USGS Body-Wave Moment Tensor Solution
COOK STRAIT, NEW ZEALAND
13/07/21 05:09:31.26 Epicenter: -41.713 174.443 MW 6.4 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 43 Moment Tensor; Scale 10**18 Nm Mrr= 2.01 Mtt= 3.97 Mpp=-5.98 Mrt=-2.04 Mrp=-0.32 Mtp=-0.79 Principal axes: T Val= 5.28 Plg=32 Azm=183 N 0.79 58 11 P -6.07 4 275 Best Double Couple:Mo=5.7*10**18 NP1:Strike=324 Dip=65 Slip= 21 NP2: 225 71 154
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.