USGS Centroid Moment Solution

COSTA RICA

12/09/08 20:29:31.22

Epicenter:  10.073  -85.342
MW 5.7

USGS CENTROID MOMENT TENSOR
12/09/08 20:29:13.20
Centroid:   7.920  -85.894
Depth  40         No. of sta: 5
Moment Tensor;   Scale 10**17 Nm
  Mrr= 4.20       Mtt=-1.98
  Mpp=-2.22       Mrt= 2.63
  Mrp=-0.17       Mtp= 2.08
 Principal axes:
  T  Val=  5.21  Plg=68  Azm=347
  N       -0.57      17      127
  P       -4.64      13      221

Best Double Couple:Mo=4.9*10**17
 NP1:Strike=117 Dip=60 Slip=  70
 NP2:       333     35       121

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