Ocean Sensors Record Rare Triple Tsunami near New Zealand

In tsunami-prone regions, an earthquake is a cue to head to higher ground. But deadly waves can still be on the way if a temblor is felt only weakly—or not at all. Now, researchers working in the southwestern Pacific Ocean have deployed a new suite of ocean-based sensors to detect tsunamis directly. And earlier this year, the instruments spotted a rare triple tsunami caused by three tsunamigenic earthquakes that struck within hours of one another.

Measure the Wave

A fault rupture, specifically, the vertical thrust produced by a converging subduction plate boundary, can be a recipe for a tsunami. But inferring a tsunami’s severity…

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