USGS Body-Wave Moment Tensor Solution
BALLENY ISLANDS REGION
13/01/22 08:40:51.54 Epicenter: -61.313 154.077 MW 5.4 USGS MOMENT TENSOR SOLUTION Depth 8 No. of sta: 12 Moment Tensor; Scale 10**17 Nm Mrr= 0.20 Mtt= 1.10 Mpp=-1.29 Mrt=-0.32 Mrp=-0.11 Mtp=-0.89 Principal axes: T Val= 1.45 Plg=12 Azm=197 N 0.16 76 46 P -1.61 7 289 Best Double Couple:Mo=1.5*10**17 NP1:Strike=334 Dip=77 Slip= 4 NP2: 243 86 167
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.