USGS Body-Wave Moment Tensor Solution


12/12/12 01:44:24.75

Epicenter: -19.607 -176.199
MW 5.4

Depth   9         No. of sta: 32
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.25       Mtt=-1.81
  Mpp= 1.55       Mrt= 0.03
  Mrp= 0.16       Mtp=-0.50
 Principal axes:
  T  Val=  1.64  Plg= 6  Azm=262
  N        0.24      84       69
  P       -1.88       1      172

Best Double Couple:Mo=1.8*10**17
 NP1:Strike= 37 Dip=87 Slip=   5
 NP2:       307     85       177

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