An uncommon pattern of earthquake activity at Mount Ruapehu

Mount Ruapehu. Photography: Alan Gibson

GNS Science says Mount Ruapehu is experiencing an “unusual pattern of small earthquakes.”

The crater lake has recently seen a drop in temperature and earlier this month the agency observed minor seismic activity that it described in a statement today as “completely unusual for Rubihu.”

The volcanic alert level remains at 1 and the aviation color code remains at green.

“In early March 2024, we first observed an unusual pattern of small earthquakes in Ruapehu. Subsequent re-examination of the seismic data revealed that these earthquakes began at least in mid-February.

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“The earthquakes are small and were initially difficult to identify without careful examination of the data as they are uncommon in Ruapehu and only larger examples are detected by our automated systems,” the statement said.

“Over the past month, we have seen a maximum of six of these earthquakes per day, and on many days we have had none at all.”

Each earthquake consists of up to 10 minutes of ground shaking and consists of “a number of similar sub-events,” GNS said.

“While we are able to pinpoint the location of some larger examples, the small size and style of activity means that our locations, especially depth, are completely uncertain.

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“However, since they are only recorded by monitoring stations at the top of the volcano, we expect that they originate near the volcano's summit area a few kilometers below the surface.”

GNS said that the earthquakes usually did not last more than 10 minutes, so they do not constitute a volcanic tremor.

The earthquakes were also very different in appearance from the volcanic tremor traditionally seen at Ruapehu.

“Although earthquakes are something new in Ruapehu, and we are working to understand the details of the processes that drive them, they are not thought to pose any concerns about volcanic activity.

“Other monitored parameters have shown no recent changes. The temperature of Te Wai ā-moe (Crater Lake) is now relatively stable at around 24°C, recent observations of the lake have not detected anything unusual, and gas emissions from Ruapehu remain moderate.”

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