USGS Body-Wave Moment Tensor Solution
KEP. MENTAWAI REGION, INDONESIA
12/09/14 04:51:47.41 Epicenter: -3.353 100.603 MW 6.2 USGS MOMENT TENSOR SOLUTION Depth 22 No. of sta: 71 Moment Tensor; Scale 10**18 Nm Mrr= 1.59 Mtt=-1.07 Mpp=-0.51 Mrt= 1.52 Mrp=-0.96 Mtp= 0.24 Principal axes: T Val= 2.49 Plg=63 Azm= 35 N -0.45 3 299 P -2.04 26 207 Best Double Couple:Mo=2.3*10**18 NP1:Strike=289 Dip=19 Slip= 80 NP2: 120 71 94
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.