USGS Body-Wave Moment Tensor Solution
11/02/11 20:05:31.66
OFFSHORE BIO-BIO, CHILE
Epicenter: -36.397 -72.950
MW 6.8
USGS MOMENT TENSOR SOLUTION
Depth 26 No. of sta: 49
Moment Tensor; Scale 10**19 Nm
Mrr= 0.55 Mtt= 0.06
Mpp=-0.61 Mrt= 0.33
Mrp=-1.55 Mtp=-0.10
Principal axes:
T Val= 1.69 Plg=54 Azm= 70
N 0.00 7 171
P -1.69 35 266
Best Double Couple:Mo=1.7*10**19
NP1:Strike= 28 Dip=12 Slip= 128
NP2: 169 80 82
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 form 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.
