Unusual number of cluster earthquakes under Ruapehu Peak, but alert level remains unchanged, scientists say

Brooke Sabine/Staff

Scientists have recorded 30 earthquakes below Ruapehu Peak since December 30.

An unusual number of cluster earthquakes have been recorded under Ruapheu’s summit since December, but scientists say they have not affected the alert level.

GeoNet has recorded at least 30 distinct tectonic earthquakes located below the summit region from December 30.

When compared to historical records, these vibrations are unusual, GeoNet said in a statement.

The number of earthquakes with epicenters confined to the summit region is unusual.

Read more: * Mount Ruapehu: What volcanic disturbances and increased alert level mean * Ruapehu crater lake heats up, tremors continue * Ruapehu crater lake warms up

EQC

Scientists have launched rocks at a surface in order to better understand how it interacts with a volcanic eruption.

“While these earthquake clusters are uncommon, none of our monitoring data indicates that the volcano is showing increased levels of activity.”

All monitoring data indicate that volcanic disturbance remains at minor levels and that the volcanic alert level remains at level 1.

There was no observable response from other data such as Ruapehu’s crater lake temperature, lake level, or volcanic tremor, so the current GeoNet assessment is that a relatively deep stress release occurred beneath the volcano, which did not affect the volcano’s hydrothermal system.

GeoNet will conduct a scheduled gas expedition and sample crater lake in the coming days, while GNS Science and the National Center for Geo-Hazard Monitoring will continue to closely monitor the mountain for further changes.

GeoNet

The last seismic mass below Ruapehu’s summit.

GeoNet reports that Mount Ruapehu is an active volcano and has the potential to erupt without warning or with little warning when in volcanic turmoil.

“Earthquakes occur regularly in Tongariro National Park, and towards the southern part around Ruapehu, we often record them near Waiuro and the village of the national park.”

Volcanic Alert Level 1 indicates the initial risks expected during volcanic disturbances: discharge of volcanic steam and gas, earthquakes, landslides, and hydrothermal activity. While Volcanic Alert Level 1 is mostly associated with environmental hazards, eruptions can still occur with little or no warning.

There are two broad types of earthquakes at volcanoes: volcanic earthquake, which includes tremor, which is directly related to the movement of fluids—magma and/or the hydrothermal system—and tectonic earthquakes, which result from rock fractures (movement on small faults).

For information on getting to the Mt Ruapehu area, visit the Department of Conservation websites on Volcanic Hazards in Tongariro National Park and follow their Facebook page for further updates.

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