USGS Body-Wave Moment Tensor Solution

ANTOFAGASTA, CHILE

12/10/08 01:50:25.81

Epicenter: -21.773  -68.298
MW 5.7

USGS MOMENT TENSOR SOLUTION
Depth 120         No. of sta: 53
Moment Tensor;   Scale 10**17 Nm
  Mrr=-3.51       Mtt= 0.26
  Mpp= 3.25       Mrt=-1.12
  Mrp=-3.47       Mtp=-0.06
 Principal axes:
  T  Val=  4.74  Plg=23  Azm= 95
  N        0.43       8      189
  P       -5.18      65      297

Best Double Couple:Mo=5.0*10**17
 NP1:Strike=169 Dip=23 Slip=-112
 NP2:        12     69       -81

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