USGS Body-Wave Moment Tensor Solution
SOUTHWEST INDIAN RIDGE
13/08/17 16:32:31.26 Epicenter: -34.894 54.103 MW 6.1 USGS MOMENT TENSOR SOLUTION Depth 7 No. of sta: 43 Moment Tensor; Scale 10**18 Nm Mrr=-0.14 Mtt= 0.40 Mpp=-0.26 Mrt=-0.37 Mrp= 0.35 Mtp= 1.88 Principal axes: T Val= 1.98 Plg= 2 Azm=140 N -0.00 74 236 P -1.98 15 50 Best Double Couple:Mo=2.0*10**18 NP1:Strike= 94 Dip=80 Slip= -12 NP2: 186 78 -170
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.