USGS WPhase Moment Solution

12/02/13 21:07:02

Epicenter:  41.153 -123.817
MW 5.7

USGS/WPHASE CENTROID MOMENT TENSOR
12/02/13 21:07: 2.00
Centroid:   41.353 -123.684
Depth  30         No. of sta: 17
Moment Tensor;   Scale 10**17 Nm
  Mrr=-2.62       Mtt= 0.43
  Mpp= 2.19       Mrt= 2.58
  Mrp= 2.05       Mtp= 1.38
 Principal axes:
  T  Val=  4.34  Plg=24  Azm=305
  N     = -0.03      12       41
  P     = -4.31      62      156

Best Double Couple:Mo=4.3*10**17
 NP1:Strike= 11 Dip=23 Slip=-122
 NP2:       226     71       -76

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.