USGS Body-Wave Moment Tensor Solution
13/01/08 14:16:08.50 Epicenter: 39.658 25.543 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 9 No. of sta: 37 Moment Tensor; Scale 10**17 Nm Mrr=-1.12 Mtt= 4.44 Mpp=-3.32 Mrt= 0.18 Mrp=-0.69 Mtp=-2.14 Principal axes: T Val= 5.01 Plg= 3 Azm= 15 N -1.00 77 119 P -4.01 12 284 Best Double Couple:Mo=4.6*10**17 NP1:Strike=329 Dip=84 Slip= -11 NP2: 60 79 -174
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.