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The island surprisingly is not extinct from a volcanic perspective. Rather, it is dormant and is likely to erupt again. It’s last eruption was 40,000 years ago. Note the two tuff rings in this photo.

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Matt Cauthers

Is it true that the big island of Hawaii has a part of it that could slide into the Pacific Ocean generating a tsunami that could hit Los Angeles?

geologyhub

Technically yes. It’s generates small-medium sized tsunamis (Hilina slump) every 50-150 years. However these tend to not be large enough to hit areas outside of Hawaii