Landward fining in onshore gravel as evidence for a late Pleistocene tsunami on Molokai, Hawaii

Research Article| March 01, 2000 Landward fining in onshore gravel as evidence for a late Pleistocene tsunami on Molokai, Hawaii Andrew L. Moore Andrew L. Moore 1Disaster Control Research Center, School of Engineering, Tohoku University, Aoba 06, Sendai 980-8579, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Andrew L. Moore 1Disaster Control Research Center, School of Engineering, Tohoku University, Aoba 06, Sendai 980-8579, Japan Publisher: Geological Society of America Received: 20 Jul 1999 Revision Received: 06 Dec 1999 Accepted: 07 Dec 1999 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2000) 28 (3): 247–250. https://doi.org/10.1130/0091-7613(2000)28<247:LFIOGA>2.0.CO;2 Article history Received: 20 Jul 1999 Revision Received: 06 Dec 1999 Accepted: 07 Dec 1999 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Andrew L. Moore; Landward fining in onshore gravel as evidence for a late Pleistocene tsunami on Molokai, Hawaii. Geology 2000;; 28 (3): 247–250. doi: https://doi.org/10.1130/0091-7613(2000)28<247:LFIOGA>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract A conglomerate on the south coast of Molokai, Hawaii, has simple trends in carbonate-clast abundance and size that are explained better by tsunami deposition than by shoreline uplift. The conglomerate extends as much as 2 km inland, and to 72 m above present sea level. It consists mainly of basalt boulders derived from underlying bedrock but also contains carbonate pebbles and cobbles derived from coral reefs. Whereas basalt clasts display no vertical or lateral trend in size, carbonate clasts decrease in abundance and get smaller with elevation and distance from shore. The origin of the conglomerate is controversial; it may have been produced by either a single tsunami, or by wave action at multiple higher sea levels on Molokai. The deposit is best explained as the result of a single tsunami because only such a tsunami could move large grains so far inland and produce a simple trend in carbonate clasts while imparting no trend to the basalt clasts. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.