This is a preliminary UCB moment tensor solution for the event located
10 km WSW of the Geysers, CA (38.757N 122.913W; Z=6.2 km; ML=4.3; USGS/UCB
Joint NOtification System) on January 10, 2000 at 21:41:27UTC. A Mw4.4
and depth of 5 km were obtained from long-period waves recorded at BKS,
JRSC and ORV. A combined Mw4.4 was obtained from the complete waveform
and surface spectra methods.
Best Fitting Double-Couple:
COMPLETE WAVEFORM SOLUTION SURFACE WAVE SOLUTION
Mo = 3.80E+22 Dyne-cm 5.6e+22
Mw = 4.35 4.5
Z = 5 km 6 km
Plane Strike Rake Dip Strike Rake Dip
NP1 262 -27 67 243 -18 46
NP2 3 -155 65 346 -135 77
Principal Axes:
Axis Value Plunge Azimuth
T 3.800 2 313
N 0.000 55 45
P -3.800 35 222
Best regards,
Douglas Dreger
Hrvoje Tkalcic
UCB Seismological Laboratory
Berkeley Moment Tensor Solution (COMPLETE WAVEFORMS)
Event Date/Time: prel
Moment Tensor: Scale = 10**22 Dyne-cm
Component Value
Mxx 0.330
Mxy -3.168
Mxz 1.399
Myy 0.901
Myz 1.107
Mzz -1.230
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#-------------------------###############
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--------- P -----------##############
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Lower Hemisphere Equiangle Projection