USGS Body-Wave Moment Tensor Solution
12/11/27 02:59:05.99 Epicenter: -2.946 129.209 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 19 No. of sta: 25 Moment Tensor; Scale 10**17 Nm Mrr= 0.72 Mtt=-1.97 Mpp= 1.25 Mrt=-0.60 Mrp= 1.21 Mtp= 0.92 Principal axes: T Val= 2.25 Plg=37 Azm=276 N 0.23 49 129 P -2.48 17 19 Best Double Couple:Mo=2.4*10**17 NP1:Strike=324 Dip=78 Slip= 140 NP2: 64 51 16
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.