USGS Body-Wave Moment Tensor Solution

NORTHERN MID-ATLANTIC RIDGE

12/10/05 00:19:57.14

Epicenter:  17.496  -46.461
MW 5.7

USGS MOMENT TENSOR SOLUTION
Depth   3         No. of sta: 17
Moment Tensor;   Scale 10**17 Nm
  Mrr=-1.16       Mtt= 1.57
  Mpp=-0.41       Mrt=-1.41
  Mrp= 3.52       Mtp=-0.39
 Principal axes:
  T  Val=  3.55  Plg=37  Azm=227
  N        0.88      16      329
  P       -4.43      49       78

Best Double Couple:Mo=4.1*10**17
 NP1:Strike=151 Dip=84 Slip= -74
 NP2:       262     17      -158

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