USGS Body-Wave Moment Tensor Solution

NORTHERN MID-ATLANTIC RIDGE

12/10/05 00:15:41.96

Epicenter:  17.505  -46.460
MW 5.4

USGS MOMENT TENSOR SOLUTION
Depth   4         No. of sta: 20
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.70       Mtt= 0.26
  Mpp= 0.45       Mrt=-0.19
  Mrp= 1.50       Mtp=-0.40
 Principal axes:
  T  Val=  1.62  Plg=32  Azm=249
  N        0.12      12      346
  P       -1.73      55       94

Best Double Couple:Mo=1.7*10**17
 NP1:Strike=169 Dip=78 Slip= -78
 NP2:       302     17      -135

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