M 6.8 - 13 km SSE of Chojata, Peru

Slight damage (VI) at Tacna. Felt (V) at Ilo and Arequipa. Also felt (III) at La Paz, Bolivia. Depth from broadband displacement seismograms. FAULT PLANE SOLUTION: P-Waves NP1:Strike=320 Dip=70 Slip=-100 NP2:Strike=167 Dip=22 Slip=-64 Principal Axes: (T) Plg=24 Azm=58 (P) Plg=64 Azm=214 Comment: The focal mechanism is moderately well controlled and corresponds to left-lateral strike-slip faulting with a small right-lateral strike-slip component. The preferred fault plane is NP1. RADIATED ENERGY No. of sta: 8 Focal mech. F Energy 7.8+2.7*10**14 Nm MOMENT TENSOR SOLUTION Dep 127 No. of sta: 14 Moment Tensor; Scale 10**19 Nm Mrr=-1.53 Mtt=-0.02 Mff=1.55 Mrt=0.89 Mrf=-2.20 Mtf=-0.79 Principal axes: (T) Val=3.10 Plg=27 Azm=68 (N) Val=-0.35 Plg=0 Azm=158 (P) Val=-2.75 Plg=63 Azm=249 Best Double Couple:Mo=2.9*10**19 NP1:Strike=156 Dip=18 Slip=-92 NP2:Strike=338 Dip=72 Slip=-90 Comment: CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 23S, 69C M.W.: 17S, 38C Centroid Location: Origin Time 20:51: 3.0 0.2 Lat 16.69S 0.02 Lon 70.68W 0.03 Dep 126.9 0.8 Half-duration 6.0 Moment Tensor; Scale 10**19 Nm Mrr=-1.93 0.03 Mtt=0.81 0.02 Mff=1.13 0.03 Mrt=0.16 0.02 Mrf=-0.96 0.03 Mtf=-0.87 0.03 Principal Axes: (T) Val=2.03 Plg=12 Azm=53 (N) Val=0.18 Plg=11 Azm=146 (P) Val=-2.21 Plg=73 Azm=276 Best Double Couple:Mo=2.1*10**19 NP1:Strike=129 Dip=34 Slip=-110 NP2:Strike=333 Dip=58 Slip=-77