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  2. Round Mountain (California) - Wikipedia

    en.wikipedia.org/wiki/Round_Mountain_(California)

    The volcano is credited with the creation of the High Valley through repeated eruptions the last of which is thought to have occurred 8,500–10,000 years ago. The result was an elevated valley at approximately 1,600 ft (490 m) in elevation with distinct ridgelines reaching up to 3,000 ft (910 m).

  3. California Volcano Observatory - Wikipedia

    en.wikipedia.org/wiki/California_Volcano_Observatory

    According to USGS risk assessment of the volcanoes in CalVO's region, the following volcanoes were ranked "very high threat potential". [4] Mount Shasta in far-northern California, north of Redding; Lassen Volcanic Center in Lassen Volcanic National Park; Long Valley Caldera in eastern California; Mono-Inyo Craters. These were ranked "high ...

  4. Amboy Crater - Wikipedia

    en.wikipedia.org/wiki/Amboy_Crater

    The most recent eruption was approximately 10,000 years ago. [4] The crater is 944 ft (288 m) above sea level, about 250 ft (76 m) above the surrounding basalt lava plains. The scenic and solitary Amboy Crater was a popular sight and stop for travelers on U.S. Route 66 in California before the opening of Interstate 40 in 1973.

  5. One of California's riskiest volcanoes has been seeing more ...

    www.aol.com/news/more-quakes-one-californias...

    One of California's riskiest volcanoes has for decades been undergoing geological changes and seismic activity, which are sometimes a precursor to an eruption, but — thankfully — no ...

  6. Long Valley Caldera - Wikipedia

    en.wikipedia.org/wiki/Long_Valley_Caldera

    Map of Long Valley Caldera Early winter in Long Valley, 2017. Long Valley Caldera is a depression in eastern California that is adjacent to Mammoth Mountain.The valley is one of the Earth's largest calderas, measuring about 20 mi (32 km) long (east-west), 11 mi (18 km) wide (north-south), and up to 3,000 ft (910 m) deep.

  7. Timeline of volcanism on Earth - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_volcanism_on_Earth

    Supervolcano – Volcano that has had an eruption with a volcanic explosivity index (VEI) of 8; Trans-Mexican Volcanic Belt – Active volcanic belt that covers central-southern Mexico; Volcanic arc – Chain of volcanoes formed above a subducting plate; Volcanic explosivity index – Predictive Qualitative scale for explosiveness of volcanic ...

  8. A powerful volcano is erupting. Here’s what that could mean ...

    www.aol.com/news/powerful-volcano-erupting-could...

    A volcanic eruption is essentially the only natural way for short-lived – less than a few years – gases like sulfur dioxide and water vapor to make it into the stratosphere.

  9. National Volcano Early Warning and Monitoring System

    en.wikipedia.org/wiki/National_Volcano_Early...

    A national volcano data center will coordinate activities among the observatories. [2] A watch office will be operational 24 hours a day, 7 days a week. [11] In addition, the USGS will set up a grants program to support research into techniques for monitoring and analyzing volcanic activity. [9]