USGS Centroid Moment Solution

NEAR EAST COAST OF HONSHU, JAPAN

11/04/07 14:32:44.60

Epicenter:  38.255  141.632
MW 7.1

USGS CENTROID MOMENT TENSOR
11/04/07 14:33:01.50
Centroid:  38.457  141.660
Depth  51         No. of sta: 151
Moment Tensor;   Scale 10**19 Nm
  Mrr= 6.49       Mtt=-1.64
  Mpp=-4.85       Mrt=-1.02
  Mrp=-0.36       Mtp=-1.76
 Principal axes:
  T  Val=  6.61  Plg=83  Azm=174
  N       -0.94       6       25
  P       -5.67       4      294

Best Double Couple:Mo=6.1*10**19
 NP1:Strike= 18 Dip=42 Slip=  81
 NP2:       210     49        98

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 form 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