Distal Run-up Records of Latest Holocene Paleotsunami Inundation
Paleotsunami records in two localities of the central Cascadia margin, Neskowin and Beaver (West Coast, U.S.A., Northeast Pacific Ocean coast), are extended landward to distal flood plain settings. Three paleotsunami sand sheets are correlated to Cascadia subduction zone earthquakes, between 0.3 and...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1070.7339 2023-05-15T15:41:07+02:00 Distal Run-up Records of Latest Holocene Paleotsunami Inundation Curt D Peterson Kenneth M Cruikshank Robert B Schlichting Scott Braunsten The Pennsylvania State University CiteSeerX Archives 2010 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1070.7339 http://cascadiageo.org/documentation/literature/cascadia_papers/peterson_etal_2010_run_up_records_neskowin_beaver_creek.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1070.7339 http://cascadiageo.org/documentation/literature/cascadia_papers/peterson_etal_2010_run_up_records_neskowin_beaver_creek.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://cascadiageo.org/documentation/literature/cascadia_papers/peterson_etal_2010_run_up_records_neskowin_beaver_creek.pdf text 2010 ftciteseerx 2020-04-26T00:21:22Z Paleotsunami records in two localities of the central Cascadia margin, Neskowin and Beaver (West Coast, U.S.A., Northeast Pacific Ocean coast), are extended landward to distal flood plain settings. Three paleotsunami sand sheets are correlated to Cascadia subduction zone earthquakes, between 0.3 and ϳ1.3 ka in age. One older paleotsunami layer (2960-3220 cal YBP) is apparent in some deeper core sites from the Beaver Creek locality. Marine sand (22%-100%) and marine diatoms (40%-100%) from the distal sand sheets distinguish the catastrophic marine inundations from creek floods. The greatest inundations are correlated to two Cascadia paleotsunami events, #3 at ϳ1.3 ka and an older event between ϳ2.6 and ϳ3.2 ka, based on radiocarbon dating and great earthquake sequence. The bestpreserved records are from paleotsunami #3, which reached 4.1 km in overland inundation up the North Beaver flood plain (3 m elevation North American Vertical Datum). At the Neskowin locality, a sand sheet from the #3 paleotsunami was traced to 8.3 m elevation in the Hawk flood plain. Adjusting for paleosea level at 1.3 ka, we estimate that the #3 paleotsunami run-up height reached 9 m at a landward distance of 1.0 km in Neskowin. The paleotsunami sand sheets in Neskowin and Beaver represent the maximum recorded distal run-up for Cascadia paleotsunami reported to date. The potential for preservation of marine surge deposits in alluvial flood plains should greatly extend the geologic record of prehistoric inundations in other susceptible coastlines. Text Beaver Creek Unknown Pacific |
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English |
description |
Paleotsunami records in two localities of the central Cascadia margin, Neskowin and Beaver (West Coast, U.S.A., Northeast Pacific Ocean coast), are extended landward to distal flood plain settings. Three paleotsunami sand sheets are correlated to Cascadia subduction zone earthquakes, between 0.3 and ϳ1.3 ka in age. One older paleotsunami layer (2960-3220 cal YBP) is apparent in some deeper core sites from the Beaver Creek locality. Marine sand (22%-100%) and marine diatoms (40%-100%) from the distal sand sheets distinguish the catastrophic marine inundations from creek floods. The greatest inundations are correlated to two Cascadia paleotsunami events, #3 at ϳ1.3 ka and an older event between ϳ2.6 and ϳ3.2 ka, based on radiocarbon dating and great earthquake sequence. The bestpreserved records are from paleotsunami #3, which reached 4.1 km in overland inundation up the North Beaver flood plain (3 m elevation North American Vertical Datum). At the Neskowin locality, a sand sheet from the #3 paleotsunami was traced to 8.3 m elevation in the Hawk flood plain. Adjusting for paleosea level at 1.3 ka, we estimate that the #3 paleotsunami run-up height reached 9 m at a landward distance of 1.0 km in Neskowin. The paleotsunami sand sheets in Neskowin and Beaver represent the maximum recorded distal run-up for Cascadia paleotsunami reported to date. The potential for preservation of marine surge deposits in alluvial flood plains should greatly extend the geologic record of prehistoric inundations in other susceptible coastlines. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Curt D Peterson Kenneth M Cruikshank Robert B Schlichting Scott Braunsten |
spellingShingle |
Curt D Peterson Kenneth M Cruikshank Robert B Schlichting Scott Braunsten Distal Run-up Records of Latest Holocene Paleotsunami Inundation |
author_facet |
Curt D Peterson Kenneth M Cruikshank Robert B Schlichting Scott Braunsten |
author_sort |
Curt D Peterson |
title |
Distal Run-up Records of Latest Holocene Paleotsunami Inundation |
title_short |
Distal Run-up Records of Latest Holocene Paleotsunami Inundation |
title_full |
Distal Run-up Records of Latest Holocene Paleotsunami Inundation |
title_fullStr |
Distal Run-up Records of Latest Holocene Paleotsunami Inundation |
title_full_unstemmed |
Distal Run-up Records of Latest Holocene Paleotsunami Inundation |
title_sort |
distal run-up records of latest holocene paleotsunami inundation |
publishDate |
2010 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1070.7339 http://cascadiageo.org/documentation/literature/cascadia_papers/peterson_etal_2010_run_up_records_neskowin_beaver_creek.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Beaver Creek |
genre_facet |
Beaver Creek |
op_source |
http://cascadiageo.org/documentation/literature/cascadia_papers/peterson_etal_2010_run_up_records_neskowin_beaver_creek.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1070.7339 http://cascadiageo.org/documentation/literature/cascadia_papers/peterson_etal_2010_run_up_records_neskowin_beaver_creek.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766373983970656256 |