USGS WPhase Moment Solution

SOUTH OF PANAMA

12/ 6/ 4  0:45:15.00

Epicenter:   5.287  -82.580
MW 6.3

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 6/ 4  0:45:15.00
Centroid:    5.387  -82.379
Depth  15         No. of sta: 28
Moment Tensor;   Scale 10**18 Nm
  Mrr= 0.21       Mtt= 0.72
  Mpp=-0.93       Mrt=-0.19
  Mrp=-0.41       Mtp= 2.90
 Principal axes:
  T  Val=  2.97  Plg= 8  Azm=142
  N     =  0.17      80      346
  P     = -3.14       3      233

Best Double Couple:Mo=3.1*10**18
 NP1:Strike=278 Dip=82 Slip=   3
 NP2:       188     87       172

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.