USGS Centroid Moment Solution


13/02/09 14:16:09.01

Epicenter:   1.166  -77.384
MW 6.9

13/02/09 14:16:30.29
Centroid:   1.506  -76.491
Depth 119         No. of sta:136
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.09       Mtt=-0.47
  Mpp= 0.56       Mrt=-0.96
  Mrp=-1.03       Mtp= 3.01
 Principal axes:
  T  Val=  3.63  Plg=21  Azm=130
  N       -0.61      69      306
  P       -3.01       1       40

Best Double Couple:Mo=3.3*10**19
 NP1:Strike=267 Dip=77 Slip=  16
 NP2:       173     74       166

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