USGS Body-Wave Moment Tensor Solution
13/02/15 19:55:31.72 Epicenter: -17.699 -178.838 MW 5.4 USGS MOMENT TENSOR SOLUTION Depth 550 No. of sta: 12 Moment Tensor; Scale 10**17 Nm Mrr=-0.07 Mtt= 0.95 Mpp=-0.88 Mrt= 0.85 Mrp=-0.16 Mtp= 0.65 Principal axes: T Val= 1.54 Plg=26 Azm=347 N -0.27 54 119 P -1.26 23 245 Best Double Couple:Mo=1.4*10**17 NP1:Strike= 25 Dip=54 Slip= 177 NP2: 116 88 36
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.