M7.4 earthquake 47 km NW of Isangel, Vanuatu

Felt (VIII) on Erromango and Tanna; (VI) at Port Vila. Two events about 2.2 seconds apart. Depth from broadband displacement seismograms, based on first event. FAULT PLANE SOLUTION: P-Waves NP1:Strike=175 Dip=67 Slip=90 NP2:Strike=355 Dip=23 Slip=90 Principal Axes: (T) Plg=68 Azm=85 (P) Plg=22 Azm=265 Comment: The focal mechanism is moderately well controlled and corresponds to reverse faulting. The preferred fault plane is NP2. RADIATED ENERGY No. of sta: 16 Focal mech. M Energy 2.9+0.6*10**15 Nm MOMENT TENSOR SOLUTION Dep 152 No. of sta: 21 Moment Tensor; Scale 10**19 Nm Mrr=2.59 Mtt=-0.64 Mff=-1.95 Mrt=-1.89 Mrf=-1.81 Mtf=3.91 Principal axes: (T) Val=5.24 Plg=45 Azm=139 (N) Val=0.02 Plg=45 Azm=322 (P) Val=-5.27 Plg=1 Azm=230 Best Double Couple:Mo=5.3*10**19 NP1:Strike=284 Dip=59 Slip=34 NP2:Strike=175 Dip=61 Slip=144 CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 40S, **C M.W.: 38S, **C Centroid Location: Origin Time 19:24:37.9 0.1 Lat 19.17S FIX;Lon 168.83E FIX Dep 141.1 0.3 Half-duration 12.3 Moment Tensor; Scale 10**20 Nm Mrr=0.51 0.01 Mtt=0.07 0.00 Mff=-0.58 0.00 Mrt=-0.34 0.00 Mrf=-1.10 0.00 Mtf=0.73 0.00 Principal Axes: (T) Val=1.52 Plg=47 Azm=129 (N) Val=-0.11 Plg=32 Azm=357 (P) Val=-1.41 Plg=25 Azm=250 Best Double Couple:Mo=1.5*10**20 NP1:Strike=293 Dip=35 Slip=21 NP2:Strike=185 Dip=78 Slip=123