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

Moment Tensor Solution
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.

Moment Tensor Solution

Details on the W-phase inversion algorithm.