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Increased seismic activity at Mount Shasta in northern California, US

 
AKObserver

User ID: 31831901
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06/22/2013 10:01 PM

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Increased seismic activity at Mount Shasta in northern California, US
Increased seismic activity at Mount Shasta in northern California, US
Mount Shasta volcano showed signs of elevated seismicity since June 11, 2013. The volcano typically displays a relatively low rate of earthquake occurrence. Earthquake-Report connects the recent uptick in seismicity at Mount Shasta, the Greenville earthquake sequence, several deep (30-40 km depth) events beneath the Klamath Mountains to the west, as well as recent small earthquakes at Lassen Peak; and related them with ended slow-slip event along the subducted slab beneath the region. Slow-slip occurs when the overlying crustal plate periodically (and only partially) detaches from the underlying (subducting) oceanic plate and slowly slips (millimeters/day) westward (contrary to its normal eastward movement) over a period of days to weeks. The events occur about every 14 months beneath Washington and British Columbia, about every two years beneath Oregon (one just occurred there earlier this year!), and yearly beneath Northern California.
[link to thewatchers.adorraeli.com]
AKObserver (OP)

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06/22/2013 10:03 PM

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Re: Increased seismic activity at Mount Shasta in northern California, US
Dynamic Maps


Nationalatlas.gov™ contains a remarkable range of products and services to meet the diverse needs of people who are looking for maps and geographic information about America. Dynamic maps are innovative illustrations of geographic phenomena. We combine the science of mapping with today's multimedia to offer maps that are useful, understandable, and that stimulate interactivity.
[link to www.nationalatlas.gov]
AKObserver (OP)

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06/22/2013 10:04 PM

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Re: Increased seismic activity at Mount Shasta in northern California, US
Mt.Shasta webcam
[link to www.shastacam.com]
AKObserver (OP)

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06/22/2013 10:05 PM

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Re: Increased seismic activity at Mount Shasta in northern California, US
Two of the main eruptive centers at Mount Shasta, the Shastina and Hotlum cones were constructed in the last 10,000 years. Holocene eruptions also occurred at Black Butte, a group of overlapping dacite domes about 13 kilometers (8 miles) west of Mount Shasta. Evidence of geologically recent eruptions at these two main vents and at flank vents forms the chief basis for assessing the most likely kinds of future eruptive activity and associated potential hazards.
As Mount Shasta has erupted within the past 250 years and several communities are within this hazard radius, the U.S. Geological Survey’s California Volcano Observatory actively monitors the volcano for signs of activity. All volcanoes monitored by CalVO's telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Real-time monitoring networks are in place at Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Caldera, Mono-Inyo Chain and Mount Shasta.
[link to thewatchers.adorraeli.com]

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