USGS Body-Wave Moment Tensor Solution
13/02/15 03:02:23.28 Epicenter: -19.746 -174.471 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 76 No. of sta: 67 Moment Tensor; Scale 10**17 Nm Mrr=-4.64 Mtt= 0.75 Mpp= 3.89 Mrt=-0.24 Mrp= 5.21 Mtp=-0.82 Principal axes: T Val= 6.48 Plg=25 Azm=261 N 0.63 4 353 P -7.11 65 92 Best Double Couple:Mo=6.8*10**17 NP1:Strike=174 Dip=70 Slip= -85 NP2: 341 20 -103
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.