USGS Centroid Moment Solution
HOKKAIDO, JAPAN REGION
13/02/02 14:17:34.85 Epicenter: 42.823 143.092 MW 6.9 USGS CENTROID MOMENT TENSOR 13/02/02 14:17:50.20 Centroid: 42.927 143.321 Depth 91 No. of sta: 95 Moment Tensor; Scale 10**19 Nm Mrr=-0.39 Mtt= 0.67 Mpp=-0.28 Mrt= 3.14 Mrp=-0.11 Mtp= 0.31 Principal axes: T Val= 3.33 Plg=40 Azm=357 N -0.25 6 92 P -3.07 49 189 Best Double Couple:Mo=3.2*10**19 NP1:Strike= 40 Dip= 8 Slip=-142 NP2: 272 85 -84
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.
