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Azuma, Takashi; Ôta, Yôko; Ishikawa, Masaru; Taniguchi, Kaoru

doi:10.4116/jaqua.44.169

Cited by 10 publications

(2 citation statements)

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“…There is robust geologic evidence for uplift associated with Nankai earthquakes at Cape Muroto (Iryu et al, 2009;Maemoku, 1988Maemoku, , 2001 and the southern tip of the Kii Peninsula (Shishikura et al, 2008;Shishikura, 2013; locations 1 and 2, respectively, in Figure 1d). There is also a potential indication of uplift in southwestern Shizuoka prefecture (Azuma et al, 2005;Fujiwara, Ono, et al, 2007, Fujiwara et al, 2010 and subsidence at in Suruga Bay Fujiwara et al, 2016; locations 3 and 4 in Figure 1d), but the connection between deformation to Nankai earthquakes is more uncertain at these sites (Garrett et al, 2016). Three of the four coupling-based models reproduce the observed uplift around Cape Muroto and the Kii Peninsula, but they do not consistently reproduce the uplift in Shizuoka and subsidence in Suruga Bay.…”

Section: Resultsmentioning

confidence: 93%

Interseismic Coupling‐Based Earthquake and Tsunami Scenarios for the Nankai Trough

Baranes

Woodruff

Loveless

et al. 2018

Geophysical Research Letters

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Theoretical modeling and investigations of recent subduction zone earthquakes show that geodetic estimates of interseismic coupling and the spatial distribution of coseismic rupture are correlated. However, the utility of contemporary coupling in guiding construction of rupture scenarios has not been evaluated on the world's most hazardous faults. Here we demonstrate methods for scaling coupling to slip to create rupture models for southwestern Japan's Nankai Trough. Results show that coupling‐based models produce distributions of ground surface deformation and tsunami inundation that are similar to historical and geologic records of the largest known Nankai earthquake in CE 1707 and to an independent, quasi‐dynamic rupture model. Notably, these models and records all support focused subsidence around western Shikoku that makes the region particularly vulnerable to flooding. Results imply that contemporary coupling mirrors the slip distribution of a full‐margin, 1707‐type rupture, and Global Positioning System measurements of surface motion are connected with the trough's physical characteristics.

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Section: Resultsmentioning

confidence: 93%

Interseismic Coupling‐Based Earthquake and Tsunami Scenarios for the Nankai Trough

Baranes

Woodruff

Loveless

et al. 2018

Geophysical Research Letters

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“…1 Utsu, 1977;, 1998E 20161854M 8.4 162 40 E , , 1998 1707 1498 1 2 m Fig. 2 , , 1977; , 1984; Kitamura andKobayashi, 2014 , 1976 , 2005;Fujiwara et al, 2010 (Ando, 1975;Ishibashi, 1976;Ishibashi and Satake, 1998). Ando, 1975;, 1998 Fig.…”

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confidence: 99%

静岡県焼津平野の完新統の解析に基づく安政型地震の平均発生間隔の推定

Kitamura¹,

Mitsui²,

Takikawa³

2016

Jour. Geol. Soc. Japan

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The AD Ansei-Tokai earthquake had a magnitude of. and was caused by rupturing along mega-thrusts in the Suruga and Nankai troughs, which resulted in ~. m of uplift along the western coast of Suruga Bay. However, no other earthquake with co-seismic uplift has been documented in the region or identified from topographic features such as raised marine terraces along the western coast of the bay. To identify evidence of co-seismic uplift from geological records, we analyzed Holocene sedimentary deposits in drillcore (m long and cm in diameter) obtained from the coastal Yaizu Plain. Our results indicate that the upper surface of marine strata occurs at. m below mean sea level and yields an age of cal BP. Based on these values and the rate of subsidence during the inter-seismic period, we estimated the average recurrence interval of co-seismic uplift from Ansei-type earthquakes using two models (Models and). In Model , which assumed a constant subsidence rate, the average recurrence interval was estimated to be- ,- ,-, or-yr using mean co-seismic uplifts of. ,. ,. , or. m, respectively. In Model , which assumed an inconstant subsidence rate, the average recurrence interval was estimated to be yr using a mean co-seismic uplift of. m.

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A systematic review of geological evidence for Holocene earthquakes and tsunamis along the Nankai-Suruga Trough, Japan

Garrett

Fujiwara

Garrett

et al. 2016

Earth-Science Reviews

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTThe 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 that occurred during the historical period. This spatiotemporal compilation suggests that 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. Intervals between 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 creation and preservation of evidence at any given site as well as the genuine intervals between earthquakes. 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...

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Cited by 10 publications

References 1 publication

Interseismic Coupling‐Based Earthquake and Tsunami Scenarios for the Nankai Trough

Interseismic Coupling‐Based Earthquake and Tsunami Scenarios for the Nankai Trough

静岡県焼津平野の完新統の解析に基づく安政型地震の平均発生間隔の推定

A systematic review of geological evidence for Holocene earthquakes and tsunamis along the Nankai-Suruga Trough, Japan

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