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A STUDY OF NEW ENGLAND SEISMICITY

Quarterly Earthquake Report

January - March, 2008

 



Weston Observatory
New England Seismic Network
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
and Dina Smith
April, 2008

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 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, 2008

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 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, 2008. 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 9 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 12 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 12 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. Weston Observatory also maintains 8 SMA-1 strong-motion instruments in New England.

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Seismicity

There were 9 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 http://aki.bc.edu/cgi-bin/NESN/recent_events.pl. 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 = 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. Mn = Nuttli Magnitude
  7. Mc = Coda Magnitude
  8. Int = event epicentral intensity
  9. Location = event geographic location

Table 4: Earthquake detailed hypocenter and phase data list

  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 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 = 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 Position voice phone email address
John E. Ebel Observatory Director, Seismologist, Principal Investigator 617-552-8319 ebel@bc.edu
Alan Kafka Research Seismologist 617-552-8300 kafka@bc.edu
Anastasia Macherides Moulis Seismologist, Analyst 617-552-8325 macherid@bc.edu
Dina Smith Associate Director of Operations, Seismologist 617-552-8335 dina.smith.1@bc.edu
Michael Hagerty New England Seismic Network Manager, Seismologist 617-552-8337 hagertmb@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

Code Lat Long Elev (m) Location Operator
BCX * 42.3350 -71.1705 61.0 Chestnut Hill, MA WES
BRYW 41.9199 -71.5342 107 Smithfield, RI WES
FFD 43.4700 -71.6539 131 Franklin Falls Dam, NH WES
HNH 43.7051 -72.2865 180 Hanover, NH WES
QUA2 42.2790 -72.3521 168 Belchertown, MA WES
TRY 42.7305 -73.6658 131 Troy, NY WES
EMMW 44.7101 -67.4580 34 Machias, ME WES
VT1 44.3317 -72.7536 125 Waterbury, VT WES
WES 42.3848 -71.3218 60 Weston, MA WES
WVL 44.5648 -69.6575 85 Waterville, ME WES
YLE 41.3165 -72.9209 10 New Haven, CT WES
PQI 46.6701 -68.0133 175 Presque Isle, ME WES

* = not in operation during this quarter


          

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


HYPOCENTERS FOR EARTHQUAKES IN NEW ENGLAND AND ADJACENT REGIONS
January - March, 2008


Date
M/D/Y
Time (UTC)
Hr:Mn:Sec
Lat Long Depth
(km)
Mn Mc Int Location
1/03/2008 09:37:55.38 47.38 -70.36 11.48 2.9 3.2
PQ, 30KM SE OF BAIE-ST-PAUL
1/10/2008 06:12:44.33 46.05 -74.82 05.00
3.0
PQ, 16KM SW OF MONT-TREMBLANT
0/10/2008 11:36:53.02 44.67 -74.66 01.85 2.3 2.6
NY, 0.6KM N OF LAKE OZONIA
01/25/2008 09:21:14.10 43.95 -70.03 11.49 1.7 2.4
ME, 5.2KM NW OF BRUNSWICK
2/27/2008 07:56:18.42 42.71 -74.38 00.08 2.3 3.0
NY, 46.8KM W OF TROY
3/03/2008 05:39:49.76 44.63 -69.13 00.04 1.9 2.1
ME, 36.8KM ENE OF WATERVILLE
3/06/2007 03:31:36.25 43.57 -73.32 04.61 1.5 1.5
NY, 25.2KM WSW OF RUTLAND(VT)
03/09/2008 11:11:18.67 43.02 -70.36 00.31 2.8 2.7
NH, 26.2KM ESE OF PORTSMOUTH
3/11/2008 03:10:30.97 41.44 -72.48 02.86 2.0 2.3
CT, 2KM SW OF EAST HADDAM
* indicates magnitude as calculated by Lamont Doherty Earth Observatory
^ indicates magnitude as calculated by Earthquakes Canada (Natural Resources Canada)

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TABLE 4

EARTHQUAKE PHASE DATA LIST
NEW ENGLAND AND ADJACENT REGIONS
January - March, 2008

Run Hyp2000: Phase File: [85.X] Vel Mod: [12] ===> XX-File: 85.XX
 HYPOINVERSE 2000 (10/2006 VERSION) RUN ON Tue Jan  8 13:06:35 2008      RUN LABEL= 
 CRUST MODEL  1: 12. NORTHWEST MAINE CRUSTAL ST

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q 
200801030937 55.38 47-22.90  70-21.77  11.48  2.9 3.2     126  0.03  0.6  0.8
CANADA, PQ, 30KM SE BAIE-SAINT-PAUL, QUEBEC


 NSTA NPHS DMIN N.XMG N.FMG
  14  18  18.70   1   6

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG ANG 
  LMQ  18.7   8 EPC1  937 59.03   3.65   3.58  0.00 1.39                       119
  A11  19.9 141 EPC0  937 59.12   3.74   3.74 -0.01 1.85                       117
  QCQ  96.4 227 EPC0  938 11.04  15.66  15.64  0.00 1.72              122  2.6  94
  PQI 195.4 113 EPC3  938 25.19  29.81  29.92 -0.14 0.33                        51
 PKME 249.4 160 EPC0  938 32.02  36.64  36.59  0.03 1.07              246  3.4  51
  MOQ 272.3 214 EPC1  938 34.98  39.60  39.42  0.04 0.71              218  3.3  51
 BATG 325.6  90 EPC0  938 40.22  44.84  46.00 -1.22 0.00              208  3.3  51
                 S 3  939 14.31  78.93  81.88 -3.06 0.00                      
 MRHQ 338.5 242 EPC0  938 42.99  47.61  47.59 -0.05 0.60                        51
 LBNH 369.7 200 EPC1  938 46.64  51.26  51.45 -0.25 0.34                        51
  GGN 371.4 131 EPC0  938 45.95  50.57  51.66 -1.10 0.00              234  3.4  51
                 S 2  939 24.84  89.46  91.95 -2.51 0.00                      
 EMMW 372.5 141 EPC0  938 46.29  50.91  51.79 -0.89 0.00 0.4 .15  2.9 214  3.4  51
                 S 2  939 24.70  89.32  92.19 -2.88 0.00                      
 LONY 448.5 229 EPC1  938 56.05  60.67  61.18 -0.58 0.00                        51
  LMN 458.6 109 EPC1  938 56.12  60.74  62.42 -1.74 0.00                        51
                 S 2  939 43.20 107.82 111.11 -3.39 0.00                      
  NCB 483.7 220 EPC0  939  0.51  65.13  65.52 -0.49 0.00                        51





Run Hyp2000: Phase File: [87.X] Vel Mod: [6] ===> XX-File: 87.XX
 HYPOINVERSE 2000 (10/2006 VERSION) RUN ON Thu Jan 17 15:34:13 2008      RUN LABEL= 
 CRUST MODEL  1: 6. NORTHERN NY AND ADIRONDACKS

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q 
200801100612 44.33 46- 3.21  74-49.21   5.00      3.0     298  0.10  1.7  15.2
CANADA, PQ, 16KM SW OF MONT-TREMBLANT

 NSTA NPHS DMIN N.XMG N.FMG
   4   6  50.60   0   4

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG ANG 
 MRHQ  50.6 111 EPC0  612 52.25   7.92   7.92 -0.07 1.58              199  3.0  91
                 S 2  612 58.63  14.30  14.10  0.08 0.79                      
  MNT 111.4 122 EPC1  613  2.02  17.69  17.13  0.54 0.36              130  2.7  90
 LONY 160.4 173 EPC0  613  9.01  24.68  24.55  0.06 1.30              201  3.2  90
                 S 1  613 28.09  43.76  43.70 -0.06 0.97                      
 LBNH 304.0 130 EPC2  613 29.45  45.12  43.32  1.74 0.00              184  3.2  54





Run Hyp2000: Phase File: [88.X] Vel Mod: [6] ===> XX-File: 88.XX
 HYPOINVERSE 2000 (10/2006 VERSION) RUN ON Fri Jan 11 11:49:46 2008      RUN LABEL= 
 CRUST MODEL  1: 6. NORTHERN NY AND ADIRONDACKS

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q 
200801101136 53.02 44-40.38  74-39.84   1.85  2.3 2.6     242  0.10  2.6  1.8
NY, 0.6KM N OF LAKE OZONIA, 50KM E OF POTSDAM

 NSTA NPHS DMIN N.XMG N.FMG
   4   7   8.80   1   3

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG ANG 
 LONY   8.8 132 EPC0 1136 54.49   1.47   1.46 -0.06 1.52              127  2.5 101
                 S 1 1136 55.81   2.79   2.60  0.07 1.14                      
 MRHQ 139.5  14 EPC1 1137 14.75  21.73  21.51  0.15 0.97              141  2.8  67
                 S 2 1137 31.24  38.22  38.29 -0.19 0.65                      
  HNH 218.4 118 EPC4 1137 20.72  27.70  33.07 -5.40 0.00 0.2 .20  2.1           48
 LBNH 223.2 101 EPC1 1137 26.74  33.72  33.66  0.00 0.74               92  2.6  48
                 S 2 1137 52.22  59.20  59.91 -0.82 0.00                 





Run Hyp2000: Phase File: [89.X] Vel Mod: [11] ===> XX-File: 89.XX
 HYPOINVERSE 2000 (10/2006 VERSION) RUN ON Tue Jan 29 14:18:31 2008      RUN LABEL= 
 CRUST MODEL  1: 11. SOUTHEAST MAINE CRUSTAL MO

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q 
200801250921 14.10 43-57.18  70- 1.74  11.49  1.7 2.4     183  0.15  1.6  1.1
ME, 5.2KM NW OF BRUNSWICK

 NSTA NPHS DMIN N.XMG N.FMG
   8  15  70.40   3   5

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG ANG 
  WVL  70.4  24 EPC2  921 25.64  11.54  11.48  0.05 1.16                        96
                 S 3  921 34.05  19.95  20.43 -0.50 0.58                      
  FFD 141.5 249 EPC1  921 36.62  22.52  22.58 -0.08 1.53                        51
                 S 2  921 54.29  40.19  40.19 -0.04 1.02                      
 LBNH 155.2 283 EPC2  921 38.52  24.42  24.27  0.09 0.98                        51
                 S 3  921 59.02  44.92  43.20  1.61 0.00                      
 PKME 157.0  21 EPC0  921 38.76  24.66  24.50  0.14 1.96              116  2.7  51
                 S 2  921 57.57  43.47  43.61 -0.18 0.98                      
  HNH 183.7 263 EPC3  921 43.11  29.01  27.79  1.19 0.00 0.1 .10  1.6  54  2.2  51
                 S 3  922  5.24  51.14  49.47  1.62 0.00                      
  WES 203.5 212 EPC4  922  6.67  52.57  30.23 22.33 0.00 0.1 .15  1.5  31  2.2  51
 EMMW 221.7  66 EPC1  921 59.09  44.99  32.48 12.50 0.00 0.2 .18  2.0  55  2.4  51
                 S 3  922 11.60  57.50  57.81 -0.33 0.39                      
  GGN 285.9  61 EPC1  921 54.35  40.25  40.41 -0.17 0.85               94  2.7  51
                 S 2  922 26.18  72.08  71.93  0.13 0.57                      





Run Hyp2000: Phase File: [95.X] Vel Mod: [12] ===> XX-File: 95.XX
 HYPOINVERSE 2000 (10/2006 VERSION) RUN ON Wed Feb 27 14:18:36 2008      RUN LABEL= 
 CRUST MODEL  1: 12. NORTHWEST MAINE CRUSTAL ST

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q 
200802270756 18.42 42-42.72  74-22.68   0.08  2.3 3.0     128  0.85  3.0  7.2
NY, 46.8KM W OF TROY

 NSTA NPHS DMIN N.XMG N.FMG
  12  24  58.40   6  11

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG ANG 
  TRY  58.4  87 EPC0  756 28.16   9.74   9.83 -0.14 1.74 0.7 .10  1.7 120  2.6  71
                 S 2  756 32.81  14.39  17.50 -3.20 0.00                      
 BINY 144.2 247 EPC0  756 41.33  22.91  23.49 -0.66 1.51              156  2.9  64
                 S 2  756 56.00  37.58  41.81 -4.37 0.00                      
  MDV 172.8  33 EPC0  756 45.39  26.97  28.03 -1.08 1.39              178  3.1  64
                 S 2  757  2.50  44.08  49.89 -5.85 0.00                      
 QUA2 173.4 105 EPC0  756 46.55  28.13  28.11 -0.01 1.39 0.8 .10  2.5 159  3.0  64
                 S 2  757  3.04  44.62  50.04 -5.47 0.00                      
  HNH 202.7  56 EPC0  756 50.59  32.17  32.04  0.10 1.26 0.3 .15  2.2 166  3.0  44
                 S 3  757 11.36  52.94  57.03 -4.14 0.00                      
 UCCT 204.8 119 EPC0  756 50.45  32.03  32.31 -0.31 1.25              145  2.9  44
                 S 4  757  8.70  50.28  57.51 -7.29 0.00                      
 LONY 212.6 356 EPC0  756 51.40  32.98  33.26 -0.35 1.21              176  3.1  44
                 S 4  757 10.77  52.35  59.20 -6.98 0.00                      
  FFD 237.3  68 EPC0  756 56.48  38.06  36.31  1.73 1.08 1.2 .10  2.9 151  3.0  44
                 S 3  757 20.67  62.25  64.63 -2.42 0.15                      
 BRYW 250.5 109 EPC1  756 58.38  39.96  37.94  1.96 0.70 0.2 .10  2.2 151  3.0  44
                 S 4  757 20.02  61.60  67.53 -6.04 0.00                      
  WES 253.7  97 EPC0  756 57.12  38.70  38.34  0.35 1.01 0.2 .10  2.2 164  3.1  44
                 S 4  757 17.11  58.69  68.25 -9.57 0.00                      
 LBNH 261.1  48 EPC0  756 59.61  41.19  39.26  1.87 0.92              164  3.1  44
                 S 3  757 24.16  65.74  69.88 -4.25 0.00                      
 MRHQ 353.0   2 EPC1  757 10.80  52.38  50.60  1.71 0.38                        44
                 S 4  757 42.56  84.14  90.07 -6.05 0.00                      





HYPOINVERSE 2000 (10/2006 VERSION) RUN ON Tue Mar  4 13:02:58 2008      RUN LABEL= 
 CRUST MODEL  1: 12. NORTHWEST MAINE CRUSTAL ST

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q 
200803030539 49.76 44-37.52  69- 7.84   0.04  1.9 2.1     184  0.14  7.9  3.4
ME, 36.8KM ENE OF WATERVILLE

 NSTA NPHS DMIN N.XMG N.FMG
   7  14  43.90   5   4

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG ANG 
  WVL  43.9 257 EPC0  539 57.06   7.30   7.41 -0.12 1.34 1.4 .05  1.6  28  1.3  71
                 S 2  540  1.71  11.95  13.19 -1.26 0.00                      
 EMMW 133.0  85 EPC0  540 11.42  21.66  21.71 -0.06 1.18 0.3 .10  1.8  54  2.1  64
                 S 4  540 26.71  36.95  38.64 -1.71 0.00                      
 LBNH 226.7 261 EPC0  540 25.07  35.31  35.01  0.24 0.87               88  2.6  44
                 S 4  540 52.21  62.45  62.32  0.03 0.00                      
  FFD 239.5 239 EPC1  540 26.56  36.80  36.60  0.18 0.61 0.4 .15  2.5  81  2.6  44
                 S 4  540 54.24  64.48  65.15 -0.70 0.00                      
  HNH 272.4 250 EPC4  540 37.42  47.66  40.65  6.98 0.00 0.1 .05  2.1           44
                 S 4  540 56.46  66.70  72.36 -5.71 0.00                      
  WES 305.6 217 EPC4  540 53.14  63.38  44.75 18.62 0.00 0.0 .15  1.5           44
                 S 4  541 10.67  80.91  79.65  1.24 0.00                      
  LMN 366.0  66 EPC3  541  4.99  75.23  52.21 22.96 0.00                        44
                 S 4  541 33.07 103.31  92.93 10.27 0.00                      





Run Hyp2000: Phase File: [09.X] Vel Mod: [3] ===> XX-File: 09.XX
 HYPOINVERSE 2000 (10/2006 VERSION) RUN ON Thu Mar  6 12:34:41 2008      RUN LABEL= 
 CRUST MODEL  1: 3. SE OF NEW YORK, HUGHES & LU

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q 
200803060331 36.25 43-34.06  73-19.37   4.61  1.5 2.2     209  0.24  1.3  17.3
NY, 25.2KM WSW OF RUTLAND, VT

 NSTA NPHS DMIN N.XMG N.FMG
   6  12  49.30   2   6

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG ANG 
  MDV  49.3  13 EPC0  331 43.77   7.52   7.59 -0.09 1.81               77  2.1  94
                 S 2  331 49.90  13.65  13.51  0.10 0.91                      
  HNH  85.0  79 EPC0  331 48.91  12.66  13.04 -0.41 1.63 0.1 .05  1.0  78  2.2  92
                 S 2  331 59.85  23.60  23.21  0.34 0.87                      
  NCB  85.3 303 EPC2  331 49.75  13.50  13.09  0.31 0.87               76  2.2  92
                 S 3  332  0.06  23.81  23.30  0.33 0.44                      
 LBNH 134.8  55 EPC0  331 57.07  20.82  20.64  0.12 1.59               70  2.3  91
                 S 3  332 13.35  37.10  36.74  0.25 0.40                      
  FFD 135.4  94 EPC1  331 57.14  20.89  20.73  0.14 1.19 0.5 .10  2.0  47  2.0  91
                 S 3  332 13.38  37.13  36.90  0.19 0.40                      
 LONY 154.4 320 EPC1  332  0.06  23.81  23.65  0.09 1.14               86  2.5  91
                 S 2  332 18.09  41.84  42.10 -0.38 0.75





Run Hyp2000: Phase File: [10.X] Vel Mod: [1] ===> XX-File: 10.XX
 HYPOINVERSE 2000 (10/2006 VERSION) RUN ON Mon Mar 10 12:34:16 2008      RUN LABEL= 
 CRUST MODEL  1: 1. SOUTH & COASTAL NEW ENGLAND

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q 
200803091111 18.67 43- 1.34  70-21.87   0.31  2.8 2.7     204  0.55  4.4  6.5
NH, 26.2KM ESE OF PORTSMOUTH

 NSTA NPHS DMIN N.XMG N.FMG
  10  18  101.00   5   8

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG ANG 
  BCX 101.0 222 EPC2 1111 34.94  16.27  16.77 -0.53 0.98 3.0 .10  2.6  87  2.4  61
                 S 4 1111 47.52  28.85  29.85 -1.05 0.00                      
  WES 105.7 229 EPC1 1111 35.84  17.17  17.55 -0.39 1.46 2.0 .11  2.5  91  2.4  61
                 S 2 1111 49.54  30.87  31.24 -0.39 0.97                      
  FFD 115.9 296 EPC2 1111 38.42  19.75  19.24  0.49 0.96 8.9 .19  3.4 112  2.6  61
                 S 4 1111 52.63  33.96  34.25 -0.32 0.00                      
  HNH 173.3 297 EPC1 1111 46.17  27.50  27.95 -0.48 1.24 1.0 .20  2.7 118  2.7  40
                 S 4 1112  7.14  48.47  49.75 -1.33 0.00                      
  WVL 176.7  18 EPC2 1111 46.75  28.08  28.37 -0.30 0.82              149  2.9  40
 QUA2 182.7 244 EPC0 1111 48.69  30.02  29.11  0.88 1.58 1.5 .11  2.8  91  2.6  40
                 S 4 1112  7.29  48.62  51.82 -3.25 0.00                      
 LBNH 184.9 318 EPC1 1111 48.16  29.49  29.38  0.05 1.20              138  2.9  40
                 S 4 1112 11.13  52.46  52.30  0.06 0.00                      
  YLE 283.8 229  S 4 1112 38.31  79.64  74.03  5.61 0.00                        40
  NCB 329.6 291 EPC1 1112  5.35  46.68  47.24 -0.66 0.56              167  3.1  40
                 S 4 1112 41.05  82.38  84.09 -1.89 0.00                      
 LONY 383.1 300 EPC2 1112 12.17  53.50  53.85 -0.42 0.23                        40
                 S 4 1112 59.92 101.25  95.85  5.27 0.00           





Run Hyp2000: Phase File: [12.X] Vel Mod: [1] ===> XX-File: 12.XX
 HYPOINVERSE 2000 (10/2006 VERSION) RUN ON Tue Mar 11 11:59:43 2008      RUN LABEL= 
 CRUST MODEL  1: 1. SOUTH & COASTAL NEW ENGLAND

  DATE     ORIGIN    LAT N    LONG W   DEPTH   MN  MC  ML GAP   RMS  ERH  ERZ Q 
200803110310 30.97 41-26.31  72-29.01   2.86  2.0 2.3     233  0.18  0.9  1.1
CT, 2.0KM SW OF EAST HADDAM

 NSTA NPHS DMIN N.XMG N.FMG
  12  24  94.00   3   5

  STN  DIST AZM  RMK HRMN   SEC   TOBS   TCAL   RES   WT AMX PRX XMAG FMP FMAG ANG 
  YLE  39.0 250 EPC4  310 34.20   3.23   6.52 -3.29 0.00                        93
                 S 3  310 40.68   9.71  11.61 -1.90 0.00                      
 QUA2  94.0   6 EPC2  310 46.74  15.77  15.60  0.14 1.76 0.8 .09  2.0  69  2.2  91
                 S 3  310 58.50  27.53  27.77 -0.29 0.88                      
 BRYW  95.4  55 EPC2  310 46.73  15.76  15.84 -0.14 1.75 0.8 .14  2.1  91  2.4  91
                 S 3  310 58.54  27.57  28.20 -0.73 0.07                      
  WES 142.6  42 EPC1  310 54.21  23.24  23.17  0.06 2.39 0.3 .10  1.9  75  2.3  66
                 S 3  311 12.31  41.34  41.24  0.08 0.80                      
  BCX 147.6  47 EPC3  310 55.27  24.30  23.93  0.34 0.79               58  2.2  66
                 S 3  311 13.41  42.44  42.60 -0.21 0.79                      
  TRY 173.7 327 EPC3  310 58.93  27.96  27.70  0.21 0.73                        48
                 S 3  311 19.51  48.54  49.31 -0.86 0.00                      
  FFD 235.8  16 EPC4  311  4.02  33.05  35.37 -2.34 0.00                        48
                 S 4  311 37.53  66.56  62.96  3.57 0.00                      
  HNH 252.3   3 EPC3  311  8.74  37.77  37.41  0.33 0.53               78  2.5  48
                 S 4  311 39.08  68.11  66.59  1.47 0.00                      
 BINY 302.8 288 EPC2  311 14.29  43.32  43.65 -0.41 0.79                        48
                 S 4  311 46.56  75.59  77.70 -2.25 0.00                      
 LBNH 314.5   8 EPC2  311 15.82  44.85  45.09 -0.30 0.73                        48
                 S 4  311 50.11  79.14  80.26 -1.23 0.00                      
  NCB 315.6 334 EPC4  311 13.12  42.15  45.22 -3.17 0.00                        48
                 S 4  311 56.84  85.87  80.49  5.20 0.00                      
 LONY 392.7 335 EPC4  311 33.00  62.03  54.74  7.22 0.00                        48
                 S 4  312 17.20 106.23  97.44  8.67 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 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, 2008.

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Acknowledgments

Our map database has been developed in-house using ArcView and in part basemap data provided by ESRI, Inc., 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 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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