USGS Body-Wave Moment Tensor Solution
REVILLA GIGEDO ISLANDS REGION
11/11/01 12:32:00.28 Epicenter: 19.859 -109.184 MW 6.1 USGS MOMENT TENSOR SOLUTION Depth 5 No. of sta: 45 Moment Tensor; Scale 10**18 Nm Mrr=-0.23 Mtt=-1.41 Mpp= 1.64 Mrt= 0.63 Mrp= 0.09 Mtp=-1.11 Principal axes: T Val= 2.01 Plg= 3 Azm= 71 N -0.02 70 333 P -1.99 20 163 Best Double Couple:Mo=2.0*10**18 NP1:Strike=205 Dip=74 Slip= -12 NP2: 299 78 -164
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.