USGS Body-Wave Moment Tensor Solution
GULF OF CALIFORNIA
13/01/13 16:28:26.18 Epicenter: 25.916 -110.157 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 6 No. of sta: 34 Moment Tensor; Scale 10**17 Nm Mrr= 0.04 Mtt=-2.22 Mpp= 2.17 Mrt=-0.14 Mrp=-1.24 Mtp=-0.32 Principal axes: T Val= 2.76 Plg=24 Azm= 87 N -0.49 65 250 P -2.27 7 354 Best Double Couple:Mo=2.5*10**17 NP1:Strike=223 Dip=78 Slip= 23 NP2: 128 68 167
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.