USGS WPhase Moment Solution

VIRGINIA

11/08/23 17:51: 3

Epicenter:  37.974  -77.968
MW 5.8

USGS/WPHASE CENTROID MOMENT TENSOR
11/08/23 17:51: 3.00
Centroid:   37.974  -77.715
Depth  11         No. of sta: 73
Moment Tensor;   Scale 10**17 Nm
  Mrr= 4.85       Mtt= 0.29
  Mpp=-5.13       Mrt= 1.03
  Mrp=-2.13       Mtp=-1.37
 Principal axes:
  T  Val=  5.60  Plg=71  Azm= 42
  N     =  0.19      15      188
  P     = -5.79      10      281

Best Double Couple:Mo=5.7*10**17
 NP1:Strike= 30 Dip=37 Slip= 117
 NP2:       177     57        71

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.