seismic stations were added to the WES network. Station UMM was placed in northeastern Maine and station FFD was placed in central New Hampshire. Station MIM, in central Maine was dismantled. 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 sensorand 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 at www.bc.edu/westonobservatory. Waveform data are saved in Nanometrics, ASCII, and SEED formats and are available by contacting, Anastasia Macherides Moulis, via email at macherid@bc.edu. Earthquake lists can be found at www.bc.edu/westonobservatory. Currently available on the Weston Observatory web page is the full catalog of northeastern U.S. earthquake activity to 2003. This will be updated as new Northeastern U.S. Seismic Network Quarterly Earthquake Reports 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/westonobservatory or contact:


Robert Cicerone

MITEarth 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 = st ation 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. D ate = 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 se paration, 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 arr ival
    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 arriva l
  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 = sign al 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 = neares t 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@bc.edu
Anastasia Macherides Moulis Seismic Analyst 617-552-8325 macherid@bc.edu
Edward Johnson Project Engineer 617-552-8332 johnson@bc.edu
Dina Smith Assistant to the Director 617-552-8335 dina.smith.1@bc.edu
Weston Observatory
617-552-8300

617-552-8388 (FAX)


   

MIT/ERL PERSONNEL

Principal Invest igator617-253-7863cicerone@erl.mit.eduAdministrator617-253-7797

Name

Network Position voice phone email address
M. Nafi Toksöz 617-253-7852 toksoz@mit.edu
Robert Cicerone Research Seismologist
Heather Hooper Seismic Analyst 617-253-6290
Sara Brydges 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

WESHNH43.7050-72.3525Belchertown, MATroy, NYWESUMMWES42.3850-71.4906Westford, MAMITWESYLEPQI46.6710
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
FFD 43.4702 -71.6533 131.0 Franklin Falls Dam, NH
GLO 42.6403 -70.7272 15.2 Gloucester, MA MIT
-72.2860 180.0 Hanover, NH WES
QUA2 42.2789 168.0 WES
TRY 42.7311 -73.6669 131.0
44.7100 -67.4583 35.0 Machias, ME WES
VT1 44.3317 -72.7536 410.0 Waterbury, VT WES
-71.3220 60.0 Weston, MA WES
WFM 42.6106 87.5
WVL 44.5648 -69.6575 85.0 Waterville, ME
41.3100 -72.9269 10.0 New Haven, CT WES
-68.0168 175.0 Presque Isle, ME WES

   

STRONG MOTION STATIONS OF THE NEW ENGLAND SEISMIC NETWORK

SM2-73.10Newport, RISM4-71.30WESSM742.39-71.54WES
Code Lat Long Location Operator
SM1 44.90 -67.25 Dennysville, ME WES
44.49 Essex Junction, VT WES
SM3 41.45 -71.33 WES
42.38 -71.32 Weston, MA WES
SM5 42.66 Lowell, MA
SM6 42.30 -71.34 Natick, MA WES
Huds on, MA WES
SM8 44.48 -69.61 North Vassalboro, ME

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TABLE 3




   

NEW ENGLAND AND ADJACENT REGIONS

October-December, 2003

Date

M/D/Y
Time

Hr:Mn:Sec
Lat Long Depth

(km)
Mag Int Location
10/1/2003 08:07:56.49 40.5925 -75.1000 00.97 2.4
NJ, 2.4 KM (1.5 MI) N OF MILFORD
10/7/2003 01:32:03.19 41.7315 -71.5707 06.23 1.8
RI, 6 KM (3.73 MI) NW OF WEST WARWICK
10/11/2003 00:10:02.59 47.5515 -69.8977 27.57 2.9
CANADA, 8.25 KM (5.13 MI) WNW OF ST-PASCAL
10/12/2003 08:26:07.84 47.0102 -76.2757 23.81 4.0
CANADA, 14KM NE OF LAC-DESMARAIS
10/15/2003 04:13:15.09 45.0428 -66.9757 20.43 3.1
CANADA, 10 KM SE OF ST. ANDREWS
10/18/2003 16:25:07.46 46.9397 -67.2087 21.70 3.3
CANADA, 41 KM (25.5 MI) ESE OF GRAND FALLS
* indicates Mc rather than Mn.

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TABLE 4

EARTHQUAKE PHASE DATA LIST
NEW ENGLAND AND ADJACENT REGIONS
October-December, 2003

SOUTHEAST MAINE CRUSTAL MODEL
10/01/03 NJ, 2.4 KM (1.5 MI) N OF MILFORD
 DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 31001  8 7 56.49 40-35.55  75- 6.00    .97   .0  .0     151   .26  1.2  1.8 B
 STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
LUPA  23.0 272 EP 0  8 8   .25   3.76   3.89  -.17 1.83
                S 0  8 8  3.21   6.72   6.92  -.27 1.83
 GPD  71.7  49 EP 0  8 8  8.52  12.03  11.81   .16 1.68
                S 2  8 8 17.41  20.92  21.03  -.21  .83
 TBR  95.9  50 EP 0  8 8 12.35  15.86  15.65   .17 1.59
                S 2  8 8 24.13  27.64  27.86  -.29  .78
CPNY  98.8  77 EP 0  8 8 12.62  16.13  16.12   .01 1.58
                S 0  8 8 25.17  28.68  28.69  -.02 1.58
 PAL 110.4  66 EP 0  8 8 14.67  18.18  17.96   .20 1.54
                S 4  8 8 24.07  27.58  31.96 -4.42  .00
ARNY 114.6  46 EP 1  8 8 14.93  18.44  18.62  -.25 1.13
                S 0  8 8 29.78  33.29  33.14   .02 1.53
 MVL 125.1 238 EP 0  8 8 17.27  20.78  20.29   .47 1.44
MANY 125.1  56 EP 2  8 8 16.57  20.08  20.29  -.23  .74
                S 3  8 8 32.13  35.64  36.12  -.52  .34
BINY 192.5 337 EP 3  8 8 28.15  31.66  29.98  1.60  .01
                S 0  8 8 50.25  53.76  53.36   .25 1.25
SDMD 198.3 229 EP 3  8 8 28.50  32.01  30.69  1.32  .05
                S 3  8 8 50.34  53.85  54.63  -.78  .22
SSPA 236.0 271  P 4  8 8 59.21  62.72  35.35 27.34  .00
               ES 4  8 8 32.87  36.38  62.92-26.60  .00
QUA2 296.4  51 EP 4  8 8 43.16  46.67  42.80  3.84  .00
ACCN 332.0  21 EP 3  8 8 45.09  48.60  47.19  1.34  .03
 BRY 332.6  64 EP 3  8 8 45.39  48.90  47.27  1.57  .00
 HRV 364.2  54 EP 3  8 8 48.99  52.50  51.17  1.30  .03
 NCB 382.1  11 EP 4  8 8 52.35  55.86  53.39  2.37  .00
 HNH 416.8  34 EP 4  8 8 57.70  61.21  57.67  3.51  .00
                S 4  8 8 60.49  64.00 102.65-38.71  .00
 FFD 428.6  42 ES 4  8 9 57.06 120.57 105.24 15.29  .00
 LOZ 449.4   5 EP 4  8 9  6.22  69.73  61.69  7.97  .00
SOUTHEAST MAINE CRUSTAL MODEL
10/07/03 RI, 6 KM (3.73 MI) NW OF WEST WARWICK
 DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 31007  132  3.19 41-43.89  71-34.24   6.23  1.8  .0     297   .48  5.0  3.7 D
 STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
 BRY  20.9   7 EPC1  132  6.66   3.47   3.59  -.19 1.61
               ES 3  132  9.27   6.08   6.40  -.42  .53
 BCX  74.8  26 EPD4  132 18.26  15.07  12.13  2.91  .00  50 .20  1.8
               ES 4  132 27.36  24.17  21.59  2.52  .00
 WES  75.4  16 EPD1  132 15.27  12.08  12.23  -.16 1.44
               ES 3  132 27.34  24.15  21.77  2.36  .09
 HRV  86.1   1 EPD0  132 17.15  13.96  13.93   .00 1.88
               ES 3  132 30.15  26.96  24.79  2.11  .17
QUA2  88.8 313 EP 1  132 17.76  14.57  14.37   .17 1.40
               ES 0  132 28.74  25.55  25.57  -.08 1.87
 FFD 193.3 358 EPD3  132 34.17  30.98  29.50  1.46  .30
               ES 2  132 55.25  52.06  52.51  -.49  .71
NORTHWEST MAINE CRUSTAL STRUCTURE
10/11/03 CANADA, 8.25 KM (5.13 MI) WNW OF ST-PASCAL
 DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 31011  010  2.59 47-33.09  69-53.86  27.57  2.9  .0     117   .41  2.6  8.6 C
 STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
 PQI 173.1 124 EP 1  010 28.98  26.39  25.68   .67 1.40 319 .35  3.0
               ES 0  010 48.10  45.51  45.71  -.26 2.02
 CNQ 236.9  35 EP 0  010 36.21  33.62  33.55   .03 1.70
 GSQ 256.7  54 EP 1  010 39.07  36.48  36.00   .47 1.16
 ICQ 292.7  42 EP 0  010 42.95  40.36  40.44  -.10 1.40
 MOQ 307.9 216 EP 2  010 46.00  43.41  42.32   .95  .44
 MNQ 341.4  14 EP 0  010 49.00  46.41  46.45  -.13 1.13
 GGN 359.7 139 EP 2  010 50.43  47.84  48.72  -.89  .37
               ES 4  010 86.20  83.61  86.71 -3.12  .00
 UMM 367.9 149 EP 1  010 51.79  49.20  49.73  -.54  .70  51 .23  2.9
 SMQ 378.3  38 EP 0  010 53.26  50.67  51.01  -.41  .90
 TRQ 384.5 247 EP 0  010 54.31  51.72  51.77  -.06  .90
LBNH 400.3 203 ES 4  011 54.69 112.10  95.64 16.35  .00
 GRQ 464.7 257 EP 0  010 64.43  61.84  61.67   .11  .46
 FFD 474.0 197 EP 4  011 18.98  76.39  62.82 13.55  .00
               ES 4  011 78.19 135.60 111.82 23.74  .00
 GAC 474.4 244 EP 0  010 65.30  62.71  62.88  -.18  .41
 WBO 502.1 236 ES 4  011 58.11 115.52 118.00 -2.50  .00
 NCB 521.1 220 ES 4  011 83.95 141.36 122.18 19.00  .00
CRLO 595.5 254 EP 3  011 18.75  76.16  77.83 -1.70  .00
 EEO 703.9 262 EP 3  011 32.85  90.26  91.21 -1.02  .00
NORTHWEST MAINE CRUSTAL STRUCTURE
10/12/03 CANADA, 14KM NE OF LAC-DESMARAIS
 DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 31012  826  7.84 47-  .61  76-16.54  23.81  4.0  .0     110   .47  2.0  4.1 C
 STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
VLDQ 151.2 324 EP 3  826 32.90  25.06  23.29  1.74  .16
 TRQ 158.3 124 EP 1  826 32.42  24.58  24.16   .41 2.43
               ES 3  826 52.12  44.28  43.01  1.27  .55
 EEO 217.5 259 EP 0  826 39.24  31.40  31.47  -.15 2.78
 WBO 236.5 161 EP 1  826 42.19  34.34  33.82   .52 1.93
               ES 0  826 67.65  59.81  60.19  -.40 2.59
 MNT 264.3 129 EP 0  826 45.18  37.34  37.25   .06 2.39
               ES 1  826 74.45  66.60  66.31   .26 1.79
 DPQ 269.6  98 EP 1  826 45.40  37.56  37.90  -.35 1.74
               ES 1  826 75.83  67.98  67.47   .51 1.72
KGNO 309.8 183 EP 2  826 51.35  43.51  42.87   .62  .97
               ES 3  826 82.65  74.81  76.31 -1.52  .22
SADO 333.9 222 EP 0  826 53.45  45.60  45.85  -.28 1.81
               ES 4  826 87.10  79.26  81.61 -2.43  .00
 MOQ 363.3 121 EP 0  826 57.38  49.54  49.47  -.08 1.56
               ES 1  826 95.71  87.86  88.06  -.44 1.16
 NCB 373.9 155 EP 1  826 59.00  51.16  50.78   .27 1.10
WLVO 381.0 206 DP 0  826 59.36  51.52  51.66  -.16 1.41
 QCQ 381.5  94 EP 3  826 58.75  50.91  51.73  -.84  .32
               ES 1  826 99.69  91.84  92.07  -.26 1.06
 DAQ 393.8  74 EP 3  826 59.93  52.09  53.24 -1.31  .20
PKRO 403.0 213 EP 0  826 62.00  54.16  54.37  -.25 1.23
 VT1 404.8 137 ES 4  827 59.10 111.26  97.19 14.03  .00
 A54 447.0  84 EP 3  827  6.18  58.34  59.81 -1.53  .08
               ES 2  827 53.70 105.85 106.46  -.71  .41
 LMQ 453.9  82 EP 3  827  7.35  59.51  60.66 -1.22  .15
LBNH 458.2 132 EP 1  827  9.44  61.59  61.20   .34  .57
               ES 4  827 73.33 125.48 108.93 16.45  .00
 A61 473.0  81 EP 3  827  9.55  61.71  63.02 -1.32  .10
               ES 3  827 59.15 111.31 112.17  -.89  .15
 HNH 482.2 140 EP 2  827 12.90  65.06  64.15   .87  .26
               ES 4  827 80.12 132.28 114.19 18.03  .00
 A64 490.5  79 EP 3  827 11.42  63.58  65.17 -1.62  .04
 FFD 535.4 137 EP 1  827 18.28  70.44  70.72  -.31  .09
               ES 4  827 94.01 146.17 125.89 20.24  .00
BINY 535.8 178 EP 3  827 19.64  71.80  70.78   .94  .03
               ES 4  827 87.19 139.34 125.98 13.22  .00
QUA2 611.1 149 EP 1  827 28.17  80.33  80.07   .22  .00
 HRV 624.4 143 EP 4  827 37.77  89.93  81.71  8.19  .00
 PQI 631.6  93 EP 1  827 31.08  83.23  82.60   .60  .00 461 .44  4.1
 WES 646.8 143 EP 1  827 31.90  84.06  84.48  -.43  .00
 BCX 658.5 142 EP 4  827 51.17 103.33  85.92 17.37  .00 145 .29  3.9
 CNQ 660.8  67 EP 3  827 32.61  84.77  86.20 -1.47  .00
               ES 4  827 97.76 149.92 153.44 -3.58  .00
 MNQ 676.3  55 EP 3  827 34.82  86.97  88.11 -1.23  .00
 BRY 679.8 146 EP 4  827 58.31 110.47  88.54 21.86  .00
 YLE 687.6 157 EP 4  826 53.76  45.92  89.51-43.60  .00 810 .50  4.4
 GSQ 716.0  73 EP 3  827 39.17  91.33  93.02 -1.70  .00
 UMM 730.5 110 EP 3  827 41.57  93.72  94.81 -1.09  .00 139 .35  3.9
 GGN 760.7 106 EP 3  827 44.80  96.96  98.54 -1.59  .00
 SMQ 791.4  63 EP 4  827 47.73  99.89 102.32 -2.50  .00
 LMN 891.4  98 EP 4  827 59.53 111.69 114.68 -3.05  .00
SOUTHEAST MAINE CRUSTAL MODEL
10/15/03 CANADA, 10 KM SE OF ST. ANDREWS
 DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 31015  413 15.09 45- 2.57  66-58.54  20.43  3.1 3.0     126   .47  1.9  2.2 C
 STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
 UMM  53.1 226 IPD0  413 24.28   9.19   9.14   .04 4.42              198  3.0
                S 0  413 31.12  16.03  16.27  -.26 4.42
 LMN 192.2  62 EP 3  413 44.15  29.06  27.95  1.05  .64
 PQI 198.2 336 EPD0  413 43.56  28.47  28.69  -.25 3.13 206 .14  3.1
               ES 4  413 68.83  53.74  51.07  2.62  .00
 HAL 270.9 100 EP 0  413 52.80  37.71  37.67   .02 2.48
               ES 3  413 81.10  66.01  67.06 -1.07  .50
 A11 349.1 314 EP 3  413 63.30  48.21  47.32   .88  .40
               ES 0  413 99.40  84.31  84.23   .06 1.79
 A16 356.8 319 EP 1  414  3.82  48.73  48.27   .45 1.26
               ES 1  414 40.62  85.53  85.93  -.40 1.28
 A21 362.0 325 EP 1  414  4.31  49.22  48.91   .29 1.24
               ES 1  414 41.61  86.52  87.07  -.57 1.21
 A54 377.4 315 EP 0  414  5.95  50.86  50.81  -.01 1.54
               ES 3  414 44.31  89.22  90.44 -1.33  .21
 LMQ 379.8 317 EP 1  414  6.53  51.44  51.11   .26 1.14
               ES 3  414 45.15  90.06  90.97 -1.04  .31
 A61 379.8 321 EP 1  414  6.54  51.45  51.11   .33 1.12
               ES 3  414 44.49  89.40  90.97 -1.59  .09
 A64 382.1 324 EP 3  414  7.95  52.86  51.40  1.44  .13
               ES 2  414 45.95  90.86  91.50  -.67  .72
 QCQ 385.8 300 ES 3  414 48.67  93.58  92.31  1.24  .23
LBNH 403.1 257 EP 3  414 10.23  55.14  53.98  1.09  .25
               ES 4  414 67.81 112.72  96.09 16.52  .00
 FFD 412.2 245 EP 4  414 12.74  57.65  55.11  2.52  .00
               ES 4  414 70.97 115.88  98.10 17.75  .00
 MOQ 415.8 274 EP 2  414 11.74  56.65  55.56   .95  .50
               ES 1  414 54.08  98.99  98.90  -.16  .89
 GSQ 430.5 359 EP 2  414 13.06  57.97  57.37   .59  .51
               ES 4  414 54.76  99.67 102.12 -2.47  .00
 HNH 448.4 251 EP 4  414 17.59  62.50  59.58  2.89  .00
               ES 4  414 80.25 125.16 106.05 19.06  .00
 BCX 452.6 228 ES 4  414 80.70 125.61 106.99 18.57  .00  60 .27  3.1
 WES 458.3 230 EP 1  414 16.84  61.75  60.80   .94  .53
               ES 4  414 84.39 129.30 108.22 21.06  .00
 DAQ 461.3 315 EP 1  414 16.96  61.87  61.17   .54  .57
               ES 3  414 62.75 107.66 108.89 -1.51  .07
 HRV 464.2 233 EP 4  414 22.17  67.08  61.53  5.52  .00
               ES 4  414 86.63 131.54 109.52 21.96  .00
 VT1 464.8 260 ES 4  414 89.04 133.95 109.65 24.26  .00
 CNQ 480.8 350 EP 1  414 18.29  63.20  63.58  -.41  .46
               ES 3  414 66.38 111.29 113.17 -1.93  .01
 DPQ 485.7 292 EP 1  414 19.64  64.55  64.18   .37  .42
               ES 4  414 67.91 112.82 114.24 -1.42  .00
 ICQ 498.4 357 EP 1  414 20.43  65.34  65.76  -.43  .34
               ES 4  414 69.45 114.36 117.05 -2.70  .00
 BRY 506.7 227 ES 4  414 45.84  90.75 118.87-28.22  .00
 MNT 523.9 276 EP 1  414 24.38  69.29  68.90   .37  .17
QUA2 531.2 235 EP 4  414 31.36  76.27  69.81  6.43  .00
 SMQ 576.3   2 EP 1  414 30.07  74.98  75.37  -.45  .00
               ES 3  414 86.52 131.43 134.16 -2.84  .00
 NCB 588.7 258 EP 1  414 32.83  77.74  76.90   .74  .00
 TRQ 605.8 282 EP 2  414 34.86  79.77  79.01   .76  .00
               ES 4  414 93.81 138.72 140.64 -1.92  .00
 MNQ 624.8 348 EP 1  414 36.03  80.94  81.35  -.50  .00
               ES 4  414 96.74 141.65 144.81 -3.32  .00
 YLE 637.1 229 ES 4  414 43.45  88.36 147.53-59.17  .00
 WBO 654.4 270 ES 4  415 44.07 148.98 151.33 -2.37  .00
 GAC 669.8 276 EP 1  414 42.51  87.42  86.91   .50  .00
 GRQ 712.3 284 EP 2  414 48.04  92.95  92.16   .74  .00
CRLO 820.7 278 EP 1  415   .44 105.35 105.55  -.23  .00
               ES 4  415 78.55 183.46 187.88 -4.47  .00
NORTHWEST MAINE CRUSTAL STRUCTURE
10/18/03 CANADA, 41 KM (25.5 MI) ESE OF GRAND FALLS
 DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 31018 1625  7.46 46-56.38  67-12.52  21.70  3.3  .0     117   .46  1.1  1.8 C
 STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
 PQI  68.6 244 EP 1 1625 18.25  10.79  11.50  -.74 2.19 533 .12  2.8
               ES 1 1625 27.61  20.15  20.47  -.37 2.26
 GGN 204.8 172 EP 1 1625 37.68  30.22  30.08   .13 1.64
 A21 206.0 294 EP 3 1625 38.69  31.23  30.23   .99  .46
               ES 0 1625 61.33  53.87  53.81   .04 2.18
 GSQ 219.7   2 EP 1 1625 39.48  32.02  31.92   .09 1.57
               ES 0 1625 63.99  56.53  56.82  -.30 2.09
 A16 220.2 285 EP 3 1625 40.40  32.94  31.99   .95  .46
               ES 1 1625 64.29  56.83  56.94  -.11 1.57
 LMN 220.8 123 EP 1 1625 39.30  31.84  32.06  -.28 1.56
               ES 3 1625 64.20  56.74  57.07  -.44  .52
 A64 225.2 296 EP 2 1625 40.69  33.23  32.61   .60 1.00
               ES 0 1625 65.47  58.01  58.04  -.06 2.06
 A11 229.4 278 EP 3 1625 41.67  34.21  33.12  1.08  .39
               ES 0 1625 66.71  59.25  58.96   .27 2.01
 A61 233.6 291 EP 2 1625 41.92  34.46  33.64   .82  .92
               ES 1 1625 67.24  59.78  59.87  -.11 1.50
 LMQ 245.8 286 EP 2 1625 43.25  35.79  35.14   .58  .93
               ES 1 1625 70.00  62.54  62.55  -.14 1.45
 UMM 248.6 184 EP 1 1625 41.00  33.54  35.49 -1.96  .12 525 .17  3.6
               ES 4 1625 77.23  69.77  63.17  6.58  .00
 A54 249.5 283 EP 1 1625 43.68  36.22  35.61   .56 1.38
               ES 1 1625 70.76  63.30  63.38  -.18 1.43
 CNQ 270.5 346 EP 1 1625 45.63  38.17  38.19  -.05 1.33
               ES 1 1625 74.87  67.41  67.98  -.63 1.29
 ICQ 287.1 359 EP 2 1625 48.03  40.57  40.25   .31  .82
               ES 0 1625 78.85  71.39  71.64  -.27 1.67
 QCQ 310.8 267 EP 1 1625 51.11  43.65  43.16   .47 1.11
               ES 2 1625 84.05  76.59  76.83  -.28  .76
 DAQ 324.6 291 EP 2 1625 53.04  45.58  44.87   .55  .69
               ES 2 1625 87.00  79.54  79.87  -.61  .69
 SMQ 367.0   6 EP 2 1625 58.06  50.60  50.11   .43  .57
               ES 3 1625 95.43  87.97  89.19 -1.33  .20
 HAL 380.0 132 EP 2 1626   .20  52.74  51.72  1.01  .44
               ES 2 1626 39.56  92.10  92.06   .02  .54
 MNQ 415.5 344 EP 2 1626  4.00  56.54  56.10   .36  .42
               ES 3 1626 46.07  98.61  99.85 -1.40  .13
 DPQ 426.1 266 EP 0 1626  5.14  57.68  57.41   .27  .78
               ES 3 1626 48.37 100.91 102.18 -1.27  .14
 MOQ 430.1 245 EP 0 1626  5.80  58.34  57.89   .31  .75
               ES 3 1626 49.59 102.13 103.05 -1.17  .15
LBNH 474.9 231 EP 0 1626 11.38  63.92  63.43   .43  .47
               ES 4 1626 58.30 110.84 112.90 -2.17  .00
 FFD 520.2 222 EP 0 1626 16.83  69.37  69.03   .32  .19
               ES 4 1626 90.76 143.30 122.87 20.40  .00
 MNT 520.2 252 EP 0 1626 16.50  69.04  69.03  -.01  .19
               ES 4 1626 68.03 120.57 122.87 -2.33  .00
 VT1 520.8 236 ES 4 1627 41.05 153.59 122.99 30.57  .00
 HNH 536.4 228 ES 4 1627 40.96 153.50 126.43 27.02  .00
 TRQ 568.6 262 EP 0 1626 22.48  75.02  75.00   .02  .00
               ES 4 1626 78.59 131.13 133.50 -2.36  .00
 BCX 600.7 212 ES 4 1627 56.08 168.62 140.55 28.02  .00 111 .35  3.5
 HRV 601.3 215 ES 4 1627 56.03 168.57 140.69 27.83  .00
 WES 602.1 213 EP 0 1626 26.67  79.21  79.14   .06  .00
 NCB 639.9 239 EP 4 1626 33.61  86.15  83.80  2.25  .00
 GAC 651.8 258 EP 0 1626 32.72  85.26  85.27  -.02  .00
               ES 4 1626 96.23 148.77 151.78 -3.03  .00
 BRY 656.0 212 ES 4 1627 77.08 189.62 152.71 36.81  .00
QUA2 659.6 218 EP 4 1626 56.82 109.36  86.24 23.10  .00
 WBO 661.0 251 EP 0 1626 33.95  86.49  86.41   .07  .00
               ES 4 1626 98.15 150.69 153.81 -3.13  .00
 GRQ 661.5 267 EP 3 1626 33.44  85.98  86.47  -.54  .00
               ES 4 1626 98.38 150.92 153.92 -3.08  .00
 YLE 775.2 216 ES 4 1627 41.80 154.34 178.90-24.56  .00
VLDQ 782.9 280 EP 3 1626 49.85 102.39 101.45   .92  .00
CRLO 787.2 263 EP 4 1626 47.65 100.19 101.99 -1.83  .00
 EEO 906.4 268 EP 4 1626 62.44 114.98 116.70 -1.79  .00
SADO 957.0 255 EP 1 1626 70.03 122.57 122.95  -.42  .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, 2003. 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-December, 2003.

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NESN Quarterly Seismicity Map

Figure 3: Earthquake epicenters located by the NESN during period October-December, 2003.

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NESN Cumulative Seismicity Map

Figure 4: Seismicity for period October, 1975 - December, 2003.

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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 developedin-house using ArcView and in part basemap data provided byESRI, 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 lengthmagnitude scale for New England, Earthquake Notes, 51, 15-22.

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

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

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