USGS Body-Wave Moment Tensor Solution

OFF THE COAST OF OREGON

12/04/11 22:41:49.16

Epicenter:  43.623 -127.514
MW 5.7

USGS MOMENT TENSOR SOLUTION
Depth  12         No. of sta: 28
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.68       Mtt=-3.56
  Mpp= 2.88       Mrt= 0.42
  Mrp=-1.42       Mtp=-2.99
 Principal axes:
  T  Val=  4.61  Plg=21  Azm= 69
  N        0.13      69      244
  P       -4.74       1      338

Best Double Couple:Mo=4.7*10**17
 NP1:Strike=205 Dip=77 Slip=  16
 NP2:       112     75       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