USGS WPhase Moment Solution

CENTRAL MID-ATLANTIC RIDGE

13/02/18  3:40:49

Epicenter:   5.594  -32.943
MW 5.5

USGS/WPHASE CENTROID MOMENT TENSOR
13/02/18 03:40:49.00
Centroid:    5.794  -32.842
Depth  11         No. of sta: 17
Moment Tensor;   Scale 10**17 Nm
  Mrr=-2.06       Mtt=-0.21
  Mpp= 2.27       Mrt= 0.11
  Mrp= 0.29       Mtp=-0.08
 Principal axes:
  T  Val=  2.29  Plg= 3  Azm=268
  N     = -0.21       3      358
  P     = -2.08      84      131

Best Double Couple:Mo=2.2*10**17
 NP1:Strike=355 Dip=41 Slip= -95
 NP2:       182     49       -85

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.