USGS Body-Wave Moment Tensor Solution

COSTA RICA

12/09/08 20:29:31.22

Epicenter:  10.073  -85.342
MW 5.6

USGS MOMENT TENSOR SOLUTION
Depth  23         No. of sta: 41
Moment Tensor;   Scale 10**17 Nm
  Mrr= 2.42       Mtt= 0.09
  Mpp=-2.52       Mrt=-0.02
  Mrp= 0.38       Mtp= 2.03
 Principal axes:
  T  Val=  2.47  Plg=82  Azm=308
  N        1.18       8      152
  P       -3.65       3       61

Best Double Couple:Mo=3.2*10**17
 NP1:Strike=339 Dip=49 Slip= 100
 NP2:       143     42        79

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