USGS/SLU Regional Moment Solution
13/02/02 13:35:35.28 Epicenter: 46.509 14.641 MW 4.0 USGS/SLU REGIONAL MOMENT TENSOR Depth 10 No. of sta: 28 Moment Tensor; Scale 10**15 Nm Mrr=-0.17 Mtt=-0.53 Mpp= 0.70 Mrt= 0.75 Mrp= 0.39 Mtp= 0.70 Principal axes: T Val= 1.34 Plg=26 Azm=301 N -0.16 47 62 P -1.18 32 193 Best Double Couple:Mo=1.3*10**15 NP1:Strike=340 Dip=47 Slip=-175 NP2: 246 86 -43
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.