USGS WPhase Moment Solution

BANDA SEA

12/12/10 16:53:9.00

Epicenter:  -6.521  129.813
MW 7.1

USGS/WPHASE CENTROID MOMENT TENSOR
12/12/10 16:53: 9.00
Centroid:   -6.521  130.014
Depth 160         No. of sta: 70
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.99       Mtt=-4.22
  Mpp= 3.24       Mrt= 2.10
  Mrp= 3.43       Mtp= 0.27
 Principal axes:
  T  Val=  5.93  Plg=37  Azm=280
  N     = -0.85      43       57
  P     = -5.08      22      171

Best Double Couple:Mo=5.6*10**19
 NP1:Strike=310 Dip=45 Slip= 168
 NP2:        49     81        45

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.