USGS Body-Wave Moment Tensor Solution
12/09/20 21:03:42.75 Epicenter: -20.765 -178.442 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 566 No. of sta: 30 Moment Tensor; Scale 10**17 Nm Mrr=-2.38 Mtt= 1.57 Mpp= 0.80 Mrt=-4.12 Mrp= 1.03 Mtp=-1.54 Principal axes: T Val= 4.99 Plg=29 Azm=208 N -0.02 12 111 P -4.97 58 1 Best Double Couple:Mo=5.0*10**17 NP1:Strike=108 Dip=75 Slip=-102 NP2: 329 19 -51
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.