USGS Body-Wave Moment Tensor Solution
OFF COAST OF CENTRAL AMERICA
13/03/10 10:18:17.92 Epicenter: 12.809 -90.694 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 5 No. of sta: 27 Moment Tensor; Scale 10**17 Nm Mrr=-1.36 Mtt= 1.13 Mpp= 0.24 Mrt= 1.08 Mrp=-1.55 Mtp=-0.47 Principal axes: T Val= 2.17 Plg=27 Azm= 37 N 0.28 13 134 P -2.44 60 247 Best Double Couple:Mo=2.3*10**17 NP1:Strike= 98 Dip=21 Slip=-128 NP2: 318 73 -77
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.