Holocene environmental changes and paleo-tsunami history in Onuma on the southern part of the Sanriku Coast, northeast Japan

Ishimura, Daisuke; Miyauchi, Takashi

doi:10.1016/j.margeo.2017.01.011

Cited by 20 publications

(2 citation statements)

References 39 publications

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“…Research of tsunami deposits has been intensively conducted on and off the Pacific coast in the Tohoku region since the 2011 Tohoku‐oki earthquake (Goto et al ., ; Ishimura and Miyauchi, ; Ikehara et al ., ; Takada et al ., ; Inoue et al ., ; Usami et al ., ), however, in correlating tsunami deposits between terrestrial and marine sediments, the reservoir effect is a critical uncertainty. Therefore, To‐Cu may provide a robust isochronous surface and age marker.…”

Section: Discussionmentioning

confidence: 99%

Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

Ishimura

Hiramine

2019

J Quaternary Science

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A tephra layer offers an isochronous surface in sediments, thus serving as a key bed and/or an age marker. Recent high-resolution sediment research (e.g. varved sediments) has revealed optically invisible tephra fingerprints and provided high-precision tephra ages. However, a tephra-based correlation cannot succeed without detailed knowledge of the tephra characteristics in a proximal area to correlate with tephra in high-resolution sediments in remote areas. Here we documented the detailed characteristics of Towada-Chuseri (To-Cu) tephra, which is associated with the Middle Holocene volcanic explosivity index 5 eruption of Towada volcano, northeast Japan. We used To-Cu tephra samples to achieve the proximal-distal correlation of three members: Chuseri pumice (Cu), Kanegasawa pumice (Kn) and Utarube ash (Ut). These distal occurrences correlate with proximal To-Cu tephra based on volcanic glass morphology and refractive index, as well as on major element composition of volcanic glass shards. Refractive indices allow the preliminary correlation of each member, and major element composition helps in distinguishing Ut from the other members. Glass morphology provides additional support. These correlations reveal that To-Cu, especially Cu, covered central to northeast Japan while confirming that To-Cu is the representative tephra in the Middle Holocene of the Tohoku region.

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Section: Discussionmentioning

confidence: 99%

Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

Ishimura

Hiramine

2019

J Quaternary Science

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“…Considering the existence of Pleistocene marine terraces in the same area, we need to consider that the long-term vertical movement in the middle-south Sanriku coast can be variable in time. Independently, Ishimura & Miyauchi (2017) studied long-term environmental changes at Onuma on the southern Sanriku coast ∼30 km north of Ayukawa. After a correction for global sea-level changes, they estimated a subsidence rate during the Holocene as 0.4-1.0 mm/year.…”

Section: Vertical Motion Of the Pacific Coastmentioning

confidence: 99%

Geodetic and Geological Deformation of the Island Arc in Northeast Japan Revealed by the 2011 Tohoku Earthquake

Sagiya

Meneses-Gutierrez

2022

Annu. Rev. Earth Planet. Sci.

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Northeast Japan is a typical island arc related to the Pacific plate subduction. The 2011 Mw 9.0 Tohoku-oki earthquake provided a unique opportunity to analyze crustal deformation with different boundary conditions, similar to a gigantic rock deformation experiment. We review findings obtained through various observations and data analyses in Northeast Japan, focusing on the crustal deformation in different timescales. The occurrence of the M9 earthquake solved the ongoing paradox that the geodetic strain rate is an order of magnitude larger than the geologic estimate, showing that the centennial geodetic observation had mainly captured the elastic strain accumulation. Along the localized contraction zone along the Japan Sea coast, a comparison of postseismic and interseismic deformation patterns revealed a significant contribution of inelastic deformation, which plays an essential role in long-term deformation. Along the Pacific coast, rapid interseismic subsidence and unexpected coseismic subsidence were followed by a rapid postseismic uplift, indicating that viscous relaxation in the mantle is of essential importance. These findings advance our understanding of plate interactions and the tectonic evolution of the island arc. ▪ The 2011 Tohoku-oki earthquake provided the most complete crustal deformation data set ever for interseismic, coseismic, and postseismic periods. ▪ The discrepancy between the geologic and geodetic deformation rates in Northeast Japan is attributed to an elastic strain due to interplate locking. ▪ A significant contribution of inelastic deformation in the island arc crust is identified through a comparison of interseismic and postseismic deformations. Expected final online publication date for the Annual Review of Earth and Planetary Sciences, Volume 50 is May 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Subduction zone paleoseismology along the Pacific coast of northeast Japan — progress and remaining problems

Sawai

2020

Earth-Science Reviews

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Holocene environmental changes and paleo-tsunami history in Onuma on the southern part of the Sanriku Coast, northeast Japan

Cited by 20 publications

References 39 publications

Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

Geodetic and Geological Deformation of the Island Arc in Northeast Japan Revealed by the 2011 Tohoku Earthquake

Subduction zone paleoseismology along the Pacific coast of northeast Japan — progress and remaining problems

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