Volcano Hazards Program Office

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Stratified 275-m (900-ft) thick mid-Holocene pyroclastic flow and l...

Stratified 275-m (900-ft) thick mid-Holocene pyroclastic flow and l...

Visible relief in the hillside exposure is about 800-900 ft. Dusty assemblage deposit occurred approximately between 5100 and 5500 yr B.P. Magma volume of >5 km3, which is a lot for what was probably one eruptive stage. The source lava dome is gone, apparently having disintegrated entirely during extrusion and subsequent glacial interaction. Beige rocks in the

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Crater Lake bathymetric map showing the geology of the caldera floo...

Crater Lake bathymetric map showing the geology of the caldera floo...

Crater Lake bathymetric map showing the geology of the caldera floor with post-caldera eruptive units. Oregon

USGS HVO geochemist measuring gases released from Kīlauea with a Fo...

USGS HVO geochemist measuring gases released from Kīlauea with a Fo...

USGS HVO geochemist measuring gases released from Kīlauea with a Fourier transform infrared (FTIR) spectrometer, an instrument that detects gas compositions on the basis of absorbed infrared light.

Mount Rainier, Washington simplified hazards map showing potential ...

Mount Rainier, WA simplified hazards map

This map shows areas that could be affected by debris flows, lahars, lava flows, and pyroclastic flows from Mount Rainier if events similar in size to past events occurred today. Because small lahars are more common than large ones, most lahars would be less extensive than the hazard zone shown on the map and a few would be more extensive. The lahar hazard is not equal in

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