USGS Body-Wave Moment Tensor Solution
TONGA
13/01/27 09:59:27.40 Epicenter: -16.105 -173.240 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 19 No. of sta: 53 Moment Tensor; Scale 10**17 Nm Mrr=-2.99 Mtt= 2.70 Mpp= 0.30 Mrt= 0.23 Mrp= 0.58 Mtp= 3.88 Principal axes: T Val= 5.59 Plg= 4 Azm=323 N -2.39 28 232 P -3.20 62 60 Best Double Couple:Mo=4.9*10**17 NP1:Strike=210 Dip=54 Slip=-125 NP2: 80 48 -51
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.
