EARTHSC 2GG3 Lecture 3: Podcast 3 | Tsunamis
1 Oct 2016
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The seafloor snaps up, pushing water with it: 2. The sea surface drops to form a trough: 3. Oregon, washington, british columbia, alaska: on average, somewhere around the pacific ocean, a major tsunami forms once a decade, and a. 30-meter-high wave hits once every 20 years: subduction zones off japan, kamchatka, aleutian islands, alaska, mexico, peru, chile, pacific northwest of u. s. are likely sources of tsunami-generating earthquakes. Krakatau, 1883: with krakatau, in 1883, the mountain exploded in an enormous eruption, waves as high as 35 m hit java and sumatra, more than 35,000 people were killed. Cross-section location is the line a a" on the map: also giant cliffs, or pali, amputate the lower slopes of the big island of hawaii in this picture. Velocity of tsunami waves: the velocity of tsunami waves depends on water depth and gravity, tsunami waves in open ocean travel as fast as 870 kilometers per hour and may slow to 150-
