USGS/SLU Regional Moment Solution
11/05/11 16:47:26 SPAIN Epicenter: 37.700 -1.560 MW 5.1 USGS/SLU REGIONAL MOMENT TENSOR Depth 19 No. of sta: 10 Moment Tensor; Scale 10**16 Nm Mrr= 0.84 Mtt=-5.02 Mpp= 4.18 Mrt=-0.47 Mrp= 1.89 Mtp=-0.42 Principal axes: T Val= 5.07 Plg=24 Azm=266 N 0.00 65 97 P -5.07 4 358 Best Double Couple:Mo=5.1*10**16 NP1:Strike=310 Dip=76 Slip= 159 NP2: 45 70 15
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.