Editing Mount Shasta (section)

=== Volcanic status ===
During the last 10,000 years, Mount Shasta has erupted an average of every 800 years, but in the past 4,500 years the volcano has erupted an average of every 600 years.<ref name="gvp " />
[[File:Diller Canyon.jpg|thumb|left|upright=1.25|Diller Canyon on Shastina from Weed]]

USGS seismometers and GPS receivers operated by UNAVCO form the monitoring network for Mount Shasta. The volcano has been relatively quiet during the 21st century, with only a handful of small magnitude earthquakes and no demonstrable [[Deformation (volcanology)|ground deformation]]. Although geophysically quiet, periodic geochemical surveys indicate that volcanic gas emanates from a fumarole at the summit of Mount Shasta from a deep-seated reservoir of partly molten rock.<ref>https://pubs.er.usgs.gov/publication/sir20185159|California’s Exposure to Volcanic Hazards Scientific Investigations Report 2018-5159 Prepared in cooperation with the California Governor’s Office of Emergency Services and the California Geological Surve</ref>

[[File:Mount Shasta west face.jpg|thumb|right|Mount Shasta's west face as seen from Hidden Valley high on the mountain. The west face gulley is an alternate climbing route to the summit.]]
Mount Shasta can release [[volcanic ash]], pyroclastic flows or [[dacite]] and [[andesite]] [[lava]]. Its deposits can be detected under nearby small towns. Mount Shasta has an explosive, eruptive history. There are [[fumarole]]s on the mountain, which show Mount Shasta is still alive.{{citation needed|date=September 2012}}

The worst-case scenario for an eruption is a large pyroclastic flow, similar to that which occurred in the [[1980 eruption of Mount St. Helens]]. Since there is ice, such as [[Whitney Glacier]] and [[Mud Creek Glacier]], [[lahar]]s would also result.

The [[United States Geological Survey]] monitors Mount Shasta<ref>{{cite web|url=https://volcanoes.usgs.gov/volcanoes/mount_shasta/mount_shasta_monitoring_4.html|title=USGS: Volcano Hazards Program CalVO Mount Shasta|first=Volcano Hazards|last=Program|website=volcanoes.usgs.gov|access-date=23 October 2017|archive-date=11 July 2017|archive-url=https://web.archive.org/web/20170711191818/https://volcanoes.usgs.gov/volcanoes/mount_shasta/mount_shasta_monitoring_4.html|url-status=live}}</ref> and rates it as a very high-threat volcano.<ref>{{cite web|url=http://pubs.usgs.gov/of/2005/1164/2005-1164.pdf|title=An Assessment of Volcanic Threat and Monitoring Capabilities in the United States: NVEWS Framework for a National Volcano Early Warning System|year=2005|publisher=USGS|access-date=2013-07-08|archive-date=2012-07-12|archive-url=https://web.archive.org/web/20120712175227/http://pubs.usgs.gov/of/2005/1164/2005-1164.pdf|url-status=live}}</ref>