USGS Body-Wave Moment Tensor Solution
OFF THE COAST OF GUATEMALA
12/10/05 18:22:57.78 Epicenter: 13.032 -91.557 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 60 No. of sta: 24 Moment Tensor; Scale 10**17 Nm Mrr= 0.50 Mtt= 1.50 Mpp=-2.00 Mrt= 0.88 Mrp=-0.40 Mtp= 0.29 Principal axes: T Val= 2.02 Plg=30 Azm=359 N 0.10 58 155 P -2.12 11 263 Best Double Couple:Mo=2.1*10**17 NP1:Strike=134 Dip=77 Slip= 30 NP2: 37 61 166
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.