USGS Centroid Moment Solution

ANTOFAGASTA, CHILE

12/10/08 01:50:25.33

Epicenter: -21.777  -68.262
MW 5.8

USGS CENTROID MOMENT TENSOR
12/10/08 01:50:33.50
Centroid: -22.253  -67.437
Depth  99         No. of sta: 32
Moment Tensor;   Scale 10**17 Nm
  Mrr=-5.80       Mtt=-0.65
  Mpp= 6.45       Mrt= 0.20
  Mrp=-2.15       Mtp= 0.04
 Principal axes:
  T  Val=  6.81  Plg=10  Azm= 90
  N       -0.64       2      360
  P       -6.17      80      258

Best Double Couple:Mo=6.5*10**17
 NP1:Strike=358 Dip=55 Slip= -93
 NP2:       183     35       -86

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