Episodes during which gases, ash, and lava (molten rock) escape from vents in the earth's crust, accompanied by minor tremors.
Mauna Loa -- history, hazards and risk of living with the world's largest volcano [ More info] Describes volcano-related hazards on the Island of Hawaii, including lava flows, explosive eruptions, volcanic smog, damaging earthquakes, and tsunamis.
Mauna Loa current activity [ More info] Current activity of Mauna Loa Volcano with news, GPS data, electronic tiltmeter data, and current seismicity plus links to long term monitoring.
Mauna Loa, Earth's largest volcano [ More info] Current activity, hazards, and history of eruptions of Mauna Loa.
Monitoring data of the Long Valley caldera and Mono-Inyo Craters volcanic chain, California [ More info] Describes the monitoring effort and provides real-time data of the current restless activity of the caldera, including earthquakes, ground deformation, and release of volcanic gas and plus link to volcano monitoring techniques.
Most recent updates for U.S. volcanoes [ More info] Short descriptions of recent volcanic activity in the US.
Mount Rainier - Living Safely With a Volcano in Your Backyard [ More info] One of our Nation's most dangerous volcanoes, Mount Rainier has been the source of countless eruptions and volcanic mudflows, and many people live in the areas that will be affected by it.
Mount St. Helens, 1980 to now--what's going on? [ More info] Summarizes the eruptions of this spectacular volcano and the consequences for the surrounding landscape, explains how volcanoes like this form, and how we monitor their activity to mitigate hazards they pose.
Natural Hazards - A National Threat [ More info] Describes the role USGS plays in reducing losses from natural disasters, itemizing specific information we develop and maintain to help mitigate or avoid these problems.
Natural Hazards - Volcanoes [ More info] News and related information focusing on the hazards associated with volcanoes in the United States.
Natural Hazards Gateway [ More info] News and related information about the importance of seven major types of natural hazards in the United States: earthquakes, floods, wildfires, hurricanes, landslides, volcanoes, and tsunamis.
Alphabetical Index of Topics
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