USGS WPhase Moment Solution

NEAR COAST OF CENTRAL PERU

12/ 1/30  5:11:0.00

Epicenter: -14.178  -75.643
MW 6.4

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 1/30  5:11: 0.00
Centroid:  -14.278  -75.540
Depth  50         No. of sta: 26
Moment Tensor;   Scale 10**18 Nm
  Mrr= 2.90       Mtt=-0.78
  Mpp=-2.11       Mrt= 0.43
  Mrp=-3.78       Mtp= 1.33
 Principal axes:
  T  Val=  4.94  Plg=61  Azm= 95
  N     = -0.30      11      343
  P     = -4.63      25      248

Best Double Couple:Mo=4.8*10**18
 NP1:Strike=313 Dip=22 Slip=  57
 NP2:       167     72       102

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.