USGS Body-Wave Moment Tensor Solution
13/05/12 07:30:03.54 Epicenter: 13.563 -91.285 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 11 No. of sta: 53 Moment Tensor; Scale 10**17 Nm Mrr= 0.67 Mtt=-0.34 Mpp=-0.33 Mrt= 3.01 Mrp=-1.06 Mtp= 0.16 Principal axes: T Val= 3.36 Plg=50 Azm= 18 N -0.23 2 110 P -3.13 40 202 Best Double Couple:Mo=3.3*10**17 NP1:Strike=313 Dip= 5 Slip= 113 NP2: 110 85 88
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.