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Seismic recording at Ruapehu volcano today (Far West station / Geonet)
An earthquake swarm has been occurring at the volcano since 26 April.
According to Geonet, such seismic swarms indicating small rock-fracturing events have been rare at the volcano in recent years. Ruapehu’s typical seismic activity is rather dominated by events reflecting internal circulation of fluids such as tremor.
Another sign of unrest has been noted as well: the temperature of the crater lake has risen since Mid April from 25 to 40°C, although no other parameter (e.g. chemistry) has changed significantly.
Geonet stated that “we are uncertain of the implications of the recent observations. However at this time these changes at Ruapehu are not considered sufficient to change the Volcanic Alert Level” (which remains at 1).
There is no connection with the recent activity at White Island.
Courtesy of volcanodiscovery.com
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