This is a preliminary UCB moment tensor solution for the event 73
km W of Punta Gorda, CA (40.386N 125.279W; z=7.8km; ML=5.8; USGS/UCB
Joint Notification System) on March 16, 2000 at 15:19:56UTC. A average Mw5.8
and depth of 8 km were obtained from long-period waves recorded at
YBH, WDC, HOPS, and surface wave amplitude and phase spectra.
Best Fitting Double-Couple:
COMPLETE WAVEFORMS SURFACE WAVES
Mo = 4.52E+24 Dyne-cm 8.8e+24 dyne-cm
Mw = 5.74 5.9
Z = 8 km 8 km (restrained)
Plane Strike Rake Dip Strike Rake Dip
NP1 5 -18 82 359 -16 71
NP2 98 -172 72 94 -160 75
Principal Axes:
Axis Value Plunge Azimuth
T 4.520 7 52
N 0.000 70 162
P -4.520 18 320
Best regards,
Douglas Dreger
Hrvoje Tkalcic
Berkeley Seismological Laboratory
Berkeley COMPLETE WAVEFORM Moment Tensor Solution
Event Date/Time: prel
Moment Tensor: Scale = 10**24 Dyne-cm
Component Value
Mxx -0.736
Mxy 4.159
Mxz -0.713
Myy 1.121
Myz 1.285
Mzz -0.385
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Lower Hemisphere Equiangle Projection