USGS/SLU Regional Moment Solution
13/02/13 17:05:15.18 Epicenter: 38.032 -118.052 MW 3.7 USGS/SLU REGIONAL MOMENT TENSOR Depth 11 No. of sta: 57 Moment Tensor; Scale 10**14 Nm Mrr=-1.00 Mtt=-1.73 Mpp= 2.74 Mrt= 1.82 Mrp=-1.05 Mtp= 3.14 Principal axes: T Val= 4.36 Plg= 1 Azm=117 N 0.23 60 25 P -4.59 30 208 Best Double Couple:Mo=4.5*10**14 NP1:Strike=346 Dip=70 Slip=-157 NP2: 248 68 -22
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.