USGS WPhase Moment Solution

VANCOUVER ISLAND, CANADA REGION

11/ 9/ 9 19:41:35.00

Epicenter:  49.474 -126.974
MW 6.4

USGS/WPHASE CENTROID MOMENT TENSOR
11/ 9/ 9 19:41:35.00
Centroid:   49.674 -126.820
Depth  19         No. of sta: 79
Moment Tensor;   Scale 10**18 Nm
  Mrr=-1.68       Mtt=-1.28
  Mpp= 2.95       Mrt= 1.05
  Mrp=-1.81       Mtp= 3.89
 Principal axes:
  T  Val=  5.42  Plg= 8  Azm=118
  N     = -0.70      56       15
  P     = -4.72      31      214

Best Double Couple:Mo=5.1*10**18
 NP1:Strike=252 Dip=61 Slip= -17
 NP2:       351     75      -150

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

Details on the W-phase inversion algorithm.