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mahina

(17,405 posts)
Mon Nov 28, 2022, 03:25 PM Nov 2022

Natural hazards on the Big Island- understanding rift zones

https://hilo.hawaii.edu/natural-hazards/volcanoes/riftzones.php?fbclid=IwAR1izEnmstDhdXg5KFFttI1juk_C4DMG3r7YQrthq6DgZNXBtsjuTW4cieo
These two maps help make sense out of the eruption news.

Most eruptions originate at the summits and rift zones of Hualālai, Maunaloa , and Kīlauea. Rift zones are areas where the volcano is rifting or splitting apart. The rock in a rift zone has many cracks and is relatively weak, and thus it is easiest for magma to make its way to the surface through these rift zones. Once at the surface, the lava flows downhill, following local topography. Like water, lava seeks the path of least resistance. Areas downhill of rift zones are more likely to be covered by future lava flows than areas on extinct volcanoes. The U.S. Geological Survey provides lava flow hazard maps via the Hawaiian Volcano Observatory.

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