USGS WPhase Moment Solution
OFF W. COAST OF BAJA CALIFORNIA
12/12/14 10:36:1.00 Epicenter: 31.219 -119.550 MW 6.3 USGS/WPHASE CENTROID MOMENT TENSOR 12/12/14 10:36: 1.00 Centroid: 31.219 -119.667 Depth 15 No. of sta: 76 Moment Tensor; Scale 10**18 Nm Mrr=-3.77 Mtt= 1.05 Mpp= 2.73 Mrt= 0.65 Mrp=-0.31 Mtp= 2.19 Principal axes: T Val= 4.23 Plg= 0 Azm=304 N = -0.31 11 34 P = -3.92 78 210 Best Double Couple:Mo=4.1*10**18 NP1:Strike= 23 Dip=45 Slip=-106 NP2: 226 47 -74
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.
