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

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.