USGS Body-Wave Moment Tensor Solution
13/04/09 11:52:50.10 Epicenter: 28.509 51.620 MW 6.2 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 86 Moment Tensor; Scale 10**18 Nm Mrr= 1.38 Mtt=-0.04 Mpp=-1.34 Mrt=-0.65 Mrp= 0.06 Mtp= 2.21 Principal axes: T Val= 2.01 Plg=39 Azm=147 N 1.03 50 316 P -3.04 6 53 Best Double Couple:Mo=2.7*10**18 NP1:Strike=182 Dip=59 Slip= 154 NP2: 286 68 34
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.