USGS WPhase Moment Solution

SIMEULUE, INDONESIA

12/07/25  0:27:45

Epicenter:   2.657   96.126
MW 6.4

USGS/WPHASE CENTROID MOMENT TENSOR
12/07/25 00:27:45.00
Centroid:    2.157   95.825
Depth  17         No. of sta: 19
Moment Tensor;   Scale 10**18 Nm
  Mrr= 2.05       Mtt=-1.34
  Mpp=-0.71       Mrt= 3.28
  Mrp=-3.70       Mtp= 1.01
 Principal axes:
  T  Val=  5.38  Plg=55  Azm= 53
  N     = -0.04       4      316
  P     = -5.33      33      223

Best Double Couple:Mo=5.4*10**18
 NP1:Strike=296 Dip=12 Slip=  69
 NP2:       137     79        94

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.