USGS Centroid Moment Solution

COSTA RICA

12/09/05 14:42:07.55

Epicenter:   9.996  -85.318
MW 7.6

USGS CENTROID MOMENT TENSOR
12/09/05 14:42:35.40
Centroid:   9.972  -85.163
Depth  35         No. of sta: 156
Moment Tensor;   Scale 10**20 Nm
  Mrr= 1.93       Mtt=-1.23
  Mpp=-0.70       Mrt= 1.79
  Mrp=-1.16       Mtp= 0.79
 Principal axes:
  T  Val=  2.90  Plg=66  Azm= 32
  N       -0.14       1      124
  P       -2.76      24      215

Best Double Couple:Mo=2.8*10**20
 NP1:Strike=124 Dip=69 Slip=  89
 NP2:       307     21        93

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