USGS/SLU Regional Moment Solution
OFF COAST OF JALISCO, MEXICO
12/10/01 17:32:31.00 Epicenter: 18.700 -107.151 MW 5.2 USGS/SLU REGIONAL MOMENT TENSOR Depth 9 No. of sta: 8 Moment Tensor; Scale 10**16 Nm Mrr=-1.46 Mtt=-3.27 Mpp= 4.72 Mrt= 1.58 Mrp= 1.03 Mtp=-4.93 Principal axes: T Val= 7.08 Plg= 2 Azm=245 N -0.75 69 339 P -6.33 21 154 Best Double Couple:Mo=6.7*10**16 NP1:Strike=198 Dip=77 Slip= -16 NP2: 291 74 -166
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.