geonet.org.nz/earthquake/ 300511 magnitude 5.5 Ruatoria

geonet.org.nz/earthquake/ 300511 magnitude 5.5 Ruatoria

Strong earthquake rattles North Island’s east coast
Today’s magnitude 5.5 earthquake near Ruatoria was felt or detected strongly the length and breadth of New Zealand, barring the seismometers at the northern- and southern-most tips of NZ only. This was significant. It follows another magnitude 5.5, a Kermadec Islands quake a day earlier, which seems to have escaped the New Zealand scientific record entirely – http://www.geonet.org.nz/earthquake/quakes/recent_quakes.html – though not the international record: http://quakes.globalincidentmap.com/map_detail.php?id=113884

290511 Kermadec Islands magnitude 5.5 quake

290511 Kermadec Islands magnitude 5.5 quake

Having watched for the earlier quake and all seismometers since – which show some sign of heightened deep tectonic motion beneath all NZ – I think it is fair to issue a fresh warning for all New Zealanders to keep their household emergency preparedness plans up to date, with stocked water, food and cooking means etc at hand.

300511 Geonet recentQuakes all over plate boundary

300511 Geonet recentQuakes all over plate boundary & magma zones: excludes far-north & far-south

The day's heat cranking up the seismic action, in Pawanui, Hawke's Bay etc

The day's heat cranking up the seismic action, in Pawanui, Hawke's Bay etc

Lake Taupo, Ruapehu mountains under constant daily seismic effect

Lake Taupo, Ruapehu etc volcanic peaks, under constant daily seismic effect

~ Kia ora

Postscript. Two day’s later, some authoritative event analysis became available: May 31 2011 – Earthquake swarm under Lake Taupo “A swarm of earthquakes occurred over the weekend under southern Lake Taupo …” GNS

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