USGS WPhase Moment Solution
NORTHEAST OF TAIWAN
11/11/08 2:59: 6 Epicenter: 27.291 125.867 MW 6.9 USGS/WPHASE CENTROID MOMENT TENSOR 11/11/08 02:59: 6.00 Centroid: 27.191 125.755 Depth 230 No. of sta:109 Moment Tensor; Scale 10**19 Nm Mrr=-2.58 Mtt= 0.09 Mpp= 2.49 Mrt=-0.78 Mrp=-1.07 Mtp=-0.65 Principal axes: T Val= 2.79 Plg= 9 Azm= 79 N = 0.26 17 172 P = -3.05 69 322 Best Double Couple:Mo=2.9*10**19 NP1:Strike=149 Dip=39 Slip=-119 NP2: 4 57 -68
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.
