USGS Body-Wave Moment Tensor Solution
NORTHEAST OF TAIWAN
11/11/08 02:59:07.60 Epicenter: 27.278 125.772 MW 6.9 USGS MOMENT TENSOR SOLUTION Depth 227 No. of sta: 64 Moment Tensor; Scale 10**19 Nm Mrr=-2.25 Mtt= 0.09 Mpp= 2.17 Mrt=-0.78 Mrp=-1.10 Mtp= 0.01 Principal axes: T Val= 2.44 Plg=14 Azm= 95 N 0.28 14 188 P -2.72 70 321 Best Double Couple:Mo=2.6*10**19 NP1:Strike=167 Dip=33 Slip=-115 NP2: 16 60 -74
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.