. This is a preliminary UCB moment tensor solution for the event centered in
Bolinas, CA (37.91N 122.69W; Z=6.9; ML=5.0; USGS/UCB Joint Notification
System) on August 18, 1999 at 18:06:18UTC. An average Mw4.7 was obtasined
from long-period surface wave spectra and complete long-period waveforms.
A depth of 8 km was obtained from long period complete waveforms. This
event is a REVERSE mechanism parallel to the San Andreas Fault.
Best Fitting Double-Couple:
Complete Three-Comp Waveforms Surface Wave Amp and Phase Spectra
Mo = 7.25E+22 Dyne-cm 1.6e+23
Mw = 4.54 4.8
Z = 8 km 6 km
Plane Strike Rake Dip Strike Rake Dip
NP1 115 69 49 121 86 51
NP2 325 112 45 307 95 39
Principal Axes:
Axis Value Plunge Azimuth
T 7.250 74 317
N 0.000 16 129
P -7.250 2 220
Best regards,
Douglas Dreger
Hrvoje Tkalcic
UC Berkeley Seismological Laboratory
Berkeley Moment Tensor Solution
Event Date/Time: prel
Moment Tensor: Scale = 10**22 Dyne-cm
Component Value
Mxx -4.003
Mxy -3.828
Mxz 1.574
Myy -2.699
Myz -1.147
Mzz 6.703
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