USGS Body-Wave Moment Tensor Solution
13/03/27 02:03:19.90 Epicenter: 23.850 121.146 MW 5.9 USGS MOMENT TENSOR SOLUTION Depth 20 No. of sta: 59 Moment Tensor; Scale 10**17 Nm Mrr= 5.48 Mtt=-0.61 Mpp=-4.87 Mrt=-1.41 Mrp=-5.19 Mtp=-1.84 Principal axes: T Val= 7.68 Plg=68 Azm=101 N 0.05 3 198 P -7.73 22 289 Best Double Couple:Mo=7.7*10**17 NP1:Strike= 24 Dip=23 Slip= 97 NP2: 197 67 87
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.