The ANSS event ID is usp0002vyk and the event page is at https://earthquake.usgs.gov/earthquakes/eventpage/usp0002vyk/executive.
1986/07/12 08:19:39 40.537 -84.371 10 4.40 Ohio
USGS/SLU Moment Tensor Solution ENS 1986/07/12 08:19:39:0 40.537 -84.371 10.0 4.4 Ohio Stations used: Filtering commands used: Best Fitting Double Couple Mo = 5.01e+22 dyne-cm Mw = 4.40 Z = 4 km Plane Strike Dip Rake NP1 288 80 -10 NP2 20 80 -170 Principal Axes: Axis Value Plunge Azimuth T 5.01e+22 0 334 N 0.00e+00 76 65 P -5.01e+22 14 244 Moment Tensor: (dyne-cm) Component Value Mxx 3.16e+22 Mxy -3.82e+22 Mxz 5.26e+21 Myy -2.86e+22 Myz 1.06e+22 Mzz -2.98e+21 ############## T ################---- ## ################------- ######################-------- #######################----------- ########################------------ ########################-------------- --#######################--------------- -------------###########---------------- ---------------------####----------------- ------------------------##---------------- -----------------------########----------- -----------------------############------- ---------------------################--- -- ---------------#################### - P --------------#################### --------------################### ---------------################### ------------################## ----------################## -----################# ############## Global CMT Convention Moment Tensor: R T P -2.98e+21 5.26e+21 -1.06e+22 5.26e+21 3.16e+22 3.82e+22 -1.06e+22 3.82e+22 -2.86e+22 Details of the solution is found at http://www.eas.slu.edu/eqc/eqc_mt/MECH.NA/19860712081939/index.html |
STK = 20 DIP = 80 RAKE = -170 MW = 4.40 HS = 4
The NDK file is 19860712081939.ndk
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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 is the following:
Schwartz, S. Y., and D. H. Christensen (1988). The 12 July St. Marys, Ohio earthquake and recent seismicity in the Anna, Ohio seismogenic zone, Seism. Res. Letters 59,, 57-62.
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