USGS Body-Wave Moment Tensor Solution
13/08/29 13:52:26.67 Epicenter: -19.341 -179.114 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 660 No. of sta: 38 Moment Tensor; Scale 10**17 Nm Mrr= 5.44 Mtt=-5.45 Mpp= 0.01 Mrt= 1.16 Mrp=-2.14 Mtp=-1.25 Principal axes: T Val= 6.38 Plg=69 Azm= 69 N -0.61 21 261 P -5.77 4 169 Best Double Couple:Mo=6.1*10**17 NP1:Strike=238 Dip=45 Slip= 60 NP2: 98 52 117
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.