USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/28 18: 7:46.00

Epicenter: -10.926  165.909
MW 5.8

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/28 18: 7:46.00
Centroid:  -10.826  165.603
Depth  23         No. of sta: 49
Moment Tensor;   Scale 10**17 Nm
  Mrr= 5.85       Mtt=-1.47
  Mpp=-4.38       Mrt= 0.18
  Mrp= 0.42       Mtp= 1.79
 Principal axes:
  T  Val=  5.88  Plg=86  Azm=307
  N     = -0.64       3      154
  P     = -5.24       1       64

Best Double Couple:Mo=5.6*10**17
 NP1:Strike=152 Dip=43 Slip=  86
 NP2:       338     47        94

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.