High resolution geochemical and grain-size analysis of the AD 1755 tsunami deposit: Insights into the inland extent and inundation phases

Moreira, Silvana; Costa, Pedro; Andrade, César; Lira, Cristina; Freitas, Maria da Conceição; Oliveira, M. A. Leigui de; Reichart, Gert‐Jan

doi:10.1016/j.margeo.2017.04.007

Cited by 40 publications

(32 citation statements)

References 61 publications

(84 reference statements)

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“…Inorganic geochemical proxies also have been studied in historical and prehistoric tsunami deposits (Judd et al 2017;Moreira et al 2017;Chagué et al 2018Chagué et al , 2020Avşar 2019;Watanabe et al 2020). Judd et al (2017) and Chagué et al (2018) characterized recent (within 100 years) tsunami deposits by geochemical proxies.…”

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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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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“…() and Moreira et al . () are based on different sedimentological features (i.e. microtextures, micropalaeontology, heavy minerals and geochemistry) to identify tsunami inundation and backwash phases.…”

Section: Recent Developmentsmentioning

confidence: 99%

“…Tsunami depositional studies have been widely applied aiming to decipher their original sediment sources and the pathway tracked by the tsunami inundation pulse waves (e.g. Gelfenbaum & Jaffe, 2003;Paris et al, 2009;Costa et al, 2012a;Cuven et al, 2013;Pilarczyk et al, 2014;Moreira et al, 2017). Tsunami deposits have been described as essentially sourced in coastal sedimentslandward of the boundary defined by the seasonal depth of closure of the beach (and coastal) profile (e.g.…”

Section: Establishment Of Source Sediment and Transport Pathsmentioning

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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“…Moreover, Sawai (2012) reported that inverse grading can be interpreted as grain coarsening because of suspended sediment passage with ow acceleration. Furthermore, Moreira et al (2017) report inverse or massive sedimentary sequences in the basal section of AD 1755 tsunami deposits. They attributed these sequences to the dominance of bedload-dominated transport and deposition regarded high ow velocities and high-density sediment loads during the tsunami inundation (e.g., Jaffe et al 2012).…”

Section: Eventmentioning

confidence: 99%

Three thousand year paleo-tsunami history of the southern part of the Japan Trench

Higaki

Goto

Yanagisawa

et al. 2020

Preprint

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This study conducted a field survey and multiproxy analyses on sediment cores retrieved from the Kobatake-ike pond in Choshi City, Chiba prefecture, Japan. Kobatake-ike pond is located at a high elevation (i.e., 11 m above present-day sea level) and faces the southern part of the Japan Trench. Three sedimentological events were detected within the continuous mud and peat sequences of three thousand years. Based on the multi-proxy analyses, including mineralogical composition, diatom assemblages, and geochemical markers, these sedimentological events were associated with past tsunamis. The most recent event was a sandy layer from the AD 1677 Enpo tsunami, reported by an earlier study conducted in the pond. The estimated recurrence interval for tsunamis was approximately 700 years, comparable to that of the central part of the Japan Trench. The timing of at least two of three sedimentological events seems to have been close (i.e., intervals of few tens of years) before or after the occurrence of large earthquakes and tsunamis along the central part of the Japan Trench. This implies a possible spatiotemporal relation of earthquake generations between the central and southern parts of the Japan Trench, which can be associated with drastic changes in stress fields in the neighborhood of the rupture area. The risk of future large earthquakes and tsunamis along the southern part of the Japan Trench seems exceptionally high, considering the stress change caused by Tohoku-oki earthquake with 9.0 Mw in 2011. This study necessitates the need to investigate the spatiotemporal relationship of large earthquakes from the perspectives of geology, seismology, and history.

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High resolution geochemical and grain-size analysis of the AD 1755 tsunami deposit: Insights into the inland extent and inundation phases

Cited by 40 publications

References 61 publications

Geochemical approaches in tsunami research: current knowledge and challenges

Geochemical approaches in tsunami research: current knowledge and challenges

Tsunami deposits: Present knowledge and future challenges

Three thousand year paleo-tsunami history of the southern part of the Japan Trench

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