USGS WPhase Moment Solution
OFF COAST OF CENTRAL AMERICA
13/03/10 10:18:17 Epicenter: 12.801 -90.679 MW 5.5 USGS/WPHASE CENTROID MOMENT TENSOR 13/03/10 10:18:17.00 Centroid: 12.801 -90.781 Depth 11 No. of sta:180 Moment Tensor; Scale 10**17 Nm Mrr=-2.65 Mtt= 1.83 Mpp= 0.82 Mrt=-0.34 Mrp=-0.14 Mtp=-0.88 Principal axes: T Val= 2.35 Plg= 2 Azm=209 N = 0.34 5 119 P = -2.69 83 325 Best Double Couple:Mo=2.5*10**17 NP1:Strike=305 Dip=43 Slip= -81 NP2: 114 48 -97
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.