USGS/SLU Regional Moment Solution
12/10/03 19:51:09 NEVADA Epicenter: 39.720 -119.440 MW 3.4 USGS/SLU REGIONAL MOMENT TENSOR Depth 11 No. of sta: 13 Moment Tensor; Scale 10**14 Nm Mrr=-0.63 Mtt= 0.42 Mpp= 0.21 Mrt= 0.30 Mrp=-0.80 Mtp= 1.21 Principal axes: T Val= 1.58 Plg= 9 Azm=134 N 0.00 48 34 P -1.58 41 233 Best Double Couple:Mo=1.6*10**14 NP1:Strike= 10 Dip=70 Slip=-142 NP2: 265 55 -25
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.