M 7.1 - 190 km SSW of Sibolga, Indonesia

One person injured and two buildings damaged on Nias. Felt strongly in many parts of northern Sumatera from Padang to Medan. FAULT PLANE SOLUTION: P-Waves NP1:Strike=128 Dip=78 Slip=90 NP2:Strike=308 Dip=12 Slip=90 Principal Axes: (T) Plg=57 Azm=38 (P) Plg=33 Azm=218 Comment: The focal mechanism is poorly controlled and corresponds to reverse faulting. The preferred fault plane is NP2. MOMENT TENSOR SOLUTION Dep 18 No. of sta: 14 Moment Tensor; Scale 10**26 d-cm Mrr=1.12 Mtt=-2.12 Mff=1.00 Mrt=2.31 Mrf=-1.50 Mtf=-0.41 Principal axes: (T) Val=3.32 Plg=49 Azm=57 (N) Val=0.02 Plg=27 Azm=291 (P) Val=-3.35 Plg=29 Azm=185 Best Double Couple:Mo=3.3*10**26 NP1:Strike=228 Dip=29 Slip=23 NP2:Strike=117 Dip=79 Slip=117 CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 12S, 27C M.W.: 12S, 28C Centroid Location: Origin Time 06:49:38.6 0.2 Lat 0.23S 0.02 Lon 97.84E 0.02 Dep 24.7 0.7 Half-duration 13.4 Moment Tensor; Scale 10**26 D-CM Mrr=1.71 0.02 Mtt=-0.67 0.01 Mff=-1.04 0.02 Mrt=4.44 0.18 Mrf=-3.34 0.16 Mtf=0.94 0.01 Principal Axes: (T) Val=5.82 Plg=53 Azm=33 (N) Val=0.01 Plg=4 Azm=128 (P) Val=-5.83 Plg=36 Azm=221 Best Double Couple:Mo=5.8*10**26 NP1:Strike=334 Dip=10 Slip=116 NP2:Strike=128 Dip=81 Slip=86