USGS Body-Wave Moment Tensor Solution
TONGA
13/02/07 07:19:51.43 Epicenter: -15.599 -173.144 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 18 No. of sta:107 Moment Tensor; Scale 10**17 Nm Mrr= 3.28 Mtt=-0.58 Mpp=-2.70 Mrt= 0.74 Mrp= 3.15 Mtp=-0.09 Principal axes: T Val= 4.71 Plg=66 Azm=287 N -0.62 4 188 P -4.09 24 97 Best Double Couple:Mo=4.4*10**17 NP1:Strike= 10 Dip=69 Slip= 94 NP2: 179 22 79
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.
