Real-time observations of the February 2010 Chile and March 2011 Japan tsunamis recorded in Honolulu by the Pacific Islands Ocean Observing System

TitleReal-time observations of the February 2010 Chile and March 2011 Japan tsunamis recorded in Honolulu by the Pacific Islands Ocean Observing System
Publication TypeJournal Article
Year of Publication2014
AuthorsFiedler J.W, McManus MA, Tomlinson M.S, De Carlo E.H, Pawlak G.R, Steward G.F, Nigro O.D, Timmerman R.E, Drupp P.S, Ostrander C.E
JournalOceanography
Volume27
Pagination186-200
Date Published2014/06
Type of ArticleArticle
ISBN Number1042-8275
Accession NumberWOS:000338758400024
Keywordscoastal water-quality; hawaii; impacts; India; oahu; oysters; recovery; streams; variability
Abstract

Continuous monitoring by the Pacific Islands Ocean Observing System (PacIOOS) provided a unique opportunity to study the effects of two tsunamis on the coastal and estuarine waters of Hawaii. By the time the 2010 Chile and 2011 Japan tsunamis reached the waters of southern O'ahu, they had lost much of their power (both were < 1 m high in Honolulu Harbor). Nevertheless, their effects on the surrounding waters were profound, with increases observed in near-bed current velocities, mixing in estuarine waters, salinity, turbidity, chlorophyll, and pathogenic bacteria such as Vibrio spp. In addition to these increases, we observed small decreases in nitrate and dissolved oxygen concentrations offshore, including a dampening of the normal diel cycle in dissolved oxygen. Some of the effects penetrated canals as far as 1 kin inshore and could be observed up to 0.5 km offshore. Data from the PacIOOS sensors and our sampling show that altered and potentially degraded water quality can persist longer than the physical threat from surge. Shortly after both tsunamis, the "all clear" signal was given and people resumed recreational activities in coastal waters before our data indicated recovery of healthy water quality conditions. Following such events, monitoring should be expanded and continued in order to accurately characterize water quality and evaluate potential public health risks.

Short TitleOceanography
Student Publication: 
Yes
Student: 
sharknado