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The magnitude of the Taupo earthquake increased after nearly 700 aftershocks

The magnitude of the Taupo earthquake increased after nearly 700 aftershocks

 


GeoNet updated the magnitude of the earthquake that occurred in Lake Taupo on November 30 based on updated data about ground shaking, landslides, volcanic activity, and the tsunami that occurred.

The quake, previously reported at a magnitude of 5.6, has now been raised to a magnitude of 5.7 with more than 680 aftershocks recorded, the latest on Monday.

GeoNet says this change reflects the greater accuracy in its measurements since the event, with this number of aftershocks being more in line with an earthquake of magnitude 5.7.

“The magnitude and rate of aftershocks are beginning to decrease but are expected to continue for several weeks,” GeoNet says.

The probability of another earthquake of magnitude five or greater in the next 30 days is estimated to be extremely unlikely at 11%.

GeoNet says a small tsunami was generated by the earthquake in Lake Taupo that pushed debris nearly a meter above lake level in parts, causing significant foreshore and beach washout at Wharewaka Point and leaving pumice 40 meters inland.

The magnitude 5.7 quake resulted in more than 30 landslides, which GeoNet says is “not expected, given the intensity of the shaking and the timing of the quake, which followed several weeks of particularly wet weather.”

Most of these were small slides from steep cliffs near the roads but larger rock falls were identified near the epicenter by Hatepe.

On the White Cliffs along the eastern shore of the lake, “a several hundred meter long (although relatively shallow) section of cliffs collapsed into the lake, creating a large white column of sediment that can still be seen extending north along the coast.” Several days later,” says GeoNet.

They are investigating the possibility of an underwater landslide at Wharewaka Point, causing 170 meters of shoreline to subside.

GeoNet says: “Underwater landslides are known to be some of the largest landslides on Earth and can trigger tsunamis, however, there is currently no evidence to suggest that the landslide at Wharewaka Point caused larger tsunamis on a global scale.” the lake”.

Although there has been minor volcanic activity at Taupo volcano since May 2022, GeoNet says it is within the expected range and corresponds to “small volcanic disturbances,” and does not warrant a volcanic alert level raise.

Prior to the November earthquake, they say “the disturbances were marked by hundreds of small earthquakes, usually imperceptible, and a few larger events (M3.5 to M4.2)…None of these earthquakes were of the volcanic type.”

Taupō has recorded 18 periods of volcanic unrest in the past 150 years and none of them resulted in an eruption.

Sources

1/ https://Google.com/

2/ https://www.1news.co.nz/2022/12/14/taupo-quake-magnitude-raised-after-nearly-700-aftershocks/

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