The ANSS event ID is usp0008a5s and the event page is at https://earthquake.usgs.gov/earthquakes/eventpage/usp0008a5s/executive.
1997/11/06 02:34:33 46.800 -71.410 22.5 4.38 Quebec, Canada
USGS/SLU Moment Tensor Solution ENS 1997/11/06 02:34:33:0 46.800 -71.410 22.5 4.4 Quebec, Canada Stations used: Filtering commands used: Best Fitting Double Couple Mo = 4.68e+22 dyne-cm Mw = 4.38 Z = 21 km Plane Strike Dip Rake NP1 45 70 85 NP2 239 21 103 Principal Axes: Axis Value Plunge Azimuth T 4.68e+22 65 307 N 0.00e+00 5 47 P -4.68e+22 25 139 Moment Tensor: (dyne-cm) Component Value Mxx -1.88e+22 Mxy 1.50e+22 Mxz 2.43e+22 Myy -1.11e+22 Myz -2.62e+22 Mzz 3.00e+22 -------------- ---------------------- --------#################--- ------#######################- -----##########################--# ----###########################----- ----############################------ ----######### ################-------- ---########## T ##############---------- ---########### #############------------ --###########################------------- --#########################--------------- --#######################----------------- -######################----------------- -####################------------------- #################--------------------- ##############------------- ------ ##########---------------- P ----- ###--------------------- --- ---------------------------- ---------------------- -------------- Global CMT Convention Moment Tensor: R T P 3.00e+22 2.43e+22 2.62e+22 2.43e+22 -1.88e+22 -1.50e+22 2.62e+22 -1.50e+22 -1.11e+22 Details of the solution is found at http://www.eas.slu.edu/eqc/eqc_mt/MECH.NA/19971106023433/index.html |
STK = 45 DIP = 70 RAKE = 85 MW = 4.38 HS = 21
The NDK file is 19971106023433.ndk
The following compares this source inversion to those provided by others. The purpose is to look for major differences and also to note slight differences that might be inherent to the processing procedure. For completeness the USGS/SLU solution is repeated from above.
USGS/SLU Moment Tensor Solution ENS 1997/11/06 02:34:33:0 46.800 -71.410 22.5 4.4 Quebec, Canada Stations used: Filtering commands used: Best Fitting Double Couple Mo = 4.68e+22 dyne-cm Mw = 4.38 Z = 21 km Plane Strike Dip Rake NP1 45 70 85 NP2 239 21 103 Principal Axes: Axis Value Plunge Azimuth T 4.68e+22 65 307 N 0.00e+00 5 47 P -4.68e+22 25 139 Moment Tensor: (dyne-cm) Component Value Mxx -1.88e+22 Mxy 1.50e+22 Mxz 2.43e+22 Myy -1.11e+22 Myz -2.62e+22 Mzz 3.00e+22 -------------- ---------------------- --------#################--- ------#######################- -----##########################--# ----###########################----- ----############################------ ----######### ################-------- ---########## T ##############---------- ---########### #############------------ --###########################------------- --#########################--------------- --#######################----------------- -######################----------------- -####################------------------- #################--------------------- ##############------------- ------ ##########---------------- P ----- ###--------------------- --- ---------------------------- ---------------------- -------------- Global CMT Convention Moment Tensor: R T P 3.00e+22 2.43e+22 2.62e+22 2.43e+22 -1.88e+22 -1.50e+22 2.62e+22 -1.50e+22 -1.11e+22 Details of the solution is found at http://www.eas.slu.edu/eqc/eqc_mt/MECH.NA/19971106023433/index.html |
Du et al (2003) 1997/11/06 02:34:30:0 46.800 -71.410 22.5 4.5 Best Fitting Double Couple Mo = 6.38e+22 dyne-cm Mw = 4.47 Z = 22 km Plane Strike Dip Rake NP1 39 63 87 NP2 226 27 96 Principal Axes: Axis Value Plunge Azimuth T 6.38e+22 72 302 N 0.00e+00 3 40 P -6.38e+22 18 131 Moment Tensor: (dyne-cm) Component Value Mxx -2.33e+22 Mxy 2.58e+22 Mxz 2.24e+22 Myy -2.82e+22 Myz -3.01e+22 Mzz 5.16e+22 -------------- ---------------------- -----------################# --------####################-- -------#######################---- -------########################----- ------#########################------- ------##########################-------- -----######### ##############--------- -----########## T #############----------- ----########### ############------------ ----#########################------------- ----########################-------------- ---######################--------------- ---####################----------------- --###################----------------- -#################----------- ---- -#############-------------- P --- #########----------------- - ###------------------------- ---------------------- -------------- Global CMT Convention Moment Tensor: R T P 5.16e+22 2.24e+22 3.01e+22 2.24e+22 -2.33e+22 -2.58e+22 3.01e+22 -2.58e+22 -2.82e+22 Details of the solution is found in Du et al (2003). |
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Older earthquake were studied using analog seismograms, which were digitized and analyzed. The original data are not longer available. However focal mechanism solutions based on the waveforms are given in published literature. At the same time, a given earthquake may have been analyzed independently, and the reference is given here.
For this earthquake the source reference for the Du solution is the following:
Du, Wen-xuan; Kim, Won-Young; Sykes, Lynn R. (2003). Earthquake Source Parameters and State of Stress for the Northeastern United States and Southeastern Canada from Analysis of Regional Seismograms, Bull. Seism. Soc. Am. 93, 1633 - 1648.
The CUS model used for the waveform synthetic seismograms and for the surface wave eigenfunctions and dispersion is as follows (The format is in the model96 format of Computer Programs in Seismology).
MODEL.01 CUS Model with Q from simple gamma values ISOTROPIC KGS FLAT EARTH 1-D CONSTANT VELOCITY LINE08 LINE09 LINE10 LINE11 H(KM) VP(KM/S) VS(KM/S) RHO(GM/CC) QP QS ETAP ETAS FREFP FREFS 1.0000 5.0000 2.8900 2.5000 0.172E-02 0.387E-02 0.00 0.00 1.00 1.00 9.0000 6.1000 3.5200 2.7300 0.160E-02 0.363E-02 0.00 0.00 1.00 1.00 10.0000 6.4000 3.7000 2.8200 0.149E-02 0.336E-02 0.00 0.00 1.00 1.00 20.0000 6.7000 3.8700 2.9020 0.000E-04 0.000E-04 0.00 0.00 1.00 1.00 0.0000 8.1500 4.7000 3.3640 0.194E-02 0.431E-02 0.00 0.00 1.00 1.00