USGS Body-Wave Moment Tensor Solution
ALAMAGAN REG, N. MARIANA ISLANDS
13/01/16 02:38:23.93 Epicenter: 17.448 145.993 MW 5.3 USGS MOMENT TENSOR SOLUTION Depth 91 No. of sta: 19 Moment Tensor; Scale 10**17 Nm Mrr=-0.75 Mtt= 0.81 Mpp=-0.06 Mrt=-0.39 Mrp= 0.85 Mtp=-0.24 Principal axes: T Val= 1.11 Plg=22 Azm=208 N 0.22 23 308 P -1.34 57 80 Best Double Couple:Mo=1.2*10**17 NP1:Strike=137 Dip=71 Slip= -65 NP2: 262 31 -140
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.