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Hazard zone boundaries from the volcano hazards assessment for the Lassen region, Northern California

Dates

First Processing Date
2012-09-25
Publication Date

Citation

Robinson, J.E., Clynne, M.A., and Muffler, L.J.P., 2019, Hazard zone boundaries from the volcano hazards assessment for the Lassen region, Northern California: U.S. Geological Survey data release, https://doi.org/10.5066/P9SG00U6.

Summary

This report evaluates the volcano-related hazards, including regional mafic lava flows, silicic lava domes, pyroclastic flows, lahars, and volcanic ash, of the Lassen region, California, which is here defined as an area between the Pit River on the north and the southern limit of active Cascade volcanism, approximately 5–10 km south of the southern boundary of Lassen Volcanic National Park. Most active volcanism occurs in a zone about 40 km wide between Viola on the west and the eastern boundary of Caribou Wilderness Area, but sparser volcanism in the west extends the width of this zone to about 75 km. All vents and deposits known or estimated to be less than 100,000 years are identified and considered in establishing the hazard zones.

Contacts

Attached Files

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LassenHazardBoundaries.png thumbnail 2.2 MB image/png
LassenVolcanicCenterHazardBoundaries.met 9.94 KB text/plain
LassenVolcanicCenterHazardBoundaries.zip 1.17 MB application/zip

Purpose

The purpose of this data release is to delineate the boundaries of volcanic hazards from the Lassen Volcanic Center, including lava flows, pyroclastic flows, lahars, and thick accumulations of ash. Use caution when interpreting hazard boundaries. Hazard boundaries are not sharp, but gradational and approximately located. The degree of hazard does not change abruptly at the boundary, instead it gradually decreases away from the volcanic vent, and for lahars, floods, and lava flows it rapidly decreases with increasing elevation above the valley floor.

Additional Information

Identifiers

Type Scheme Key
DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/P9SG00U6

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