USGS Body-Wave Moment Tensor Solution
12/12/09 21:45:34.19 Epicenter: 6.710 126.183 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 40 No. of sta: 24 Moment Tensor; Scale 10**17 Nm Mrr=-0.52 Mtt=-0.33 Mpp= 0.85 Mrt= 0.17 Mrp= 2.10 Mtp=-1.52 Principal axes: T Val= 2.81 Plg=29 Azm=246 N -0.24 36 359 P -2.57 41 127 Best Double Couple:Mo=2.7*10**17 NP1:Strike=184 Dip=83 Slip= -54 NP2: 283 37 -169
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.