A Volcanic Borderland
The West Coast of the continental United States lies along the Pacific Ring of Fire, a zone of intense tectonic and volcanic activity responsible for much of the world’s earthquakes.
The American Northwest has the country’s highest concentration of active volcanoes. They rise along the Cascade Mountains through Washington, Oregon, and northern California. Mount St. Helens demonstrated the danger in 1980, when its eruption became one of the region’s most devastating volcanic events.
Hawaii also consists of volcanic islands. Kilauea has been erupting since 1983, although Hawaiian eruptions have not typically caused widespread harm to island inhabitants.
Earthquakes from California to Alaska
California and southern Alaska are particularly vulnerable to earthquakes. The 1906 San Francisco earthquake and the 1964 Good Friday earthquake near Anchorage showed how seismic events can damage cities and infrastructure on a massive scale.
California experiences minor earthquakes regularly, and major structures are required to resist seismic forces. Between 2010 and 2012, roughly 100 significant earthquakes occurred annually, compared with a previous average of 21. This increase was believed to be connected to deep wastewater disposal from hydraulic fracturing, although none exceeded magnitude 5.6 and no deaths were recorded.
Landscapes Built by Motion
Tectonic activity does more than create disasters. It helps produce the mountains, volcanic peaks, valleys, and rugged coastlines that define the American West.
The lesson is unsettling but powerful: some of the country’s most beautiful scenery exists because the ground beneath it is constantly changing.