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Summary: Study suggests mega quake could occur at interval shorter than 100 years NHK

- A recent analysis of a 2025 earthquake near Russia's Kamchatka Peninsula suggests magnitude 9 "megathrust" quakes could occur more frequently than previously believed.
- Researchers found evidence of "overshoot," where earthquake slip exceeded equilibrium stress, releasing strain from both the recent 73 years and a prior 1952 event.
- This phenomenon poses a potential risk for other areas like the Nankai Trough and Sagami Trough, highlighting the need for continued vigilance and preparedness.

A: Hey! Did you hear about something crazy happening near Russia?

B: No! What’s up?

A: Some Japanese researchers studied that big earthquake near Kamchatka. Remember, the one in 2025?

B: Vaguely... what did they find?

A: Apparently, they think huge earthquakes like that could happen more often than we thought!

B: Really? Like, not every hundred years?

A: Exactly! They looked at the 2025 quake and the one in 1952. They’re really close together.

B: Wow! So, what does that mean?

A: It's something they call "overshoot." It means the earthquake released stress from a long time ago… and even some stress that *didn't* get released in 1952!

B: That’s a big word! Overshoot?

A: Yeah, basically it means the earthquake was bigger than it should have been based on how long it had been since the last one.

B: Oh, like the Tohoku quake in 2011?

A: Yep! Same idea.

B: So, we shouldn’t feel safe then?

A: Professor Yagi said exactly that! We can't let our guard down.

B: That’s a bit scary! I wonder if it could happen near us?

A: He mentioned the Nankai Trough and other places too. Just gotta be prepared, I guess.
Summary
Study of 2025 Kamchatka earthquake suggests magnitude 9 "megathrust" quakes may occur more frequently due to "overshoot" – stress release exceeding equilibrium. Risk highlighted for areas like Nankai & Sagami Troughs; vigilance needed. #earthquake #Kamchatka
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2025/12/23 09:02 Anonymous 274 81s 202
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ID: f9465385-0c10-45cc-bbd3-b0285900ccba

Category ID: listed_summary

URL: https://www3.nhk.or.jp/nhkworld/en/news/20251221_12/#summary

Date: Dec. 21, 2025

Notes: 2025-12-21

Created: 2025/12/23 03:40

Updated: 2025/12/23 09:02

Last Read: 2025/12/23 09:02

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