USGS WPhase Moment Solution

NORTHERN PERU

12/11/28  3: 9:49.00

Epicenter:  -4.507  -76.051
MW 5.6

USGS/WPHASE CENTROID MOMENT TENSOR
12/11/28  3: 9:49.00
Centroid:   -4.507  -75.850
Depth 120         No. of sta: 55
Moment Tensor;   Scale 10**17 Nm
  Mrr=-3.20       Mtt=-0.02
  Mpp= 3.23       Mrt=-1.03
  Mrp=-0.48       Mtp=-0.87
 Principal axes:
  T  Val=  3.45  Plg= 1  Azm= 76
  N     =  0.13      18      167
  P     = -3.58      71      340

Best Double Couple:Mo=3.5*10**17
 NP1:Strike=148 Dip=46 Slip=-116
 NP2:         3     50       -65

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.