USGS Body-Wave Moment Tensor Solution


13/04/02 14:34:55.36

Epicenter: -40.443   45.303
MW 5.8

Depth   3         No. of sta: 25
Moment Tensor;   Scale 10**17 Nm
  Mrr=-6.22       Mtt= 5.49
  Mpp= 0.73       Mrt= 2.99
  Mrp=-0.89       Mtp= 3.19
 Principal axes:
  T  Val=  7.48  Plg=10  Azm=336
  N       -0.20      17       69
  P       -7.28      70      218

Best Double Couple:Mo=7.4*10**17
 NP1:Strike= 46 Dip=38 Slip=-119
 NP2:       261     57       -69

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