USGS Body-Wave Moment Tensor Solution

NEAR S. COAST OF WESTERN HONSHU

13/04/12 20:33:17.58

Epicenter:  34.369  134.828
MW 5.7

USGS MOMENT TENSOR SOLUTION
Depth  16         No. of sta: 85
Moment Tensor;   Scale 10**17 Nm
  Mrr= 3.77       Mtt= 1.03
  Mpp=-4.80       Mrt= 0.24
  Mrp=-2.33       Mtp= 0.56
 Principal axes:
  T  Val=  4.36  Plg=76  Azm= 83
  N        1.08       0      174
  P       -5.44      14      265

Best Double Couple:Mo=5.0*10**17
 NP1:Strike=355 Dip=31 Slip=  91
 NP2:       174     59        90

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