Daisuke Ishimura
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View article: Landscape Signature of Seismogenic Faults in the Off and Onshore Domains of the Noto Peninsula in Japan's Back‐Arc
Landscape Signature of Seismogenic Faults in the Off and Onshore Domains of the Noto Peninsula in Japan's Back‐Arc Open
The eastern margin of the Sea of Japan is a zone of great seismic and tsunami hazard due to multiple offshore and nearshore reverse faults as shown by the 2024 7.5 Noto Peninsula Earthquake. Here we compare coseismic deformation of the 202…
View article: Novel mapping approach for coastal boulders using deep learning
Novel mapping approach for coastal boulders using deep learning Open
Coastal boulders are often formed by tsunamis and storm surges and thus provide valuable insights into the dynamics of past inundation events. However, the mapping of these boulders has been constrained by inherent limitations in the speed…
View article: Shape evolution of bulk sediment in headwater streams: effects of rock type and particle size
Shape evolution of bulk sediment in headwater streams: effects of rock type and particle size Open
Given the importance of sediments in fluvial morphodynamics, studying how sediment particle shapes change during mass loss is important for understanding the morphology and change rates of fluvial landscapes. Particles of riverbed material…
View article: Landscape signature of seismogenic faults in the off- and onshore domains of the Noto Peninsula in Japan’s back-arc
Landscape signature of seismogenic faults in the off- and onshore domains of the Noto Peninsula in Japan’s back-arc Open
The eastern margin of the Sea of Japan is a zone of great seismic and tsunami hazard due to multiple offshore and nearshore reverse faults as shown by the 2024 Mw 7.5 Noto Peninsula Earthquake. Here we compare coseismic deformation of the …
View article: Three-stage evolution of particle shape in headwater streams
Three-stage evolution of particle shape in headwater streams Open
Given the importance of sediments in fluvial morphodynamics, studying how sediment particle shapes change during mass loss is important for understanding the morphology and change rates of fluvial landscapes. Particles of riverbed material…
View article: Active faults and coastal landscapes in the back arc of Central Japan, lessons from the Mw 7.5 Noto Peninsula earthquake
Active faults and coastal landscapes in the back arc of Central Japan, lessons from the Mw 7.5 Noto Peninsula earthquake Open
On January 1st, 2024, the Mw 7.5 Noto Peninsula earthquake ruptured on a series of coastal offshore reverse faults in the back arc of central Japan. Closest to the rupture, in the northwest, the coastal rocks uplifted as much as 4.4 m (Fuk…
View article: Petrographical evidence of the >1000 km voyage of a white pumice raft that arrived at the Ogasawara and Nansei Islands after the October 2023 earthquakes in the southern Izu Islands
Petrographical evidence of the >1000 km voyage of a white pumice raft that arrived at the Ogasawara and Nansei Islands after the October 2023 earthquakes in the southern Izu Islands Open
An earthquake swarm occurred at Sofu Seamount near Izu-Torishima in the Izu-Ogasawara (Bonin) Arc, Japan, on 8 October 2023, followed by the arrival of unexpectedly-large tsunamis over a wide area of the Pacific coast of southwest Japan. O…
View article: Dispersion, fragmentation, abrasion, and organism attachment of drift pumice from the 2021 Fukutoku-Oka-no-Ba eruption in Japan
Dispersion, fragmentation, abrasion, and organism attachment of drift pumice from the 2021 Fukutoku-Oka-no-Ba eruption in Japan Open
In August 13, 2021, the submarine volcano Fukutoku-Oka-no-Ba (FOB) erupted and produced massive drift pumice in the western Pacific Ocean off Japan for the first time in ~ 35 years. Although drift pumice plays a crucial role in the dispers…
View article: Pumice Drifting from Ioto Volcano in the Izu–Bonin Arc to the Nansei Islands, Japan
Pumice Drifting from Ioto Volcano in the Izu–Bonin Arc to the Nansei Islands, Japan Open
Pumice is a pyroclastic material of low density and is occasionally buoyant in water. When it erupts from submarine volcanoes, it can drift long distances and wash ashore at remote beaches. Pumice from the eruption of Fukutoku‐Oka‐no‐Ba vo…
View article: Landscape changes caused by the 2024 Noto Peninsula earthquake in Japan
Landscape changes caused by the 2024 Noto Peninsula earthquake in Japan Open
Landscapes are shaped by tectonic, climatic, and surface processes over geological timescales, but we rarely witness the events of marked landscape change. The moment magnitude 7.5 Noto Peninsula earthquake in central Japan was caused by a…
View article: Cryptotephra preserved in Lake Suigetsu (SG14 core) reveals the eruption timing and distribution of ash fall from Japanese volcanoes during the Late-glacial to early Holocene
Cryptotephra preserved in Lake Suigetsu (SG14 core) reveals the eruption timing and distribution of ash fall from Japanese volcanoes during the Late-glacial to early Holocene Open
Long sedimentary successions extracted for palaeoclimate research regularly preserve volcanic ash (tephra) fall from explosive eruptions and are increasingly used to elucidate the timing and scale of past events. This study investigates th…
View article: Holocene drift pumices and their source volcanoes at Sekinehama, Mutsu City, Aomori Prefecture, Japan
Holocene drift pumices and their source volcanoes at Sekinehama, Mutsu City, Aomori Prefecture, Japan Open
青森県むつ市関根浜に露出する完新世堆積物から多数の軽石(SKN-1~6)を見出した.このうち2層の軽石濃集層(SKN-2とSKN-3)は,それぞれ鬱陵島U-2テフラ(U-2)と十和田中掫テフラ(To-Cu)の軽石で構成されていた.SKN-2とSKN-3は層相と層序,軽石の粒径・形状から,海域での漂流を経て堆積した漂着軽石と考えられる.また,SKN-2とSKN-3は,有機質シルト・泥炭層中に存在することと約6 kaの海水準や地形を考慮すると,海と繋がる小河川を経て潟湖に漂着し…
View article: Numerical estimation of a tsunami source at the flexural area of Kuril and Japan Trenches in the fifteenth to seventeenth century based on paleotsunami deposit distributions in northern Japan
Numerical estimation of a tsunami source at the flexural area of Kuril and Japan Trenches in the fifteenth to seventeenth century based on paleotsunami deposit distributions in northern Japan Open
Paleotsunami deposit investigations and numerical tsunami computations have been performed to elucidate the source and size of large tsunamis along the Kuril to Japan Trenches, particularly for unusual tsunamis that occurred in the sevente…
View article: Paleoseismic events and shallow subsurface structure of the central part of the Futagawa fault, which generated the 2016 Mw 7.0 Kumamoto earthquake
Paleoseismic events and shallow subsurface structure of the central part of the Futagawa fault, which generated the 2016 Mw 7.0 Kumamoto earthquake Open
The mainshock (Mw 7.0) of the 16 April 2016 Kumamoto earthquake sequence caused a ~30-km-long surface rupture along the Futagawa fault and the northern Hinagu fault in central Kyushu, Japan. A large number of distributed secondary surface …
View article: Characteristics of secondary-ruptured faults in the Aso Caldera triggered by the 2016 Mw 7.0 Kumamoto earthquake
Characteristics of secondary-ruptured faults in the Aso Caldera triggered by the 2016 Mw 7.0 Kumamoto earthquake Open
The 16 April 2016 Mw 7.0 Kumamoto earthquake caused prominent fault displacements and crustal deformation, not only around the main rupture faults but also around numerous secondary-ruptured faults. The physics and characteristics of such …
View article: Characteristics of Secondary-Ruptured Faults in The Aso Caldera Triggered by The 2016 Mw 7.0 Kumamoto Earthquake
Characteristics of Secondary-Ruptured Faults in The Aso Caldera Triggered by The 2016 Mw 7.0 Kumamoto Earthquake Open
The 16 April 2016 Mw 7.0 Kumamoto earthquake caused prominent fault displacements and crustal deformation, not only around the main rupture faults but also around numerous secondary-ruptured faults. The physics and characteristics of such …
View article: Paleo-tsunami deposit research on the Sanriku Coast since the 2011 Tohoku-oki earthquake
Paleo-tsunami deposit research on the Sanriku Coast since the 2011 Tohoku-oki earthquake Open
2011年東北地方太平洋沖地震以前は，三陸海岸の長期間にわたる津波履歴は十分に理解されていなかった．2011年以降，従来は古津波堆積物調査に適した地域ではないと考えられてきた三陸海岸において，2011年津波の記録や徹底した掘削調査により，古津波堆積物の数や分布が明らかにされてきた．特に歴史記録にある1611年慶長三陸津波や869年貞観津波によると考えられるイベント堆積物は三陸海岸の広い範囲で認められ，その被害の様子が捉えられてきた．加えて，より古い数千年間のイベント堆積物が…