USGS Body-Wave Moment Tensor Solution
12/12/28 17:32:17.24 Epicenter: -0.245 122.940 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 98 No. of sta: 21 Moment Tensor; Scale 10**17 Nm Mrr= 1.17 Mtt=-0.79 Mpp=-0.38 Mrt= 1.65 Mrp=-0.74 Mtp= 0.53 Principal axes: T Val= 2.17 Plg=61 Azm= 19 N -0.04 4 117 P -2.13 29 210 Best Double Couple:Mo=2.1*10**17 NP1:Strike=312 Dip=17 Slip= 106 NP2: 116 74 85
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.