USGS WPhase Moment Solution

BANDA SEA

12/10/ 8 11:43:35.00

Epicenter:  -4.442  129.165
MW 6.1

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/ 8 11:43:35.00
Centroid:   -4.442  129.466
Depth  11         No. of sta: 27
Moment Tensor;   Scale 10**18 Nm
  Mrr= 1.82       Mtt=-1.03
  Mpp=-0.80       Mrt= 0.34
  Mrp=-0.57       Mtp= 0.96
 Principal axes:
  T  Val=  1.95  Plg=78  Azm= 74
  N     =  0.03       5      313
  P     = -1.98       9      222

Best Double Couple:Mo=2.0*10**18
 NP1:Strike=305 Dip=36 Slip=  80
 NP2:       138     55        97

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.