The 1966 doublet ruptured north of the 19 events and also produced widespread aftershock activity. Some triggered interplate thrusting events occurred as part of this sequence. With an epicenter near the 19 events, the 1997 earthquake appears to have been a shallow intraslab rupture below the megathrust, with strong southward directivity favoring a steeply dipping plane. The focal mechanisms indicate interplate thrusting, but there are differences in waveforms that establish that the events are not exact repeats. Both sequences activated widespread seismicity along the northern Vanuatu subduction zone. The 7 October 2009 earthquakes occurred in close spatial proximity over about 1 h in the same region as the July 1980 doublet. We analyze seismic data from the latter four earthquake sequences to quantify the rupture processes of these large earthquakes. Large earthquake processes in the northern Vanuatu subduction zone Large earthquake processes in the northern Vanuatu subduction zoneĬleveland, K.
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