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A STUDY OF NEW ENGLAND SEISMICITY

Quarterly Earthquake Report



January-March, 2004



New England

Seismic Network



Weston Observatory

381 Concord Road

Weston, MA 02493





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 # 04HQAG0020

Prepared by Anastasia Macherides Moulis

Email: macherid@bc.edu

April 1, 2004

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 04HQAG0020. The views 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

January-March, 2004

Table of Contents

Introduction

The New England Seismic Network (NESN) is operated by the Weston Observatory (WES) of Boston College. 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 of the NESN for the period January-March, 2004. 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 3 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 of Weston Observatory of Boston College currently consists of 11 broadband three-component and 8 analog 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. The 11 stations consist 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 also maintains 8 SMA-1 strong-motion instruments in New England.

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Seismicity

There were 4 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/research/westonobservatory/northeast/recenteqs/. Waveform data are saved in Nanometrics, ASCII, and SEED formats and are available by contacting, Anastasia Macherides Moulis, via email. Earthquake lists can be found at www.bc.edu/research/westonobservatory/northeast/eqcatalogs/. Currently available on the Weston Observatory web page is the full catalog of northeastern U.S. earthquake activity to the present time. This will be updated as new Northeastern U.S. Seismic Network Quarterly Earthquake Reports are produced.

For more information on matters discussed in this report or general earthquake information (reports, maps, catalogs, etc.) consult our web site www.bc.edu/westonobservatory or contact:





Anastasia Macherides Moulis

Weston Observatory

381 Concord Road

Weston, MA 02493

Voice: 617-552-8325 / FAX: 617-552-8388 / Email: anastasia.macherides.1@bc.edu



Dina Smith

Weston Observatory

381 Concord Road

Weston, MA 02493

Voice: 617-552-8335 / FAX: 617-552-8388 / Email: dina.smith.1@bc.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)



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TABLE 2




         

SEISMIC STATIONS OF THE NEW ENGLAND SEISMIC NETWORK

WESHNH43.7050-72.3525Belchertown, MATroy, NYWESUMMWES42.3850WESYLEPQI46.6710
Code Lat Long Elev (m) Location Operator
BCX 42.3350 -71.1705 61.0 Chestnut Hill, MA WES
BRYW 41.9178 -71.5388 380.0 Smithfield, RI WES
FFD 43.4702 -71.6533 131.0 Franklin Falls Dam, NH
-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
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

* = not in operation during this quarter


          

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

January-March, 2004


Date

M/D/Y
Time (UTC)

Hr:Mn:Sec
Lat Long Depth

(km)
Mag Int Location
01/20/2004 17:11:54.12 43.1972 -71.7713 9.56 2.5
NH, 20 KM W OF CONCORD, NH
02/24/2004 01:54:42.80 41.5631 -71.0113 1.58 2.0
MA, DARTMOUTH, 1.2 KM SSW OF RUSSELLS MILLS, MA
03/17/2004 01:44:44.42 43.1958 -70.5800 5.00 2.0
ME, 4.25 KM NE OF CAPE NEDDICK
03/17/2004 12:38:15.91 45.0320 -75.6440 12.41 2.5 mblg (Canada)
CANADA, ON, KEMPTVILLE
* indicates Mc rather than Mn.

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TABLE 4

EARTHQUAKE PHASE DATA LIST
NEW ENGLAND AND ADJACENT REGIONS
January-MArch, 2004

A4120A.XX
HUGHES AND LUETGERT NH
04JAN20 NH, 20 KM (15 MI) W OF CONCORD
  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
  40120 1711 54.12 43-11.83  71-46.28   9.56  2.5  .0     135   .47  2.2  2.8 C
  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  FFD  31.8  18 EPC0 1712   .09   5.97   5.56   .39 1.56
                ES 1 1712  3.64   9.52   9.90  -.42 1.17
  HNH  70.1 324 EP 0 1712  5.87  11.75  11.74  -.03 1.46
                ES 2 1712 14.16  20.04  20.91  -.92  .59
  HRV  78.7 167 EPD1 1712  7.73  13.61  13.14   .44 1.05
                ES 0 1712 17.19  23.07  23.38  -.37 1.42
  QUA  95.8 211 EP 4 1712 12.92  18.80  15.86  2.91  .00
                ES 4 1712 26.82  32.70  28.23  4.42  .00
  WES  97.5 158 EPD1 1712 10.87  16.75  16.11   .63  .98
                ES 3 1712 21.84  27.72  28.67  -.97  .26
  BCX 107.7 153 EPD0 1712 12.47  18.35  17.69   .63 1.27 127 .14  2.4
                ES 1 1712 25.19  31.07  31.49  -.47  .99
  BRY 143.4 172 EPD0 1712 17.70  23.58  23.23   .29 1.22
                ES 3 1712 34.51  40.39  41.35 -1.07  .21
 ACCN 155.3 278 EP 0 1712 19.01  24.89  25.08  -.25 1.20
  MIV 172.2 304 EP 0 1712 21.74  27.62  27.51   .06 1.15
  NCB 215.9 293 EP 1 1712 26.51  32.39  32.90  -.61  .73
                ES 1 1712 53.35  59.23  58.56   .49  .74
  WVL 224.8  49 EPD4 1712 31.71  37.59  34.00  3.58  .00  50 .21  2.5
                ES 4 1712 58.13  64.01  60.52  3.47  .00
  YLE 230.3 204 ES 4 1712 62.43  68.31  61.72  6.59  .00  89 .24  2.7
  PTN 299.9 301 EP 4 1712 33.71  39.59  43.27 -3.71  .00
  PAL 301.0 216 EP 4 1712 45.32  51.20  43.41  7.77  .00
 BINY 362.8 252 EP 4 1712 47.63  53.51  51.04  2.39  .00
A4224A.XX
MA, DARTMOUTH, 1.2 KM (0.75 MI) SSW OF RUSSELLS MILLS
SOUTHEAST MAINE CRUSTAL MODEL
 DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 40224  154 42.80 41-33.79  71-  .68   1.58  2.0 2.0     314   .20  1.8  4.2 B
 STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
 BRY  59.0 312 EPD0  154 52.59   9.79   9.76  -.03 1.18               45  1.7
               ES 0  154 60.36  17.56  17.38   .08 1.18
 BCX  86.7 351 EP 0  154 57.35  14.55  14.17   .36  .97  61 .18  2.0
               ES 0  154 68.12  25.32  25.22   .05 1.11
 WES  94.8 344 EPD0  154 58.12  15.32  15.45  -.13 1.09               82  2.3
               ES 0  154 69.74  26.94  27.50  -.57  .61
 HRV 114.1 337 EPD0  154 61.21  18.41  18.52  -.13 1.05
               ES 0  154 75.98  33.18  32.96   .17 1.04
QUA2 136.8 306 EP 0  155  4.89  22.09  22.11  -.05  .99
               ES 0  155 22.14  39.34  39.36  -.06  .99
 FFD 218.3 346 EP 0  155 16.06  33.26  33.09   .15  .79
               ES 4  155 43.66  60.86  58.91  1.92  .00
A4317A.XX
SOUTHEAST MAINE CRUSTAL MODEL
04MAR17 ME, OFFCOAST, 4.25 KM (2.64 MI) NE OF CAPE NEDDICK
  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
  40317  144 44.42 43-11.75  70-34.80   5.00  2.1 2.3     180   .34  2.1  2.5 C
  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
  FFD  92.3 289 EPC1  144 59.56  15.14  14.90   .22 1.18              105  2.5
                 S 2  144 71.21  26.79  26.52   .23  .79
  BCX 107.1 207 EP 0  144 61.70  17.28  17.26  -.01 1.54  59 .12  2.1
                 S 3  144 74.10  29.68  30.72 -1.09  .11
  WES 108.7 214 EP 1  144 62.53  18.11  17.50   .60 1.01               93  2.4
                 S 1  144 74.87  30.45  31.15  -.72  .97
  HRV 110.7 226 EP 1  144 62.63  18.21  17.82   .36 1.11               60  2.1
                 S 1  144 76.19  31.77  31.73  -.01 1.15
  HNH 149.1 292 EPC1  144 68.00  23.58  23.92  -.37 1.03               61  2.2
                 S 1  144 87.10  42.68  42.58   .05 1.05
 LBNH 158.9 317 EP 0  144 69.85  25.43  25.37   .00 1.36               78  2.4
                 S 0  144 89.60  45.18  45.17  -.09 1.36
  WVL 165.4  26 EP 3  144 70.15  25.73  26.18  -.46  .32  17 .12  1.9
                 S 4  144 89.61  45.19  46.61 -1.43  .00
  UMM 301.7  56 EP 4  145 48.23  63.81  43.00 20.80  .00  15 .16  2.3
                 S 4  145 66.37  81.95  76.55  5.38  .00
B4317B.XX
SE OF NEW YORK, HUGHES & LUETGERT
CANADA, ONTARIO, KEMPTVILLE
 DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q
 40317 1238 15.91 45- 1.92  75-38.64  12.41   .0  .0     122   .33  2.4  3.4 C
 STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG
KGNO 112.0 217 EP 0 1238 32.93  17.02  17.25  -.24 1.45
 NCB 163.3 136 EP 3 1238 42.34  26.43  24.93  1.40  .22
                S 0 1238 60.75  44.84  44.37   .29 1.28
 MNT 166.9  72 EP 0 1238 41.45  25.54  25.46   .06 1.27
CRLO 175.8 309 EP 0 1238 42.78  26.87  26.77   .07 1.24
 MIV 198.8 122 EP 0 1238 45.96  30.05  30.09  -.09 1.17
                S 0 1238 69.09  53.18  53.56  -.47 1.14
ACCN 241.8 139 ES 0 1238 79.26  63.35  63.02   .22 1.02
 HNH 305.5 119  S 3 1238 92.54  76.63  77.01  -.43  .20
LBNH 308.0 107  S 3 1238 96.91  81.00  77.57  3.32  .00
 EEO 321.1 304 EP 4 1238 92.40  76.49  45.19 31.23  .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 the period of this report. Also included are other Northeast U.S. and Canadian seismic stations in operation 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 the period of this report.

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NESN Quarterly Seismicity Map

Figure 3: Earthquake epicenters located by the NESN during the period of this report.

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NESN Cumulative Seismicity Map

Figure 4: Seismicity for period October, 1975 - March, 2004.

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Acknowledgments

Our map database has been developed in-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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