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Geological evidence for historical and older earthquakes and tsunamis along the Nankai Trough, Japan
Garrett, Ed; De Batist, Marc; Heyvaert, Vanessa et al.
2015In EGU General Assembly Conference Abstracts
 

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Abstract :
[en] In the wake of the devastating 2011 Tōhoku earthquake and tsunami, the Central Disaster Management Council of the Japanese Cabinet Office issued new guidance for assessing seismic hazards in Japan. Before 2011, seismic hazard assessment relied on source models developed from knowledge of a small number of well-documented historical earthquakes. Less well-known historical earthquakes, including the AD 869 Jōgan Sanriku earthquake, were largely disregarded as their seismic intensities or tsunami heights could not be reconciled with the chosen seismic sources. Following the unexpectedly large size of the Tōhoku earthquake, the Cabinet Office advocated renewed investigation of earthquake and tsunami occurrence over historical and longer timescales, with a particular focus on defining the largest possible magnitudes. The new guidelines pay close attention to the Nankai Trough, the subduction zone where the Philippine Sea Plate dives beneath the Eurasian Plate. The Nankai Trough faces the densely populated and highly industrialised coastline of south central Japan and harbours a widely-known seismic gap along its eastern Tōkai segment. A full-length rupture of the Nankai Trough, including the Tōkai segment, could produce an earthquake with a magnitude approaching that of the 2011 event, with tsunami travel times to the closest shorelines of less than 30 minutes. We review geological evidence for historical and older earthquakes and tsunamis along the Nankai Trough. This evidence comes from a wide variety of sources, including uplifted marine terraces, subsided marshes, liquefaction features, turbidites and tsunami deposits in coastal lakes and lowlands. Examining papers published before and after 2011, we investigate the impact of the new Cabinet Office guidelines on attempts to understand the magnitude and recurrence of these events. Additionally, we introduce the Belgian Science Policy Office funded QuakeRecNankai project, a collaboration aiming to supplement existing records by generating a long time series of earthquake and tsunami recurrence from sites at the eastern end of the Nankai Trough. The project uses a diverse range of geophysical, sedimentological, geochemical and microfossil approaches to investigate records of Holocene paleotsunamis in and around Lake Hamana and records of seismic shaking from the Fuji Five Lakes.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Garrett, Ed
De Batist, Marc
Heyvaert, Vanessa
Hubert, Aurelia  ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire
Fujiware, Osamu
Yokoyama, Yusuke
Brückner, Helmut
Garrett, Philip
Language :
English
Title :
Geological evidence for historical and older earthquakes and tsunamis along the Nankai Trough, Japan
Publication date :
April 2015
Event name :
EGU General Assembly Conference
Event place :
Vienne, Austria
Event date :
avril 2015
Audience :
International
Main work title :
EGU General Assembly Conference Abstracts
Name of the research project :
QuakeRecNankai
Funders :
BELSPO - Service Public Fédéral de Programmation Politique scientifique
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