USGS Body-Wave Moment Tensor Solution


13/02/09 14:16:07.83

Epicenter:   1.134  -77.378
MW 6.9

Depth 149         No. of sta: 76
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.46       Mtt=-1.01
  Mpp= 0.55       Mrt=-1.07
  Mrp=-0.87       Mtp= 2.11
 Principal axes:
  T  Val=  2.79  Plg=30  Azm=127
  N       -0.25      59      289
  P       -2.53       8       32

Best Double Couple:Mo=2.7*10**19
 NP1:Strike=263 Dip=75 Slip=  28
 NP2:       166     63       164

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