USGS Body-Wave Moment Tensor Solution
13/04/11 15:28:30.74 Epicenter: -17.349 175.050 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 11 No. of sta: 23 Moment Tensor; Scale 10**17 Nm Mrr= 0.05 Mtt= 0.02 Mpp=-0.06 Mrt= 0.46 Mrp= 0.24 Mtp= 2.33 Principal axes: T Val= 2.41 Plg=12 Azm=316 N -0.05 78 118 P -2.36 4 225 Best Double Couple:Mo=2.4*10**17 NP1:Strike=360 Dip=79 Slip= 174 NP2: 91 84 11
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.