USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/02/10 18:39:35

Epicenter: -10.978  165.444
MW 6.0

USGS/WPHASE CENTROID MOMENT TENSOR
13/02/10 18:39:35.00
Centroid:  -10.778  165.444
Depth  13         No. of sta: 31
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.69       Mtt= 1.00
  Mpp=-0.32       Mrt=-0.43
  Mrp=-0.38       Mtp=-0.32
 Principal axes:
  T  Val=  1.14  Plg=11  Azm=189
  N     = -0.08      33       91
  P     = -1.06      54      295

Best Double Couple:Mo=1.1*10**18
 NP1:Strike=314 Dip=45 Slip= -38
 NP2:        73     64      -127

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.