This is a preliminary UCB moment tensor solution for the event 7 km NW of
Parkfield, CA (35.95N 120.50W; Z=10.6km; ML=4.0; USGS/UCB Joint Notification
System) on February 26, 1999 at 15:25:56.7UTC. A Mw4.0 and depth of 11 km
were obtained from long-period waves recorded by KCC, SAO and MHC.
Best Fitting Double-Couple:
Mo = 1.33E+22 Dyne-cm
Mw = 4.05
Z = 11 km
Plane Strike Rake Dip
NP1 148 174 88
NP2 238 2 84
Principal Axes:
Axis Value Plunge Azimuth
T 1.330 6 103
N 0.000 84 310
P -1.330 3 193
Best regards,
Douglas Dreger
UCB Seismological Laboratory
Berkeley Moment Tensor Solution
Event Date/Time: prel
Moment Tensor: Scale = 10**22 Dyne-cm
Component Value
Mxx -1.191
Mxy -0.584
Mxz 0.034
Myy 1.181
Myz 0.142
Mzz 0.010
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Lower Hemisphere Equiangle Projection