USGS Body-Wave Moment Tensor Solution
ALAMAGAN REG, N. MARIANA ISLANDS
12/11/27 07:34:27.21 Epicenter: 17.684 145.715 MW 5.4 USGS MOMENT TENSOR SOLUTION Depth 192 No. of sta: 30 Moment Tensor; Scale 10**17 Nm Mrr= 0.81 Mtt= 0.17 Mpp=-0.98 Mrt=-0.42 Mrp= 1.13 Mtp=-0.20 Principal axes: T Val= 1.51 Plg=58 Azm=232 N 0.01 17 352 P -1.53 26 90 Best Double Couple:Mo=1.5*10**17 NP1:Strike=346 Dip=73 Slip= 72 NP2: 213 25 135
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.