Hypocentral Location:

Event ID	21358975
Origin Time	2004/04/19 06:20:14
Latitude	40.3690
Longitude	-120.6325
Depth (TT)	-1.9 km
Depth (MT; not authoritative)	8 km

Magnitudes:

Md	3.65 (not authoritative)
Mw	3.66 (authoritative)

Principal Axes:

Scale	1.0E+21 Dyne-cm
Axis	Value	Plunge	Azimuth
T	3.746	12.817	262.487
N	0.118	75.597	110.127
P	-3.864	6.460	353.963

Source Composition:

Type	Percent
DC	94
CLVD	6
Iso	(null)

Moment Tensor (Aki & Richards Convention):

Mo	3.80e+21 Dyne-cm
Mxx	-3.711e+21 Dyne-cm
Mxy	8.584e+20 Dyne-cm
Mxz	-5.453e+20 Dyne-cm
Myy	3.465e+21 Dyne-cm
Myz	-7.314e+20 Dyne-cm
Mzz	2.457e+20 Dyne-cm
Variance Reduction	76%
Version number	1
Solution time	2009/10/21 05:13:54 UTC

Best-fit Double Couple Solution

Plane	Strike	Rake	Dip
NP1	308	166	86
NP2	39	5	76

Waveform data (solid line) and synthetic data (dashed line) from the moment tensor inversion: