USGS Body-Wave Moment Tensor Solution
OFFSHORE MAULE, CHILE
13/03/29 07:30:58.33 Epicenter: -35.372 -72.747 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 9 No. of sta: 16 Moment Tensor; Scale 10**17 Nm Mrr= 1.58 Mtt=-0.23 Mpp=-1.35 Mrt= 0.00 Mrp=-1.23 Mtp= 0.31 Principal axes: T Val= 2.04 Plg=70 Azm= 98 N -0.18 6 351 P -1.86 19 259 Best Double Couple:Mo=2.0*10**17 NP1:Strike=339 Dip=26 Slip= 76 NP2: 174 65 97
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.