USGS Body-Wave Moment Tensor Solution
KERMADEC ISLANDS REGION
13/08/28 02:54:41.86 Epicenter: -27.792 179.625 MW 6.2 USGS MOMENT TENSOR SOLUTION Depth 485 No. of sta: 41 Moment Tensor; Scale 10**18 Nm Mrr= 0.73 Mtt=-0.76 Mpp= 0.03 Mrt= 1.19 Mrp=-0.40 Mtp=-1.94 Principal axes: T Val= 2.36 Plg=35 Azm= 45 N 0.14 52 251 P -2.50 13 144 Best Double Couple:Mo=2.4*10**18 NP1:Strike=190 Dip=56 Slip= 17 NP2: 90 76 145
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.