Volcanoes
Volcanoes
When the subducting plate's water-containing rocks reach great enough depths, the high temperatures and pressures enable melting, forming molten magmas and pressurized gases. When these rise to the surface, they may erupt explosively or slowly, spreading lava, ash and gases.
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Coastal and Marine Geohazards of the U.S. West Coast and Alaska
Coastal and marine geohazards are sudden and extreme events beneath the ocean that threaten coastal populations. Such underwater hazards include earthquakes, volcanic eruptions, landslides, and tsunamis.
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, 3-D CT Core Imaging Laboratory, Core Preparation and Analysis Laboratory and Sample Repositories, Big Sur Landslides, Deep Sea Exploration, Mapping and Characterization, Subduction Zone Science
USGS-developed lahar detection systems provide warning of lahars
USGS scientists developed an inexpensive, durable, portable, and easily installed system to detect and continuously monitor the arrival and passage of debris flows and floods in river valleys draining active volcanoes.
Volcanoes
As the 1980 Mount St. Helens eruption showed, volcanoes pose significant threats to U.S. communities. Potential hazards posed by U.S. volcanoes include tephra falls, pyroclastic flows and surges, VOG, ballistic projectiles, lahar and lava flows. In collaboration with researchers from the USGS Volcano Hazards Program, the Hazards Vulnerability Team worked on better understanding and communicating...