USGS WPhase Moment Solution

SOUTH OF SUMBAWA, INDONESIA

12/11/21 16:46:39

Epicenter: -11.375  117.921
MW 5.4

USGS/WPHASE CENTROID MOMENT TENSOR
12/11/21 16:46:39.00
Centroid:  -11.575  118.023
Depth  23         No. of sta: 15
Moment Tensor;   Scale 10**17 Nm
  Mrr=-1.52       Mtt= 1.56
  Mpp=-0.04       Mrt=-0.78
  Mrp= 0.01       Mtp=-0.32
 Principal axes:
  T  Val=  1.80  Plg=13  Azm=190
  N     = -0.09       4       99
  P     = -1.71      76      351

Best Double Couple:Mo=1.8*10**17
 NP1:Strike=286 Dip=32 Slip= -81
 NP2:        96     58       -95

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.