USGS WPhase Moment Solution

NEAR EAST COAST OF HONSHU, JAPAN

12/10/25 10:32:27.00

Epicenter:  38.305  141.732
MW 5.6

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/25 10:32:27.00
Centroid:   38.405  141.860
Depth  50         No. of sta: 16
Moment Tensor;   Scale 10**17 Nm
  Mrr= 2.58       Mtt=-0.75
  Mpp=-1.83       Mrt= 0.79
  Mrp= 2.09       Mtp=-0.97
 Principal axes:
  T  Val=  3.44  Plg=68  Azm=284
  N     = -0.20       4       26
  P     = -3.24      20      117

Best Double Couple:Mo=3.3*10**17
 NP1:Strike=216 Dip=24 Slip= 101
 NP2:        24     66        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.