M 5.9 - 20 km W of Santa Cruz da Graciosa, Portugal

Several people injured slightly and minor damage (VI) on Graciosa. Felt (V) on Terceira and (IV) on Faial, Pico and Sao Jorge. Depth from broadband displacement seismograms. FAULT PLANE SOLUTION: P-Waves NP1:Strike=187 Dip=83 Slip=175 NP2:Strike=278 Dip=85 Slip=7 Principal Axes: (T) Plg=8 Azm=142 (P) Plg=1 Azm=52 Comment: The focal mechanism is moderately well controlled and corresponds to strike-slip faulting with a small normal component. The preferred fault plane is not determined. RADIATED ENERGY No. of sta: 7 Focal mech. M Energy 0.6+0.2*10**14 Nm MOMENT TENSOR SOLUTION Dep 33 No. of sta: 13 Moment Tensor; Scale 10**17 Nm Mrr=0.63 Mtt=-1.91 Mff=1.28 Mrt=1.51 Mrf=-1.01 Mtf=-6.27 Principal axes: (T) Val=6.65 Plg=16 Azm=51 (N) Val=0.18 Plg=73 Azm=248 (P) Val=-6.83 Plg=5 Azm=143 Best Double Couple:Mo=6.7*10**17 NP1:Strike=188 Dip=75 Slip=8 NP2:Strike=96 Dip=82 Slip=165 CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 17S, 44C Centroid Location: Origin Time 10:38:45.7 0.3 Lat 39.11N 0.03 Lon 28.32W 0.06 Dep 15.0 FIX Half-duration 3.0 Moment Tensor; Scale 10**17 Nm Mrr=-4.45 0.13 Mtt=3.82 0.19 Mff=0.63 0.14 Mrt=1.77 0.52 Mrf=-2.04 0.42 Mtf=-2.19 0.15 Principal Axes: (T) Val=5.57 Plg=14 Azm=29 (N) Val=-0.29 Plg=11 Azm=122 (P) Val=-5.28 Plg=72 Azm=248 Best Double Couple:Mo=5.4*10**17 NP1:Strike=105 Dip=32 Slip=-110 NP2:Strike=308 Dip=60 Slip=-78