USGS WPhase Moment Solution

NEW BRITAIN REGION, P.N.G.

13/03/10 22:51:56

Epicenter:  -6.748  148.241
MW 6.5

USGS/WPHASE CENTROID MOMENT TENSOR
13/03/10 22:51:56.00
Centroid:   -6.548  148.342
Depth  19         No. of sta: 40
Moment Tensor;   Scale 10**18 Nm
  Mrr= 0.32       Mtt=-1.26
  Mpp= 0.94       Mrt=-1.57
  Mrp=-2.23       Mtp= 6.54
 Principal axes:
  T  Val=  7.50  Plg=20  Azm=129
  N     = -0.70      69      316
  P     = -6.80       2      220

Best Double Couple:Mo=7.2*10**18
 NP1:Strike=267 Dip=74 Slip=  13
 NP2:       173     77       163

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

Details on the W-phase inversion algorithm.