USGS WPhase Moment Solution

BANDA SEA

11/08/30  6:57:41

Epicenter:  -6.400  126.773
MW 6.9

USGS/WPHASE CENTROID MOMENT TENSOR
11/08/30 06:57:41.00
Centroid:   -6.400  126.773
Depth 480         No. of sta: 56
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.92       Mtt= 0.11
  Mpp= 0.81       Mrt= 0.73
  Mrp= 2.31       Mtp=-0.12
 Principal axes:
  T  Val=  2.46  Plg=35  Azm=279
  N     =  0.22       6       14
  P     = -2.69      53      113

Best Double Couple:Mo=2.6*10**19
 NP1:Strike=340 Dip=11 Slip=-125
 NP2:       195     81       -83

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.