USGS WPhase Moment Solution

NEAR EAST COAST OF HONSHU, JAPAN

11/08/19  5:36:32

Epicenter:  37.673  141.716
MW 6.2

USGS/WPHASE CENTROID MOMENT TENSOR
11/08/19 05:36:32.00
Centroid:   37.573  141.842
Depth  45         No. of sta: 80
Moment Tensor;   Scale 10**18 Nm
  Mrr= 2.60       Mtt=-0.60
  Mpp=-2.00       Mrt= 0.35
  Mrp=-0.05       Mtp=-0.41
 Principal axes:
  T  Val=  2.64  Plg=83  Azm= 11
  N     = -0.52       6      195
  P     = -2.11       0      105

Best Double Couple:Mo=2.4*10**18
 NP1:Strike=189 Dip=45 Slip=  81
 NP2:        22     46        99

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.