• Halema`uma`u Just Before Dawn

    Hawai'i Volcanoes

    National Park Hawai'i

After Dark in the Park Video Archives - May 25 2010

Hawai`i Island as a Source of Tsunamis

During large earthquakes, the flanks of Hawai`i's great volcanoes, pushed outward by gravity and magma pressure, sometimes lurch seaward. Large earthquakes, similar to the one in Kalapana in 1975, can produce tsunami waves more than 45 feer high. Join Gerard Fryer, a geophysicist at the Pacific Tsunami Warning Center, to learn how local tsunamis form and how the PTWC intends to send a warning within minutes. Learn about mega-tsunamis, produce by gigantic landslides and reaching as high as a thousand feet, and why they're unlikely until after the next ice age.

 
Length 01:11:38
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Did You Know?

Lei made of `a`ali`i and native ferns.

`A`ali`i (Dodonaea viscosa) is an important shrub with many traditional Hawaiian uses. Its hard and durable wood makes a fine spear. Seed pods are fashioned into beautiful lei, while its red capsules can be boiled to make dye.