USGS Body-Wave Moment Tensor Solution
13/02/28 03:09:44.04 Epicenter: -17.769 167.356 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 26 No. of sta: 42 Moment Tensor; Scale 10**17 Nm Mrr= 3.13 Mtt=-1.05 Mpp=-2.08 Mrt=-0.18 Mrp=-2.12 Mtp= 4.06 Principal axes: T Val= 4.52 Plg=52 Azm=128 N 1.39 36 328 P -5.90 10 230 Best Double Couple:Mo=5.3*10**17 NP1:Strike=285 Dip=48 Slip= 36 NP2: 169 64 131
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.