USGS Centroid Moment Solution
NORTHEAST OF TAIWAN
11/11/08 02:59:07.78 Epicenter: 27.274 125.774 MW 6.9 USGS CENTROID MOMENT TENSOR 11/11/08 02:59:26.70 Centroid: 27.557 125.840 Depth 223 No. of sta: 149 Moment Tensor; Scale 10**19 Nm Mrr=-2.29 Mtt= 0.02 Mpp= 2.27 Mrt=-0.85 Mrp=-1.08 Mtp=-0.45 Principal axes: T Val= 2.54 Plg=11 Azm= 84 N 0.30 19 178 P -2.84 67 324 Best Double Couple:Mo=2.7*10**19 NP1:Strike= 10 Dip=59 Slip= -68 NP2: 151 37 -123
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.
