USGS Body-Wave Moment Tensor Solution
13/05/12 00:07:01.71 Epicenter: 26.772 57.766 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 16 No. of sta: 18 Moment Tensor; Scale 10**17 Nm Mrr=-0.02 Mtt=-0.95 Mpp= 0.97 Mrt= 0.47 Mrp= 0.02 Mtp= 1.88 Principal axes: T Val= 2.16 Plg= 7 Azm=302 N 0.02 77 66 P -2.18 10 211 Best Double Couple:Mo=2.2*10**17 NP1:Strike=256 Dip=88 Slip= -12 NP2: 347 78 -178
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.