USGS Body-Wave Moment Tensor Solution
13/04/06 04:42:36.44 Epicenter: -3.524 138.464 MW 7.0 USGS MOMENT TENSOR SOLUTION Depth 70 No. of sta: 52 Moment Tensor; Scale 10**19 Nm Mrr=-2.69 Mtt=-0.81 Mpp= 3.49 Mrt= 1.18 Mrp= 0.07 Mtp= 0.67 Principal axes: T Val= 3.61 Plg= 2 Azm=279 N -0.34 26 10 P -3.26 64 184 Best Double Couple:Mo=3.5*10**19 NP1:Strike=212 Dip=53 Slip= -56 NP2: 345 48 -126
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.