USGS Body-Wave Moment Tensor Solution
13/05/01 06:57:12.75 Epicenter: 33.094 75.838 MW 5.4 USGS MOMENT TENSOR SOLUTION Depth 16 No. of sta: 35 Moment Tensor; Scale 10**17 Nm Mrr= 1.11 Mtt=-0.69 Mpp=-0.42 Mrt= 1.04 Mrp=-0.77 Mtp= 0.18 Principal axes: T Val= 1.77 Plg=63 Azm= 39 N -0.34 3 304 P -1.43 27 213 Best Double Couple:Mo=1.6*10**17 NP1:Strike=296 Dip=18 Slip= 82 NP2: 125 72 93
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.