USGS WPhase Moment Solution

OFF W. COAST OF BAJA CALIFORNIA

12/12/14 10:36:1.00

Epicenter:  31.219 -119.550
MW 6.3

USGS/WPHASE CENTROID MOMENT TENSOR
12/12/14 10:36: 1.00
Centroid:   31.219 -119.667
Depth  15         No. of sta: 76
Moment Tensor;   Scale 10**18 Nm
  Mrr=-3.77       Mtt= 1.05
  Mpp= 2.73       Mrt= 0.65
  Mrp=-0.31       Mtp= 2.19
 Principal axes:
  T  Val=  4.23  Plg= 0  Azm=304
  N     = -0.31      11       34
  P     = -3.92      78      210

Best Double Couple:Mo=4.1*10**18
 NP1:Strike= 23 Dip=45 Slip=-106
 NP2:       226     47       -74

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.