USGS Body-Wave Moment Tensor Solution
13/06/02 05:43:03.94 Epicenter: 23.799 121.102 MW 6.1 USGS MOMENT TENSOR SOLUTION Depth 18 No. of sta: 82 Moment Tensor; Scale 10**18 Nm Mrr= 1.58 Mtt= 0.06 Mpp=-1.64 Mrt=-0.02 Mrp=-0.84 Mtp=-0.95 Principal axes: T Val= 1.82 Plg=72 Azm= 63 N 0.41 13 200 P -2.22 12 293 Best Double Couple:Mo=2.0*10**18 NP1:Strike= 39 Dip=35 Slip= 113 NP2: 192 58 75
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.