USGS Body-Wave Moment Tensor Solution
12/09/12 03:27:45.51 Epicenter: 34.879 24.136 MW 5.3 USGS MOMENT TENSOR SOLUTION Depth 21 No. of sta: 53 Moment Tensor; Scale 10**17 Nm Mrr= 0.26 Mtt=-0.17 Mpp=-0.09 Mrt= 0.89 Mrp=-0.67 Mtp=-0.03 Principal axes: T Val= 1.20 Plg=50 Azm= 39 N -0.14 2 306 P -1.06 40 215 Best Double Couple:Mo=1.1*10**17 NP1:Strike=281 Dip= 5 Slip= 65 NP2: 127 85 92
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.