USGS WPhase Moment Solution
NORTHWESTERN IRAN
12/ 8/11 12:34:35.00 Epicenter: 38.323 46.758 MW 6.2 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 8/11 12:34:35.00 Centroid: 38.623 47.141 Depth 11 No. of sta: 19 Moment Tensor; Scale 10**18 Nm Mrr= 1.74 Mtt=-1.06 Mpp=-0.68 Mrt=-1.10 Mrp= 0.41 Mtp=-1.71 Principal axes: T Val= 2.46 Plg=57 Azm=218 N = 0.20 31 55 P = -2.66 7 320 Best Double Couple:Mo=2.6*10**18 NP1:Strike= 19 Dip=47 Slip= 43 NP2: 256 60 127
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.
