USGS/SLU Regional Moment Solution
13/01/12 12:34:16.51 Epicenter: 23.954 122.408 MW 4.3 USGS/SLU REGIONAL MOMENT TENSOR Depth 29 No. of sta: 17 Moment Tensor; Scale 10**15 Nm Mrr= 1.79 Mtt=-2.72 Mpp= 0.93 Mrt= 1.69 Mrp= 1.25 Mtp= 0.28 Principal axes: T Val= 3.10 Plg=55 Azm=297 N 0.19 28 77 P -3.29 19 178 Best Double Couple:Mo=3.2*10**15 NP1:Strike=305 Dip=36 Slip= 143 NP2: 66 69 60
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.