USGS WPhase Moment Solution

COLOMBIA

13/ 2/ 9 14:16:6.00

Epicenter:   1.142  -77.361
MW 6.9

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 9 14:16: 6.00
Centroid:    1.142  -77.361
Depth 150         No. of sta: 27
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.14       Mtt=-0.53
  Mpp= 0.39       Mrt=-0.88
  Mrp=-1.19       Mtp= 2.84
 Principal axes:
  T  Val=  3.46  Plg=23  Azm=129
  N     = -0.51      65      315
  P     = -2.95       2      220

Best Double Couple:Mo=3.2*10**19
 NP1:Strike=268 Dip=72 Slip=  16
 NP2:       173     75       161

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.