USGS Body-Wave Moment Tensor Solution
SOUTH ISLAND OF NEW ZEALAND
13/08/16 02:31:08.10 Epicenter: -41.722 173.987 MW 6.5 USGS MOMENT TENSOR SOLUTION Depth 14 No. of sta: 46 Moment Tensor; Scale 10**18 Nm Mrr= 1.26 Mtt= 4.28 Mpp=-5.54 Mrt=-1.78 Mrp= 1.33 Mtp=-2.89 Principal axes: T Val= 5.99 Plg=24 Azm=197 N 0.43 65 0 P -6.42 6 104 Best Double Couple:Mo=6.2*10**18 NP1:Strike=238 Dip=69 Slip= 167 NP2: 333 78 22
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.