USGS Body-Wave Moment Tensor Solution

NORTH OF ASCENSION ISLAND

13/01/12 21:50:17.93

Epicenter:   0.061  -17.036
MW 5.1

USGS MOMENT TENSOR SOLUTION
Depth   4         No. of sta: 12
Moment Tensor;   Scale 10**16 Nm
  Mrr=-3.92       Mtt= 2.01
  Mpp= 1.91       Mrt=-0.23
  Mrp= 2.30       Mtp=-3.05
 Principal axes:
  T  Val=  5.36  Plg=11  Azm=227
  N       -0.54      20      321
  P       -4.82      67      110

Best Double Couple:Mo=5.1*10**16
 NP1:Strike=154 Dip=59 Slip= -66
 NP2:       293     38      -124

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