USGS Centroid Moment Solution
NORTHWESTERN IRAN
12/08/11 12:23:17.83 Epicenter: 38.325 46.860 MW 6.4 USGS CENTROID MOMENT TENSOR 12/08/11 12:23:33.29 Centroid: 38.983 46.546 Depth 10 No. of sta: 103 Moment Tensor; Scale 10**18 Nm Mrr= 0.49 Mtt= 0.36 Mpp=-0.85 Mrt=-0.83 Mrp=-3.18 Mtp=-4.81 Principal axes: T Val= 5.18 Plg=21 Azm= 48 N 1.21 57 175 P -6.38 24 308 Best Double Couple:Mo=5.8*10**18 NP1:Strike= 89 Dip=57 Slip=-178 NP2: 357 88 -33
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.
