USGS Body-Wave Moment Tensor Solution
GULF OF CALIFORNIA
12/10/08 06:26:22.28 Epicenter: 25.125 -109.698 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 22 No. of sta: 38 Moment Tensor; Scale 10**18 Nm Mrr=-0.05 Mtt=-0.98 Mpp= 1.03 Mrt=-0.06 Mrp=-0.28 Mtp=-0.27 Principal axes: T Val= 1.12 Plg=13 Azm= 83 N -0.10 76 238 P -1.02 6 352 Best Double Couple:Mo=1.1*10**18 NP1:Strike=218 Dip=85 Slip= 13 NP2: 127 77 175
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.