Data Report
Bulletin / Jan/Feb 2002
Contributed by IGIL
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Dear Sirs
Herewith we are sending you our January to February
2002, bulletin.
The general bulletin information can be found in file bul_Nov_2001.txt
Yours sincerely
IIC
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Instituto Geofisico do Infante D.Luiz
Universidade de Lisboa
R. Escola Politecnica, 58
1269-102 Lisboa
Portugal
e-mail: sisigidl@fc.ul.pt
www.igidl.ul.pt/boletimsismico.htm
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Geophysical Institute Infante D. Luiz,
University of Lisbon
R. Escola Politecnica 58
1269-102 Lisboa
Portugal
Tel : +351-213921867/2/6
Fax : +351-213953327
E-Mail : sisigidl@fc.ul.pt
GENERAL BULLETIN INFORMATION
Since January 2001 the Seismological Bulletin from the Instituto Geofisico do Infante D. Luiz (IGIDL)
seismic network is processed with the SEISAN analyses system and available in digital form
(under request) or at the IGIDL web site
(www.igidl.ul.pt/boletimsismico).
The location program currently used for locating earthquakes is Hypocenter (Lienert et al.,1986). Plane parallel
layers are assumed for local and regional events, while the IASPEI travel time tables are used for distant events.
Models Used:
General events (published by Havskov and Bungum (1987)).
P-wave velocity (km/sec) depth to top of layer (km)
6.2 0.0
6.6 12.0
7.1 23.0
8.05 31.0
8.25 50.0
8.5 80.0
Events with epicenter in Iberian Peninsula (Land) - IGN Model
P-wave velocity (km/sec) depth to top of layer (km)
6.1 0.0
6.4 11.0
6.9 24.0
8.0 31.0
8.5 90.0
Events with epicenter near ocidental Coast of Iberian Peninsula, Cadiz Golf and Gorringe Bank - IMG Model
P-wave velocity (km/sec) depth to top of layer (km)
6.1 0.0
6.4 11.0
6.9 24.0
8.2 31.0
8.5 90.0
Events with epicenter in Atlantic Ocean with Long>10W and Lat>37N - GSM Model
P-wave velocity (km/sec) depth to top of layer (km)
5.15 0.0
6.8 1.5
7.5 5.0
8.15 10.0
8.5 90.0
Magnitudes are calculated from coda duration and/or amplitudes. The coda wave magnitude
is estimated via the formula (Engell-Sorensen,personal communication):
MC = -0.87 + 2.0 log(CT) + 0.0035 D.
where CT is the coda duration (sec) and D is the epicentral distance (km).
If instrument corrected maximum ground amplitudes A(nm) are available, local magnitude ML is
calculated by the following formula :
ML = 1.0 log(A) + 1.47 log(D) + 0.00022 D - 2.515
where D is the hypocentral distance (km).
MB is calculated using
MB = log(amp/T) + Q(dist,depth)
Where T is the period (sec) and Q is a function of depth and distance (dist).
MS is calculated using the standard
MS = log(amp/T) + 1.66 log(dist) + 3.3
Where distance (dist) is in degrees, amplitude (amp) is in micra.
MW = 2/3 log (moment) - 6.06
moment = 4 pi DE V**3 OM G KK
Where DE is density (g/cm**3); V is the seismic wave velocity at the source (P or S if P or S-spectrum respectively);
OM is the spectral flat level on the displacement spectrum;
G (r,h) = 1/r for r < 100 km
G (r,h) = 1/sqr(100 r) for r > 100 km
and KK = 1/(2.0 x 0.6)
All available amplitudes and coda values are used for magnitude calculations. No station corrections are used for
either travel times or magnitudes calculations. The Vp/Vs velocity ratio used in both layered models above is 1.73.
As a general policy, neither depths nor epicenters are fixed unless stated since this might restrict later
use of the data. As a consequence, some event locations might be unrealistic like zero depth earthquakes
around Jan Mayen or teleseismic locations off by 1000 km. However, the locations are based on the available
data and reflect the location procedure and the models used.
STATIONS USED
The stations listed below are those operated by the Institute of Geophysics Infante D. Luis,
University of Lisbon (UL).
Lisboa (IGIDL)
GGNV
Latitude 38.7165N
Longitude 9.1491W
Height 77m
Aquisition System RefTek
Time system GPS
Seismometer Guralp CMG-40T
0.033Hz to 50Hz
Transduction Constant 2*400 V/m/s
Almeirim (Fazendas)
ALMR
Latitude 39.1554N
Longitude 8.5768W
Height 165m
Aquisition System RefTek
Time system GPS
Seismometer Mark 3D Period 1s
Transduction Constant 130 V/m/s
Marmelete (Picos)
MORF
Latitude 37.3063N
Longitude 8.6508W
Height 650m
Aquisition System RefTek
Time system GPS
Seismometer Mark 3D Period 1s
Transduction Constant 130 V/m/s
MACROSEISMIC DATA
Macroseismic data, if available, are included in the bulletin.
Bulletin Abbreviations:
TIME: Origin time in UTC (hr. min. and sec.) or data file onset
time if event is not located.
LAT: Latitude of epicenter
LON: Longitude of epicenter
DEPTH: Focal depth in kilometer (trailing F indicates fixed depth)
AGENCY: Hypocenter reporting agency e.g. IGL (Lisboa)
MAGNITUDES: Up to 3 different magnitudes can be given followed by type and
and reporting agency, e.g. 3.1 MC IGL - coda magnitude calculated
in Lisboa.
RMS: Root mean square value of travel time residuals
STAT: Station code
CO: Component,S:short period,L:long period,B:broadband,
DIST: Epicenter distance (km)
AZI: Azimuth from source to station
PHAS: Phase; The first letter characterizes onset E(mergent) or
I(mpulsive)
P: Polarity ( C for compression, D for dilatation )
HR: Hour
MN: Minute
SECON: Seconds
TRES: Residual (seconds)
CODA: Signal duration in seconds
AMPL: Ground Amplitude (0.5*(peak to peak)), (nm) at period PERI
PERI: Period where amplitude is measured
BAZ: Back azimuth (station to event)
ARES: Back azimuth residual
VELO: Apparent phase velocity (km/sec)
WT: Weight of phase in the location
*: An asterix before the phase arrival time implies a potential
timing error. If an S phase is read, differential
S-P times will be used in the hypocenter location.
F: Fixed
NET: Fixed epicenter data network name
References:
Alsaker, A., Kvamme, L.B., Hansen, R.A., Dahle, A. and Bungum, H. (1991).
The ML scale in Norway. Bull. Seism. Soc. Am., 81,
pp. 379-398.
Havskov, J. and Bungum, H. (1987).
Source parameters for earthquakes in the northern North Sea,
Norsk Geologisk Tidskrift.
67, pp.51-58.
Lienert, B.R., Berg, E. and Frazer, L.N.(1986).
Hypocenter: An earthquake location method using centered, scaled,
and adaptively least squares. Bull. Seism. Soc. Am., 76.,
pp 771-783.
More information can be obtained on our website www.igidl.ul.pt
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2002 1 2 1722 49.92D -17.500 167.900 2.1 FIGL 1 0.1 7.7SIGL 1
Bul: VANUATU ISLANDS Net: IRIS 3
GAP=360 50.59 999.9 999.9 0.0 -0.1131E+09 0.0000E+00 0.0000E+00E
ACTION:UP 02-01-08 08:15 OP:ilid STATUS: ID:20020102171845 I
02010217.ggn 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BN ES 1749 55.20 -0.11017662 354
GGNV BZ EP 1742 48.54 0.11017662 354
GGNV BZ I 1857 6.36 11.8e4 21.7 17662 354
2002 1 3 0705 25.3 D 36.000 70.900120.0FFIGL 1 0.2 6.2BIGL 1
Bul: HINDU RUSH, AFGHANISTAN REGION Net: CSEM 3
GAP=360 39.17 999.9 999.9 0.0 0.1914E+09 0.0000E+00 0.0000E+00E
ACTION:UP 02-01-07 14:14 OP:ilid STATUS: ID:20020103070433 I
02010307.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BZ EP 715 30.93 0.210 6860 299
GGNV BZ I 715 35.40 646.7 0.91 6860 299
GGNV BN ES 723 44.36 -0.210 6860 299
GGNV BE ES 723 45.94 6860 299
2002 1 3 0000 30.1 D -17.770 168.030 1.6 FIGL 1 0.2 6.9SIGL 1
Bul:VANUATU ISLANDS Net: IRIS 3
GAP=360 42.26 999.9 999.9196.3 -0.4278E+09 -0.1235E+07 0.1089E+08E
ACTION:UP 02-01-08 10:29 OP:ilid STATUS: ID:20020103101553 I
02010310.ggn 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BZ EsPKPdf 1037 29.98 0.11017693 354
GGNV BE ESKPdf 1041 2.29 -0.31017693 354
GGNV BN ESKSdf 1044 36.20 0.21017693 354
GGNV BE I 12 2 36.37 13528.0 14.8 17693 354
2002 110 1114 56.4 D -3.250 142.470 0.1 FIGL 1 0.3 6.9SIGL 1
Bul: NEAR NORTH COAST OF NEW GUINEA Net: IRIS 3
GAP=360 44.94 999.9 999.9999.9 0.1305E+09 0.3172E+07 -0.4967E+07E
ACTION:UP 02-01-11 10:17 OP:ilid STATUS: ID:20020110111201 I
02011011.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BN ESS 1155 3.61 0.11015166 327
GGNV BN I 1236 22.18 23928.6 22.9 15166 327
GGNV BZ EPdiff 1131 23.55 -0.51015166 327
GGNV BZ EPP 1137 0.18 0.21015166 327
2002 112 0101 26.8 R 36.700 -7.117 0.6 FIGL 1 0.0 3.5LIGL 1
Bul: STRAIT OF GIBRALTAR Net: IMP 3
GAP=360 37.15 836.6 999.9 0.0 0.4160E+06 0.0000E+00 0.0000E+00E
ACTION:UP 02-01-14 11:21 OP:ilid STATUS: ID:20020112005755 I
02011200.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BE ES 1 2 37.68 0.010 287 322
GGNV BN ES 1 2 37.98 287 322
GGNV BN I 1 2 41.86 237.2 0.34 287 322
GGNV BZ EP 1 2 7.75 0.010 287 322
2002 113 1410 45.1 D -5.630 150.940 2.1 FIGL 1 2.1 6.1SIGL 1
Bul: NEW BRITAIN REGION Net: IRIS 3
GAP=360 55.30 999.9 999.9999.9 0.1365E+09 0.1034E+07 -0.2118E+07E
ACTION:UP 02-01-15 09:39 OP:ilid STATUS: ID:20020113140834 I
02011314.ggn 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BN ESdiff 1442 2.44 2.11015856 334
GGNV BE ESS 1452 1.64 -2.91015856 334
GGNV BN ESS 1452 2.40 15856 334
GGNV BE I 1537 53.13 4132.3 23.3 15856 334
GGNV BZ EPdiff 1427 40.63 0.71015856 334
2002 114 0443 4.7 D 44.800 -31.800 0.1 FIGL 1 0.5 4.0SIGL 1
Bul: NORTHERN MID_ATLANTIC RIDGE Net: IRIS 3
GAP=360 23.48 999.9 999.9 0.0 0.4550E+07 0.0000E+00 0.0000E+00E
ACTION:UP 02-01-15 09:58 OP:ilid STATUS: ID:20020114043941 I
02011404.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BZ EPn 447 14.93 -0.510 1993 102
GGNV BN ESn 450 37.56 1993 102
GGNV BE ESn 450 37.56 0.510 1993 102
GGNV BE I 452 13.01 787.4 20.8 1993 102
2002 116 2309 41.6 D 15.630 -93.141 80.0FFIGL 1 2.5 6.1SIGL 1
Bul: NEAR COAST OF CHIAPAS, MEXICO Net: CSEM 3
GAP=360 5.98 999.9 999.9 0.0 -0.5148E+07 0.0000E+00 0.0000E+00E
ACTION:UP 02-01-17 11:55 OP:ilid STATUS: ID:20020116230740 I
02011623.ggn 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BZ EPcP 2321 33.61 2.510 8434 53
GGNV BE ES 2330 52.69 -2.510 8434 53
GGNV BN ES 2330 54.25 8434 53
GGNV BZ I 2348 42.12 10983.8 23.1 8434 53
2002 117 0218 42.22R 36.733 -5.783 1.6 FIGL 1 0.3 4.7LIGL 1
Bul: STRAIT OF GIBRALTAR Net: IMP 3
GAP=360 23.12 752.3 800.3 0.0 0.3588E+06 0.0000E+00 0.0000E+00E
ACTION:UP 02-01-17 11:13 OP:ilid STATUS: ID:20020117021900 I
02011702.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BZ EPn 219 33.43 0.310 369 308
GGNV BE ESn 220 9.98 -0.310 369 308
GGNV BN ESn 220 10.08 369 308
GGNV BN I 220 32.92 2084.3 0.45 369 308
2002 122 0453 51.4 D 35.700 26.800 60.1FFIGL 1 0.0 5.7SIGL 1
GAP=360 53.25 999.9 999.9 0.0 0.6828E+08 0.0000E+00 0.0000E+00E
Bul: CRETE, GREECE Net: CSEM 3
ACTION:UP 02-01-22 10:25 OP:ilid STATUS: ID:20020122045036 I
02012204.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BE ES 5 4 27.93 0.010 3189 287
GGNV BN ES 5 4 28.10 3189 287
GGNV BN I 5 7 53.64 11816.9 11.8 3189 287
GGNV BZ EP 459 42.55 0.010 3189 287
2002 2 3 0711 31.3 D 38.200 30.900 2.1 FIGL 1 0.4 6.5SIGL 1
Bul: TURKEY Net: CSEM 3
GAP=360 35.67 999.9 999.9 0.0 0.3044E+08 0.0000E+00 0.0000E+00E
ACTION:UP 02-02-04 11:18 OP:ilid STATUS: ID:20020203070749 I
02020307.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BN ES 722 59.28 -0.410 3468 284
GGNV BE ES 722 59.43 3468 284
GGNV BN I 730 57.42 93812.6 18.2 3468 284
GGNV BZ EP 717 52.22 0.410 3468 284
2002 2 3 0926 44.6 D 38.600 30.900 0.1 FIGL 1 0.7 5.4SIGL 1
Bul: TURKEY Net: CSEM 3
GAP=360 15.74 999.9 987.5 0.0 -0.2397E+07 0.7525E+12 -0.1359E+12E
ACTION:UP 02-02-04 11:32 OP:ilid STATUS: ID:20020203092346 I
02020309.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BZ EP 933 4.19 -0.510 3458 283
GGNV BN ES 938 11.72 -0.410 3458 283
GGNV BE ES 938 13.10 0.910 3458 283
GGNV BN I 949 22.60 5980.7 15.3 3458 283
2002 2 4 2009 32.4 R 37.100 -2.600 0.1 FIGL 1 0.0 4.6LIGL 1
GAP=360 30.80 999.9 999.9 0.0 0.1703E+07 0.0000E+00 0.0000E+00E
Bul: SPAIN Net: IMP 3
ACTION:UP 02-02-26 11:08 OP:ilid STATUS: ID:20020204200824 I
02020420.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BZ EP 2010 52.20 0.010 603 289
GGNV BZ I 2010 57.48 485.3 1.14 603 289
GGNV BN ES 2011 50.56 0.010 603 289
GGNV BE ES 2011 50.63 603 289
GGNV BN I 2011 56.51 1217.2 0.86 603 289
2002 221 1022 17.21R 42.900 -1.267 0.1 FIGL 1 1.0 4.4SIGL 1
GAP=360 26.55 999.9 999.9 0.0 -0.4869E+07 0.0000E+00 0.0000E+00E
Bul: SPAIN Net: MAD 3
ACTION:UP 02-02-28 09:21 OP:ilid STATUS: ID:20020221102050 I
02022110.GGN 6
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
GGNV BZ EP 1024 2.90 -1.010 811 238
GGNV BN ES 1025 22.88 1.010 811 238
GGNV BE ES 1025 23.49 811 238
GGNV BE I 1029 32.29 9375.4 18.7 811 238
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