USGS WPhase Moment Solution

GUERRERO, MEXICO

11/12/11  1:47:26.00

Epicenter:  18.038  -99.795
MW 6.5

USGS/WPHASE CENTROID MOMENT TENSOR
11/12/11  1:47:26.00
Centroid:   18.038  -99.690
Depth  60         No. of sta: 54
Moment Tensor;   Scale 10**18 Nm
  Mrr=-5.96       Mtt= 5.56
  Mpp= 0.40       Mrt=-2.75
  Mrp=-0.01       Mtp=-1.31
 Principal axes:
  T  Val=  6.45  Plg=12  Azm=192
  N     =  0.14       5      101
  P     = -6.59      76      348

Best Double Couple:Mo=6.5*10**18
 NP1:Strike=289 Dip=33 Slip= -80
 NP2:        98     57       -96

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.