Earthquake cluster: Geonet’s three scenarios for the coming month as aftershocks continue

Kristel Yardley / Staff

Coast residents have been evacuated to higher ground after earthquakes and tsunami warnings on Friday. Pictured is cars near the Ōhope Scenic Reserve.

Dozens of aftershocks in the aftermath of earthquakes and tsunami warnings on Friday are not bad news.

In fact, the activity is in line with the likely GNS Science scenario watchdog agency linked.

This means that aftershocks, which are less intense than Friday’s quakes, will become less frequent over the next month.

But the GNS is warning people to stay alert because recent activity still raises the possibility of something bigger happening.

Read more: * A ‘moderate’ 6.1m earthquake reported off the east coast * After 3 major earthquakes off New Zealand, there are still questions about how to connect them.

“Obviously, the longer we stay [something larger] This is less likely to happen, said Matt Gerstenberger, a seismologist at GNS Science.

Three major earthquakes struck Aotearoa on Friday, and tsunami warnings and evacuations were issued in Northland and the coastal towns of Bay of Plenty.

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Disaster Response Officer interviewed on 1 NEWS at Six.

The GNS had two other possible scenarios for what might happen next.

It was another similar earthquake of around 8.0 magnitude – rated highly unlikely, or a larger earthquake of magnitude 8.5 or greater – rated highly unlikely.

So far, the many activities fit well with the first scenario: aftershocks that fade over time.

“If anything, it is even at the lower end of the aftershocks we are expecting. We don’t know for sure, but it follows.” [scenario one]. “

Gerstenberger said this means that earthquakes of magnitude 6.1 reported on Saturday afternoon are “completely predictable”.

By early Sunday afternoon, there were about 185 Vassals with strength of 4 degrees or more in the East Cape.

One was greater than 6.

GNS Science

The aftershocks numbers revolve around what GNS Science predicted, according to the scenario it considered likely to follow Friday’s earthquakes. This image shows aftershocks recorded as of 1.10 pm on Sunday, March 7.

It is difficult for the GNS to record earthquakes on the Kermadecs Islands due to the distance, but more is expected there as it was the site of the strongest earthquake.

Gersteinberger said there could have been more than 37 at least 4 aftershocks on the Richter scale – and four on a scale of 6 and above – recorded by the GNS.

He said that a global seismic network recorded 100 degrees on the Richter scale 4 and above, but even that would not be the complete picture.

Gerstenberger said aftershocks tend to occur in clusters rather than steadily decreasing.

“You get a handful for a while, then they cool down, then you get a handful for a while.”

Most of the time, nothing is bigger than the main shock. That’s kind of what those scenarios show – there’s a lot of earthquakes, but they’re all smaller. But there is always some possibility of something bigger happening. “

Scientists are watching two separate sequences after Friday’s earthquakes, and they’re still working to figure out how they relate.

One stems from the shock of the Eastern Cape – an early morning magnitude 7.1 earthquake.

The other is related to subsequent earthquakes in the Carmadec Islands, which had magnitudes of 7.4 and 8.1.

Lawrence Smith / Stuff

There is still an increased likelihood of a tsunami, so people need to be careful. Pictured is Northland residents on Friday.

Tsunamis could be in this mix as well.

Gersteinberger said scientists will usually begin to look more closely at the probability when earthquakes are of magnitude 7.1, 7.2, or greater.

“What matters in the end is the displacement, so compensating for the sea floor … the distance from the shore doesn’t really matter because tsunamis can travel long distances.”

However, there are rare instances of tsunami earthquakes, which are recorded as being less powerful but releasing enough energy to cause a wave.

And because there was still an increased likelihood of a larger earthquake or tsunami, Gerstenberger reminded people to stay alert and remember the message “If it’s long or strong, go.”

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