USGS Centroid Moment Solution
13/09/07 00:13:29.86 Epicenter: 14.644 -92.104 MW 6.4 USGS CENTROID MOMENT TENSOR 13/09/07 00:13:54.40 Centroid: 14.573 -91.533 Depth 89 No. of sta:112 Moment Tensor; Scale 10**18 Nm Mrr=-0.00 Mtt=-1.31 Mpp= 1.31 Mrt= 3.16 Mrp=-2.54 Mtp=-0.29 Principal axes: T Val= 4.27 Plg=42 Azm= 56 N 0.00 18 309 P -4.27 42 201 Best Double Couple:Mo=4.3*10**18 NP1:Strike=309 Dip=90 Slip=-108 NP2: 219 18 -0
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.