Organic geochemical investigation of far‐field tsunami deposits of the Kahana Valley, O‘ahu, Hawai‘i

Bellanova, Piero; Frenken, Mike; Richmond, Bruce M.; Schwarzbauer, Jan; Selle, S. La; Griswold, Frances; Jaffe, Bruce E.; Nelson, Alan R.; Reicherter, Klaus

doi:10.1111/sed.12583

Cited by 16 publications

(10 citation statements)

References 31 publications

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“…Organic-geochemical compounds were extracted via solid–liquid extraction from the sediments using the overhead shaking extraction protocol after Bellanova et al 18 , 39 . Wet sediment aliquots of 10–100 g were extracted with acetone and n -hexane as solvents.…”

Section: Methodsmentioning

confidence: 99%

Tracing woody-organic tsunami deposits of the 2011 Tohoku-oki event in Misawa (Japan)

Bellanova

Frenken

Nishimura

et al. 2021

Sci Rep

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With a minimum of three reported waves, the 2011 Tohoku-oki tsunami’s destructive force caused massive damage along the northern Japanese Aomori coast. At Misawa the coastal control area was inundated up to 550 m inland and sandy sediment remnants can be traced to c. 350 m (c. 61–63% of the maximum inundation) from the shoreline. Linking the discovery of floatable plastic objects within a woody and organic layer to our analytical data lead to the detection of a yet undocumented woody-organic tsunami deposit first appearing on top of the sandy deposit but then reaching even further inland (approx. 69–72% of the max. inundation). By this observation our understanding of the documented part of the tsunami inundation may be improved. As a consequence, sand sheets of historic and paleo-tsunamis represent minimum estimates for the coastal inundation and underestimation may be reduced by addressing the woody and organic fraction of a tsunami’s inundation.

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Section: Methodsmentioning

confidence: 99%

Tracing woody-organic tsunami deposits of the 2011 Tohoku-oki event in Misawa (Japan)

Bellanova

Frenken

Nishimura

et al. 2021

Sci Rep

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“…Two recent studies indicate that organic geochemical substances have high preservation potential. Bellanova et al (2020b) investigated anthropogenic substances (polycyclic aromatic hydrocarbons, pesticides, and organochlorides) in far-field tsunami deposits in the Kahana Valley, O'ahu, Hawai'i. The detection of such compounds in or just below a historical tsunami deposit suggests the potential of this approach Tsunami deposits are not always deposited at the inundation limit; therefore, the inundation limit may be underestimated when considering only visible tsunami deposits.…”

Section: Organic and Inorganic Proxies With High Preservation Potentialmentioning

confidence: 99%

Geochemical approaches in tsunami research: current knowledge and challenges

Shinozaki

2021

Geosci. Lett.

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Over the past decade or so, geochemical techniques have been applied to the study of modern and past tsunamis. Seawater incursions and the introduction of marine organic matter can be detected through geochemical analysis, providing strong evidence that an event deposit was formed by saltwater inundation. Furthermore, the marine geochemical signature of an event may reveal the full extent of tsunami inundation far more precisely than can be obtained from sediment alone. Based mainly on literature published during the last 4 years, this paper summarizes the latest advances in and some problems with tsunami geochemical research, and specifically addresses organic and inorganic proxies with high preservation potential, geochemical characteristics of invisible tsunami deposits, handling of data from core scanners, and offshore environmental impacts. Recent studies have proposed that some organic and inorganic geochemical proxies have high preservation potential, and sometimes such evidence can be recognized from invisible tsunami deposits. Quantitative assessments of biomarkers are also effective for detecting allochthonous materials. Organic and inorganic proxies can be applied both to identify tsunami deposits and to accurately reconstruct tsunami inundation areas; however, there are as yet no universal criteria for accurate reconstruction of tsunami inundation areas by detecting invisible tsunami deposits using geochemical approaches. For deeper understanding of the behavior of geochemical characteristics derived from tsunami events, additional knowledge of the geochemical substances associated with modern and paleo-tsunami events is required. Specifically, further work is required on assessment of the environmental selectivity of geochemical proxies and refinement of core-scanner analysis for both organic and inorganic substances.

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“…An example is the work by Bellanova et al . () which used organic geochemistry (anthropogenic tracers and biomarkers) to examine the potential of anthropogenic organic geochemical markers to characterize tsunami deposits. The influence of anthropogenic markers within individual cores varied widely with various sediment layers being enriched or depleted in polycyclic aromatic hydrocarbons (PAHs), pesticides and other chemical compounds (Bellanova et al ., ).…”

Section: Recent Developmentsmentioning

confidence: 99%

“…() which used organic geochemistry (anthropogenic tracers and biomarkers) to examine the potential of anthropogenic organic geochemical markers to characterize tsunami deposits. The influence of anthropogenic markers within individual cores varied widely with various sediment layers being enriched or depleted in polycyclic aromatic hydrocarbons (PAHs), pesticides and other chemical compounds (Bellanova et al ., ). These significant changes in concentrations of individual anthropogenic geochemical compounds in or just below tsunami deposits confirmed the potential of this novel methodological approach to identify tsunami imprints.…”

Section: Recent Developmentsmentioning

confidence: 99%

Tsunami deposits: Present knowledge and future challenges

Costa

Andrade

2020

Sedimentology

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Tsunami deposits are the primary source of information on (past) large tsunami events and thereby are crucial for accurate hazard assessments. Tsunami deposits studies have developed over the last three decades, but this is still a young geoscience discipline. Following the 5th International Tsunami Field Symposium in 2017 an opportunity arose to publish a Special Issue focusing on present knowledge and future research challenges. This paper aims to briefly review current state‐of‐the‐art research, summarizing major findings and gathering relevant works that describe the progress achieved over the last three decades. In this paper the relevance of tsunami deposits, their peculiar sedimentary characteristics and their differentiation from other high energy events are presented. Especially over the last decade an incredibly high number of studies have been published on tsunami deposits, many of which are of a high quality and provide detailed literature reviews. Some of these studies represent the current progress discussed here. Challenges are also introduced, to spur a discussion on future scientific questions that can and should be addressed by tsunami geoscientists. Coupling onshore–offshore records is an area where tsunami geoscience faces some of its major challenges. Moreover, the application of non‐destructive high‐resolution techniques to study the internal structure and composition of tsunami deposits can also provide an opportunity to further examine deposits, and from this derive physical parameters of the forcing mechanism. Another topic is better understanding of the erosional signature of tsunami events and a continuation of the effort to better incorporate age‐estimation methods by developing more accurate dating methodology. Finally, there is also the need for the improvement of empirical, forward and regressive numerical models to better contribute to the characterization of tsunami events.

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Organic geochemical investigation of far‐field tsunami deposits of the Kahana Valley, O‘ahu, Hawai‘i

Cited by 16 publications

References 31 publications

Tracing woody-organic tsunami deposits of the 2011 Tohoku-oki event in Misawa (Japan)

Tracing woody-organic tsunami deposits of the 2011 Tohoku-oki event in Misawa (Japan)

Geochemical approaches in tsunami research: current knowledge and challenges

Tsunami deposits: Present knowledge and future challenges

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