What is a low velocity zone and why should I care?

Schematic of low velocity zone http://www.iris.edu/hq/files/workshops/2012/06/docs/scihi/WebPages/0006.html

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Islas REVILLAGIGEDO (MX) – SAN BENEDICTO > VOLCÁN BÁRCENA

3D rendered image of Isla Benedicto from Google Earth.

The Revillagigedo Islands were discovered in 1533 by the Spanish conquistador Fernando de Grijalva; named by, and after himself, the Count of Revillagigedo who ordered the islands to be occupied in 1790. They are solitary remote islands, of interest only to military, scientists and adventurers; not much has been written about them over time. They gained some fame when Alexander von Humboldt mused about them in 1811, and in 1905 a ship reported that the islands had disappeared from sight.

Ongoing eruptions at Bogoslof Volcano Eruption of December 2016 – January 2017

Initial plume from Bogoslof on Dec. 20, 2016. Photo courtesy AVO via NYT. http://www.nytimes.com/2016/12/30/science/an-alaskan-volcano-bogoslof-erupts-largely-out-of-view.html?ref=oembed&_r=0