USGS/SLU Regional Moment Solution
12/11/28 01:49:46.63 Epicenter: 42.415 20.074 MW 4.0 USGS/SLU REGIONAL MOMENT TENSOR Depth 9 No. of sta: 24 Moment Tensor; Scale 10**15 Nm Mrr=-0.99 Mtt= 0.99 Mpp= 0.00 Mrt= 1.10 Mrp=-0.13 Mtp=-0.08 Principal axes: T Val= 1.49 Plg=24 Azm= 5 N -0.00 1 96 P -1.49 66 188 Best Double Couple:Mo=1.5*10**15 NP1:Strike=276 Dip=69 Slip= -89 NP2: 93 21 -93
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.