USGS Body-Wave Moment Tensor Solution
13/05/06 07:33:06.17 Epicenter: -21.115 -176.158 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 4 No. of sta: 34 Moment Tensor; Scale 10**17 Nm Mrr= 2.21 Mtt=-1.65 Mpp=-0.56 Mrt=-1.20 Mrp= 0.02 Mtp= 0.43 Principal axes: T Val= 2.55 Plg=74 Azm=173 N -0.44 6 284 P -2.11 15 16 Best Double Couple:Mo=2.4*10**17 NP1:Strike=281 Dip=60 Slip= 83 NP2: 114 30 102
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.