USGS WPhase Moment Solution

NEVADA

13/02/13  0:10:13

Epicenter:  38.032 -118.038
MW 5.2

USGS/WPHASE CENTROID MOMENT TENSOR
13/02/13 00:10:13.00
Centroid:   38.032 -118.038
Depth  11         No. of sta: 72
Moment Tensor;   Scale 10**16 Nm
  Mrr=-0.81       Mtt=-0.32
  Mpp= 1.13       Mrt= 1.19
  Mrp=-3.98       Mtp= 7.00
 Principal axes:
  T  Val=  8.02  Plg=15  Azm=128
  N     =  0.34      59       11
  P     = -8.37      25      225

Best Double Couple:Mo=8.2*10**16
 NP1:Strike=265 Dip=60 Slip=  -8
 NP2:       359     83      -150

Moment Tensor Solution
The figure above shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.

Moment Tensor Solution

Details on the W-phase inversion algorithm.