USGS WPhase Moment Solution

PHILIPPINE ISLANDS REGION

12/ 8/31 12:47:34.00

Epicenter:  10.827  126.677
MW 7.6

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 8/31 12:47:34.00
Centroid:   10.927  126.982
Depth  50         No. of sta:100
Moment Tensor;   Scale 10**20 Nm
  Mrr= 2.69       Mtt= 0.47
  Mpp=-3.16       Mrt=-0.85
  Mrp=-0.17       Mtp=-0.22
 Principal axes:
  T  Val=  2.98  Plg=71  Azm=177
  N     =  0.20      18        4
  P     = -3.18       2      273

Best Double Couple:Mo=3.1*10**20
 NP1:Strike=346 Dip=46 Slip=  64
 NP2:       201     50       114

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.