USGS WPhase Moment Solution

OFFSHORE GUATEMALA

12/11/ 7 16:35:50.00

Epicenter:  14.082  -91.916
MW 7.4

USGS/WPHASE CENTROID MOMENT TENSOR
12/11/ 7 16:35:50.00
Centroid:   14.182  -91.916
Depth  30         No. of sta: 68
Moment Tensor;   Scale 10**19 Nm
  Mrr= 9.96       Mtt=-8.23
  Mpp=-1.73       Mrt= 8.17
  Mrp=-6.97       Mtp= 3.94
 Principal axes:
  T  Val= 14.81  Plg=65  Azm= 50
  N     = -0.25       7      303
  P     =-14.56      23      209

Best Double Couple:Mo=1.5*10**20
 NP1:Strike=285 Dip=23 Slip=  70
 NP2:       126     69        98

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.