USGS Body-Wave Moment Tensor Solution
13/03/03 05:41:20.10 Epicenter: 25.968 99.815 MW 5.2 USGS MOMENT TENSOR SOLUTION Depth 8 No. of sta: 19 Moment Tensor; Scale 10**16 Nm Mrr=-7.42 Mtt=-0.15 Mpp= 7.57 Mrt= 1.56 Mrp=-2.40 Mtp=-2.08 Principal axes: T Val= 8.56 Plg=10 Azm= 75 N -0.56 7 344 P -8.00 78 219 Best Double Couple:Mo=8.3*10**16 NP1:Strike=173 Dip=36 Slip= -78 NP2: 339 55 -98
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.