USGS Body-Wave Moment Tensor Solution
KEPULAUAN BATU, INDONESIA
12/10/03 13:32:34.92 Epicenter: -0.447 97.667 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 6 No. of sta: 45 Moment Tensor; Scale 10**17 Nm Mrr= 3.19 Mtt=-1.47 Mpp=-1.72 Mrt= 1.83 Mrp=-3.10 Mtp= 0.72 Principal axes: T Val= 4.98 Plg=64 Azm= 62 N -0.89 3 326 P -4.08 26 235 Best Double Couple:Mo=4.6*10**17 NP1:Strike=319 Dip=19 Slip= 82 NP2: 147 71 93
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.