USGS/SLU Regional Moment Solution
13/01/30 04:27:25.89 Epicenter: 38.766 23.366 MW 3.9 USGS/SLU REGIONAL MOMENT TENSOR Depth 8 No. of sta: 12 Moment Tensor; Scale 10**14 Nm Mrr=-8.49 Mtt= 8.93 Mpp=-0.44 Mrt= 0.72 Mrp=-3.40 Mtp= 0.73 Principal axes: T Val= 9.00 Plg= 2 Azm=356 N 0.78 20 87 P -9.78 70 262 Best Double Couple:Mo=9.4*10**14 NP1:Strike= 67 Dip=47 Slip=-118 NP2: 285 50 -63
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.