USGS Body-Wave Moment Tensor Solution
SOUTH ISLAND OF NEW ZEALAND
11/12/23 00:58:36.86 Epicenter: -43.525 172.917 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 10 No. of sta: 31 Moment Tensor; Scale 10**17 Nm Mrr= 0.56 Mtt= 1.94 Mpp=-2.49 Mrt= 0.07 Mrp=-2.11 Mtp=-2.43 Principal axes: T Val= 3.37 Plg=22 Azm= 30 N 0.95 59 160 P -4.33 22 291 Best Double Couple:Mo=3.9*10**17 NP1:Strike= 71 Dip=59 Slip=-180 NP2: 341 90 -31
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.