USGS Body-Wave Moment Tensor Solution
12/04/14 22:05:26.99 Epicenter: -18.990 168.739 MW 6.2 USGS MOMENT TENSOR SOLUTION Depth 13 No. of sta: 51 Moment Tensor; Scale 10**18 Nm Mrr=-1.35 Mtt= 2.20 Mpp=-0.85 Mrt= 0.53 Mrp= 1.09 Mtp= 0.17 Principal axes: T Val= 2.31 Plg=10 Azm=353 N -0.07 36 256 P -2.24 52 97 Best Double Couple:Mo=2.3*10**18 NP1:Strike=119 Dip=47 Slip= -36 NP2: 235 64 -131
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.