USGS/SLU Regional Moment Solution
12/12/13 21:39:26.68 Epicenter: 41.111 19.793 MW 4.1 USGS/SLU REGIONAL MOMENT TENSOR Depth 26 No. of sta: 17 Moment Tensor; Scale 10**15 Nm Mrr= 0.41 Mtt=-0.58 Mpp= 0.17 Mrt= 0.64 Mrp=-1.25 Mtp= 0.46 Principal axes: T Val= 1.56 Plg=49 Azm= 83 N 0.01 21 327 P -1.57 34 222 Best Double Couple:Mo=1.6*10**15 NP1:Strike=150 Dip=82 Slip= 111 NP2: 260 22 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.