USGS Centroid Moment Solution


12/09/30 16:31:37.00

Epicenter:   1.953  -76.340
MW 7.2

12/09/30 16:31:58.70
Centroid:   2.051  -75.441
Depth 147         No. of sta: 148
Moment Tensor;   Scale 10**19 Nm
  Mrr=-7.38       Mtt= 7.28
  Mpp= 0.10       Mrt=-2.78
  Mrp= 0.78       Mtp= 4.08
 Principal axes:
  T  Val=  9.42  Plg= 8  Azm=157
  N       -1.23      16      249
  P       -8.20      73       42

Best Double Couple:Mo=8.8*10**19
 NP1:Strike= 81 Dip=55 Slip= -71
 NP2:       229     40      -115

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