USGS WPhase Moment Solution
NORTHWESTERN IRAN
12/ 8/11 12:23:17.00 Epicenter: 38.378 46.873 MW 6.4 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 8/11 12:23:17.00 Centroid: 38.378 47.128 Depth 11 No. of sta: 15 Moment Tensor; Scale 10**18 Nm Mrr= 0.19 Mtt= 0.26 Mpp=-0.45 Mrt= 2.15 Mrp=-1.16 Mtp=-4.57 Principal axes: T Val= 5.54 Plg=23 Azm= 41 N = -0.78 64 242 P = -4.76 8 134 Best Double Couple:Mo=5.2*10**18 NP1:Strike=180 Dip=67 Slip= 12 NP2: 86 79 157
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.
