The Cook Strait earthquakes page has further information including ongoing response and research on the Cook Strait and Lake Grassmere earthquakes and their aftershocks.
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There will be an aftershock sequence to follow this earthquake, and we already have had one of magnitude 6 and several over magnitude 5. The latest revised forecast for a further magnitude 6 or greater, for the 24 hours from 12:00 pm 21 August, is 2.2%. See the full statistics table.