USGS/SLU Regional Moment Solution
SOUTH ISLAND OF NEW ZEALAND
13/01/19 08:15:08.43 Epicenter: -43.526 172.495 MW 4.2 USGS/SLU REGIONAL MOMENT TENSOR Depth 6 No. of sta: 23 Moment Tensor; Scale 10**15 Nm Mrr=-0.38 Mtt= 0.89 Mpp=-0.50 Mrt=-1.01 Mrp=-0.44 Mtp=-2.11 Principal axes: T Val= 2.52 Plg=12 Azm=213 N -0.05 62 101 P -2.47 25 309 Best Double Couple:Mo=2.5*10**15 NP1:Strike= 83 Dip=81 Slip=-153 NP2: 349 64 -10
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.