USGS Body-Wave Moment Tensor Solution
12/11/14 05:21:42.71 Epicenter: 10.002 122.474 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 28 No. of sta: 56 Moment Tensor; Scale 10**17 Nm Mrr= 1.78 Mtt= 0.71 Mpp=-2.49 Mrt=-0.52 Mrp=-1.90 Mtp=-0.18 Principal axes: T Val= 2.60 Plg=66 Azm=124 N 0.64 10 9 P -3.24 21 275 Best Double Couple:Mo=3.0*10**17 NP1:Strike=347 Dip=26 Slip= 66 NP2: 194 67 101
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.