USGS Body-Wave Moment Tensor Solution
PHILIPPINE ISLANDS REGION
12/08/31 12:47:34.48 Epicenter: 10.831 126.651 MW 7.5 USGS MOMENT TENSOR SOLUTION Depth 45 No. of sta: 63 Moment Tensor; Scale 10**20 Nm Mrr= 2.33 Mtt= 0.42 Mpp=-2.75 Mrt=-0.23 Mrp=-0.42 Mtp=-0.21 Principal axes: T Val= 2.38 Plg=82 Azm=144 N 0.42 6 5 P -2.80 5 274 Best Double Couple:Mo=2.6*10**20 NP1:Strike=358 Dip=40 Slip= 81 NP2: 189 50 98
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.