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Photographer: Barry Swackhamer
Taken: September 23, 2017
Caption: Tsunami Marker
Additional Description: Captions: (map, upper left) The earth's surface consists of a series of "plates." These plates are constantly shifting and sliding over, under, or past each other. When a sudden movement occurs betweenez two plates, we experience an earthquake.; (map, center right) A tsunami can deposit a layer of sea sand in its path. Core samples have been collected along the Necanicum River and the surrounding lowlands for evidence of past tsunamis. Dots show where buried tsunami sand were found.; (diagram, lower left) The Juan de Fuca Plate is moving away from the Juan de Fuca Ridge and is being forced under the overriding North American Plate; this geological process is called subduction.
Submitted: February 8, 2018, by Barry Swackhamer of Brentwood, California.
Database Locator Identification Number: p416114
File Size: 3.696 Megabytes

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