USGS Centroid Moment Solution

NEAR S. COAST OF WESTERN HONSHU

13/04/12 20:33:17.58

Epicenter:  34.369  134.828
MW 5.8

USGS CENTROID MOMENT TENSOR
13/04/12 20:33:40.20
Centroid:  34.548  134.568
Depth  10         No. of sta: 46
Moment Tensor;   Scale 10**17 Nm
  Mrr= 4.84       Mtt=-0.45
  Mpp=-4.39       Mrt= 2.33
  Mrp=-1.74       Mtp= 0.90
 Principal axes:
  T  Val=  5.89  Plg=69  Azm= 22
  N       -0.78      15      159
  P       -5.11      13      252

Best Double Couple:Mo=5.5*10**17
 NP1:Strike=  2 Dip=34 Slip= 118
 NP2:       150     60        72

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