USGS WPhase Moment Solution
NORTHERN SUMATRA, INDONESIA
13/ 1/10 13:47:3.00 Epicenter: 4.753 95.132 MW 5.7 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 1/10 13:47: 3.00 Centroid: 4.353 95.333 Depth 45 No. of sta: 43 Moment Tensor; Scale 10**17 Nm Mrr= 2.15 Mtt=-1.33 Mpp=-0.82 Mrt= 3.11 Mrp=-2.67 Mtp= 0.90 Principal axes: T Val= 4.67 Plg=58 Azm= 42 N = -0.15 1 309 P = -4.52 31 219 Best Double Couple:Mo=4.6*10**17 NP1:Strike=304 Dip=13 Slip= 84 NP2: 130 76 91
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.
