The ANSS event ID is usp0000v35 and the event page is at https://earthquake.usgs.gov/earthquakes/eventpage/usp0000v35/executive.
1978/06/16 11:46:53 33.03 -100.766 10 4.51 Texas
USGS/SLU Moment Tensor Solution ENS 1978/06/16 11:46:53:0 33.030 -100.766 10.0 4.5 Texas Stations used: Filtering commands used: Best Fitting Double Couple Mo = 7.33e+22 dyne-cm Mw = 4.51 Z = 3 km Plane Strike Dip Rake NP1 260 60 -60 NP2 31 41 -131 Principal Axes: Axis Value Plunge Azimuth T 7.33e+22 10 329 N 0.00e+00 26 64 P -7.33e+22 62 219 Moment Tensor: (dyne-cm) Component Value Mxx 4.25e+22 Mxy -3.92e+22 Mxz 3.44e+22 Myy 1.25e+22 Myz 1.25e+22 Mzz -5.50e+22 ############## ################### ### T ####################-- #### #####################-- ##############################---- ################################---- #################################----- ##############--------------------#----- #########-------------------------#####- #######----------------------------####### #####-----------------------------######## ###-------------------------------######## #--------------------------------######### ------------- ---------------######### ------------- P --------------########## ------------ -------------########## -------------------------########### -----------------------########### ------------------############ --------------############## ------################ ############## Global CMT Convention Moment Tensor: R T P -5.50e+22 3.44e+22 -1.25e+22 3.44e+22 4.25e+22 3.92e+22 -1.25e+22 3.92e+22 1.25e+22 Details of the solution is found at http://www.eas.slu.edu/eqc/eqc_mt/MECH.NA/19780616114653/index.html |
STK = 260 DIP = 60 RAKE = -60 MW = 4.51 HS = 3
The NDK file is 19780616114653.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:
Voss, J. A. and R. B. Herrmann (1980). A surface wave study of the June 16, 1978 Texas earthquake, Earthquake Notes 51, 3-14.
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