USGS WPhase Moment Solution

SOUTH SANDWICH ISLANDS REGION

13/ 3/19  3:29:0.00

Epicenter: -58.915  -24.409
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 3/19  3:29: 0.00
Centroid:  -58.815  -24.215
Depth  40         No. of sta: 34
Moment Tensor;   Scale 10**18 Nm
  Mrr= 0.70       Mtt=-0.64
  Mpp=-0.06       Mrt=-0.27
  Mrp= 0.50       Mtp= 0.47
 Principal axes:
  T  Val=  0.95  Plg=64  Azm=266
  N     =  0.09      19      129
  P     = -1.04      16       33

Best Double Couple:Mo=1.0*10**18
 NP1:Strike= 96 Dip=34 Slip=  52
 NP2:       319     64       112

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.