Lahar

A mudflow composed chiefly of volcaniclastic materials on the flank of a volcano. The debris carried in the flow includes pyroclasts, blocks from primary lava flows, and epiclastic material. Syn: mudflowNeuendorf, K.K.E., Mehl, J.P., Jr., and Jackson, J.A., eds., 2011, Glossary of Geology: Alexandria, Virginia, American Geological Institute, 799 p.

Below is a list of publications related to Lahar. Select a publication number to access more detailed information and their respective files available for download.

RDF 2026-12

Larsen, J.F., Schaefer, J.R., Dietterich, H.R., Vallance, J.W., Rosenkrans, H.S., Van Eaton, Alexa, Wallace, K.L., Kleiner, Wil, and Hatfield, Virginia, 2026, Stratigraphic and electron microprobe data for Holocene tephra from Makushin Volcano, Alaska, and for interbedded tephra from other volcanoes located among or near the islands of the eastern Aleutians: Alaska Division of Geological & Geophysical Surveys Raw Data File 2026-12, 5 p. https://doi.org/10.14509/32059

RDF 2025-2

Coombs, M.L., Cameron, C.E., Gardner, C.A., Larsen, J.F., Fierstein, J.E., Loewen, M.W., Izbekov, P.E., and Dietterich, H.R., 2025, Previously unpublished whole-rock major- and trace-element compositions of volcanic samples from the Alaska Peninsula-Aleutian arc, Alaska: Alaska Division of Geological & Geophysical Surveys Raw Data File 2025-2, 9 p. https://doi.org/10.14509/31455

IC 98

Wallace, K.L., Waythomas, C.F., Coombs, M.L., and Nastan, A.M., 2025, Mount Spurr Volcano: Alaska Division of Geological & Geophysical Surveys Information Circular 98, 2 p. https://doi.org/10.14509/31518

Hubbard, T.D. and Daanen, R.P., 2025

Hubbard, T.D., and Daanen, R.P., 2025, Debris flow hazard evaluation in Sitka, Alaska (poster): American Geophysical Union Conference, December 9-13, 2024: Alaska Division of Geological & Geophysical Surveys, 1 sheet. https://doi.org/10.14509/31474

PIR 2021-1

Larsen, J.F., Waythomas, C.F., Mulliken, K.M., Izbekov, Pavel, and Cameron, C.E., 2021, Major-element oxide, trace element, and glass compositional analyses from Holocene to historical eruptions from Pavlof Volcano, Alaska: Alaska Division of Geological & Geophysical Surveys Preliminary Interpretive Report 2021-1, 20 p. https://doi.org/10.14509/30580

IC 67

Mulliken, K.M., 2018, The Alaska Volcano Observatory: 30 years of protecting Alaskans from the effects of volcanic activity (1988-2018): Alaska Division of Geological & Geophysical Surveys Information Circular 67, 2 p. https://doi.org/10.14509/30032

RI 2017-10

Schaefer, J.R., Scott, W.E., and Layer, P.W., 2017, Geologic map of Mount Chiginagak volcano, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2017-10, 32 p., 1 sheet, scale 1:25,000. https://doi.org/10.14509/29769

DDS 13

Cameron, C.E., and Snedigar, S.F., 2016, Alaska Volcano Observatory image database: Alaska Division of Geological & Geophysical Surveys Digital Data Series 13, https://avo.alaska.edu/image/. https://doi.org/10.14509/29689

RI 2015-7

Reger, R.D., Stevens, D.S.P., and Koehler, R.D., 2015, Surficial geology of the Tyonek area, south-central Tyonek Quadrangle, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2015-7, 38 p., 1 sheet, scale 1:63,360. https://doi.org/10.14509/29471

RI 2015-2

Larsen, J.F., Neal, C.A., Schaefer, J.R., Kaufman, A.M., and Lu, Zhong, 2015, The 2008 phreatomagmatic eruption of Okmok Volcano, Aleutian Islands, Alaska: Chronology, deposits, and landform changes: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2015-2, 53 p. https://doi.org/10.14509/29405

RI 2014-5

Stelling, P.L., Beget, J.E., Gardner, J.E., and Schaefer, J.R., 2014, Preliminary volcano-hazard assessment for Fisher volcano, Unimak Island, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2014-5, 32 p., 1 sheet, scale 1:500,000. https://doi.org/10.14509/29146

RI 2014-2

Herriott, T.M., Nye, C.J., Reger, R.D., Wartes, M.A., LePain, D.L., and Gillis, R.J., 2014, Geologic context, age constraints, and sedimentology of a Pleistocene volcaniclastic succession near Mount Spurr volcano, south-central Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2014-2, 35 p. https://doi.org/10.14509/27261

P 1810

Bacon, C.R., Neal, C.A., Miller, T.P., McGimsey, R.G., and Nye, C.J., 2014, Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak volcano, Alaska Peninsula: U.S. Geological Survey Professional Paper 1810, 74 p.

B 2139

Keith, T.E.C., 1995, The 1992 eruptions of Crater Peak vent, Mount Spurr Volcano, Alaska: U.S. Geological Survey Bulletin 2139, 220 p.

PR 99

Decker, J.E., Reifenstuhl, R.R., Robinson, M.S., Waythomas, C.F., and Clough, J.G., 1995, Geology of the Sleetmute A-5, A-6, B-5, and B-6 quadrangles, southwestern Alaska: Alaska Division of Geological & Geophysical Surveys Professional Report 99, 16 p., 3 sheets. https://doi.org/10.14509/2280

P 1447-B

Scott, K.M., 1989, Magnitude and frequency of lahars and lahar-runout flows in the Toutle-Cowlitz River system: U.S. Geological Survey Professional Paper 1447-B, 41 p.