USGS WPhase Moment Solution

SOUTH OF PANAMA

12/06/04  3:15:25

Epicenter:   5.508  -82.468
MW 6.3

USGS/WPHASE CENTROID MOMENT TENSOR
12/06/04 03:15:25.00
Centroid:    5.308  -82.468
Depth  11         No. of sta: 14
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.01       Mtt= 2.77
  Mpp=-2.76       Mrt= 0.81
  Mrp=-0.11       Mtp= 1.49
 Principal axes:
  T  Val=  3.32  Plg=12  Azm=346
  N     = -0.15      75      141
  P     = -3.17       5      255

Best Double Couple:Mo=3.2*10**18
 NP1:Strike= 30 Dip=77 Slip= 175
 NP2:       121     85        13

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.