USGS WPhase Moment Solution

12/09/30 16:31:31

Epicenter:   2.000  -76.600
MW 7.2

USGS/WPHASE CENTROID MOMENT TENSOR
12/09/30 16:31:31.00
Centroid:    2.100  -76.299
Depth 150         No. of sta: 19
Moment Tensor;   Scale 10**19 Nm
  Mrr=-7.37       Mtt= 6.40
  Mpp= 0.97       Mrt=-3.23
  Mrp= 1.46       Mtp= 3.60
 Principal axes:
  T  Val=  8.53  Plg= 8  Azm=156
  N     =  0.10      18      248
  P     = -8.63      69       42

Best Double Couple:Mo=8.6*10**19
 NP1:Strike=225 Dip=40 Slip=-119
 NP2:        82     56       -67

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.