USGS WPhase Moment Solution

COLOMBIA

12/ 9/30 16:31:34.00

Epicenter:   1.968  -76.315
MW 7.3

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 9/30 16:31:34.00
Centroid:    1.868  -75.814
Depth 160         No. of sta: 99
Moment Tensor;   Scale 10**19 Nm
  Mrr=-7.86       Mtt= 8.04
  Mpp=-0.17       Mrt=-2.87
  Mrp= 0.54       Mtp= 4.59
 Principal axes:
  T  Val= 10.40  Plg= 7  Azm=156
  N     = -1.80      14      248
  P     = -8.60      73       39

Best Double Couple:Mo=9.6*10**19
 NP1:Strike=231 Dip=39 Slip=-112
 NP2:        79     54       -72

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.