USGS/SLU Regional Moment Solution
13/02/13 22:20:16.22 Epicenter: 38.048 -118.082 MW 3.7 USGS/SLU REGIONAL MOMENT TENSOR Depth 12 No. of sta: 38 Moment Tensor; Scale 10**14 Nm Mrr=-3.16 Mtt=-0.11 Mpp= 3.28 Mrt= 1.87 Mrp=-0.98 Mtp= 2.51 Principal axes: T Val= 4.61 Plg= 0 Azm=298 N -0.03 34 28 P -4.59 56 208 Best Double Couple:Mo=4.6*10**14 NP1:Strike=359 Dip=54 Slip=-134 NP2: 237 54 -46
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.