USGS Body-Wave Moment Tensor Solution
12/12/05 17:08:12.23 Epicenter: 33.490 59.554 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 9 No. of sta: 66 Moment Tensor; Scale 10**17 Nm Mrr= 1.53 Mtt=-1.35 Mpp=-0.18 Mrt= 0.43 Mrp= 1.11 Mtp= 2.65 Principal axes: T Val= 2.90 Plg=40 Azm=306 N 0.60 50 135 P -3.51 4 40 Best Double Couple:Mo=3.3*10**17 NP1:Strike=346 Dip=66 Slip= 146 NP2: 91 60 28
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.