USGS Body-Wave Moment Tensor Solution
12/10/14 04:58:07.60 Epicenter: -7.192 156.073 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 37 No. of sta: 30 Moment Tensor; Scale 10**17 Nm Mrr= 6.34 Mtt=-4.72 Mpp=-1.62 Mrt=-0.77 Mrp= 0.45 Mtp= 3.13 Principal axes: T Val= 6.40 Plg=86 Azm=209 N 0.32 0 302 P -6.72 4 32 Best Double Couple:Mo=6.6*10**17 NP1:Strike=302 Dip=49 Slip= 90 NP2: 122 41 90
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.