USGS Body-Wave Moment Tensor Solution
CENTRAL MID-ATLANTIC RIDGE
13/02/18 03:40:49.26 Epicenter: 5.594 -32.943 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 6 No. of sta: 19 Moment Tensor; Scale 10**17 Nm Mrr=-0.33 Mtt=-2.54 Mpp= 2.87 Mrt=-0.87 Mrp=-0.09 Mtp=-1.04 Principal axes: T Val= 3.07 Plg= 1 Azm=259 N -0.05 72 165 P -3.02 18 350 Best Double Couple:Mo=3.0*10**17 NP1:Strike=126 Dip=78 Slip=-166 NP2: 33 76 -12
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.