Article (Scientific journals)
A systematic review of geological evidence for Holocene earthquakes and tsunamis along the Nankai-Suruga Trough, Japan
Garrett, Ed; Fujiwara, Osamu; Garrett, Philip et al.
2016In Earth-Science Reviews
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Keywords :
Paleoseismology; paleotsunami
Abstract :
[en] The Nankai-Suruga Trough, the subduction zone that lies immediately south of Japan’s densely populated southern coastline, generates devastating great earthquakes (magnitude > 8) characterised by intense shaking, crustal deformation and tsunami generation. Forecasting the hazards associated with future earthquakes along this >700 km long fault requires a comprehensive understanding of past fault behaviour. While the region benefits from a long and detailed historical record, palaeoseismology has the potential to provide a longer-term perspective and additional crucial insights. In this paper, we summarise the current state of knowledge regarding geological evidence for past earthquakes and tsunamis along the Nankai-Suruga Trough. Incorporating literature originally published in both Japanese and English and enhancing available results with new age modelling approaches, we summarise and critically evaluate evidence from a wide variety of sources. Palaeoseismic evidence includes uplifted marine terraces and biota, marine and lacustrine turbidites, liquefaction features, subsided marshes and tsunami deposits in coastal lakes and lowlands. While 75 publications describe proposed evidence from more than 70 sites, only a limited number provide compelling, well-dated evidence. The best available records enable us to map the most likely rupture zones of twelve earthquakes occurring during the historical period. This spatiotemporal compilation suggests the AD 1707 earthquake ruptured almost the full length of the subduction zone and that earthquakes in AD 1361 and 684 may have been predecessors of similar magnitude. Intervening earthquakes were of lesser magnitude, highlighting the variability in rupture mode that characterises the Nankai-Suruga Trough. Recurrence intervals for ruptures of the same seismic segment range from less than 100 to more than 450 years during the historical period. Over longer timescales, palaeoseismic evidence suggests intervals between earthquakes ranging from 100 to 700 years, however these figures reflect a range of thresholds controlling the of creation and preservation of evidence at any given site as well as genuine earthquake recurrence intervals. At present, there is no geological data that suggest the occurrence of a larger magnitude earthquake than that experienced in AD 1707, however few studies have sought to establish the relative magnitudes of different earthquake and tsunami events along the Nankai-Suruga Trough. Alongside the lack of research designed to quantify the maximum magnitude of past earthquakes, we emphasise issues over alternative hypotheses for proposed palaeoseismic evidence, the paucity of robust chronological frameworks and insufficient appreciation of changing thresholds of evidence creation and preservation over time as key issues that must be addressed by future research.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Garrett, Ed
Fujiwara, Osamu
Garrett, Philip
Heyvaert, Vanessa
Shishikura, Masanobu
Yokoyama, Yusuke
Hubert, Aurelia  ;  Université de Liège > Département de géographie > Géomorphologie et Géologie du Quaternaire
Brückner, Helmut
Nakamura, Atsunori
De Batiste, Marc
Language :
English
Title :
A systematic review of geological evidence for Holocene earthquakes and tsunamis along the Nankai-Suruga Trough, Japan
Publication date :
2016
Journal title :
Earth-Science Reviews
ISSN :
0012-8252
eISSN :
1872-6828
Publisher :
Elsevier Science
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
QuakeRecNankai project
Funders :
Belgian Science Policy Office (BELSPO BRAIN-be BR/121/A2).
Available on ORBi :
since 21 June 2016

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