USGS Body-Wave Moment Tensor Solution
SOUTH OF KERMADEC ISLANDS
12/06/21 22:34:38.76 Epicenter: -17.889 -178.170 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 536 No. of sta: 30 Moment Tensor; Scale 10**17 Nm Mrr=-1.27 Mtt= 0.76 Mpp= 0.50 Mrt=-0.33 Mrp=-2.16 Mtp= 0.79 Principal axes: T Val= 2.39 Plg=29 Azm=122 N 0.33 17 22 P -2.73 56 265 Best Double Couple:Mo=2.6*10**17 NP1:Strike=250 Dip=23 Slip= -39 NP2: 17 76 -108
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.