Shinji Toda
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View article: Breaking the Cycle: Short Recurrence and Overshoot of an M9-class Kamchatka Earthquake
Breaking the Cycle: Short Recurrence and Overshoot of an M9-class Kamchatka Earthquake Open
M9-class megathrust earthquakes in subduction zones are generally thought to release slip deficits on the plate interface accumulated over centuries. However, the 2025 Kamchatka earthquake (Mw 8.8-8.9) ruptured nearly the same area as the …
View article: Breaking the Cycle: Short Recurrence and Overshoot of an M9-class Kamchatka Earthquake
Breaking the Cycle: Short Recurrence and Overshoot of an M9-class Kamchatka Earthquake Open
M9-class megathrust earthquakes in subduction zones are generally thought to release slip deficits on the plate interface accumulated over centuries. However, the 2025 Kamchatka earthquake (Mw 8.8--8.9) ruptured nearly the same area as the…
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: Preface of the Special Issue “Environmental Change and Mega Disasters Unraveled from Terrestrial Archives: Toward Disaster Prevention and Mitigation”
Preface of the Special Issue “Environmental Change and Mega Disasters Unraveled from Terrestrial Archives: Toward Disaster Prevention and Mitigation” Open
Large-scale natural phenomena are generally infrequent; however, their imprints can still be traced through geological records of past events. Terrestrial archives are one of the sources for the records of past events. Although they have a…
View article: Transient Response and Adjustment Timescales of Channel Width and Angle of Valley‐Side Slopes to Accelerated Incision
Transient Response and Adjustment Timescales of Channel Width and Angle of Valley‐Side Slopes to Accelerated Incision Open
Studying bedrock rivers during their transient states helps understand the response of a fluvial system to the changing boundary conditions. Although theoretical studies predict how river form adjusts to changes in incision or rock uplift …
View article: Linking surface deformation with lower crustal shear zones: insights into drivers of millennial-scale earthquake clustering and time-dependent seismic hazard
Linking surface deformation with lower crustal shear zones: insights into drivers of millennial-scale earthquake clustering and time-dependent seismic hazard Open
Surface faulting earthquakes are known to cluster in time from historical and palaeoseismic studies in multiple active tectonic settings, including central Greece, southern California and central Italy. However, the mechanism(s) responsibl…
View article: LATE QUATERNARY ACTIVITY OF THE HARAMACHI SEGMENT OF THE FUTABA FAULT IN NORTHEAST JAPAN THROUGH TOPOGRAPHIC ANAGLYPH IMAGES AND BOREHOLE CORE SEDIMENT ANALYSIS
LATE QUATERNARY ACTIVITY OF THE HARAMACHI SEGMENT OF THE FUTABA FAULT IN NORTHEAST JAPAN THROUGH TOPOGRAPHIC ANAGLYPH IMAGES AND BOREHOLE CORE SEDIMENT ANALYSIS Open
The Haramachi Fault segment in the northeastern part of Honshu Island, Japan, has mainly sinistral fault movements with minor reverse component within the Futaba Fault Zone in the northeastern Japan arc. The 2011 Mw 9.0 earthquake occurred…
View article: Transient Response and Adjustment Timescales of Channel Width and Angle of Valley-Side Slopes to Accelerated Incision
Transient Response and Adjustment Timescales of Channel Width and Angle of Valley-Side Slopes to Accelerated Incision Open
Studying bedrock rivers during their transient states helps understand the response of a fluvial system to changed boundary conditions. Although studies show how river form adjusts to changes in incision or rock uplift rates, field constra…
View article: Development of Model of Seismic Source Characteristics at the Ikata Site Based on Guidelines for SSHAC Level 3
Development of Model of Seismic Source Characteristics at the Ikata Site Based on Guidelines for SSHAC Level 3 Open
2011年東北地方太平洋沖地震や2016年熊本地震等の発生により,地震ハザード評価の高度化への関心が一段と高まっている.大きな地震が発生する度に新たな知見が判明する中,評価に必要なパラメータの不確かさの項目と範囲を検討し,その影響度を確率論的地震ハザード解析によって事前に捉えておくことが重要である.伊方SSHACプロジェクトは,国内で初めてSSHACレベル3ガイドラインを適用して確率論的地震ハザード解析を実施した試みである.本稿では,長大断層である中央構造線断層帯や南海トラ…
View article: Evaluating variability in coseismic slips of paleoearthquakes from an incomplete slip history: an example from displaced terrace flights across the Kamishiro fault, central Japan
Evaluating variability in coseismic slips of paleoearthquakes from an incomplete slip history: an example from displaced terrace flights across the Kamishiro fault, central Japan Open
Examining the regularity in slip over seismic cycles leads to an understanding of earthquake recurrence and provides the basis for probabilistic seismic hazard assessment. Systematic analysis of three-dimensional paleoseismic trenches and …
View article: Evaluating variability in coseismic slips of paleo-earthquakes from an incomplete slip history: an example from displaced terrace flights across the Kamishiro fault, central Japan
Evaluating variability in coseismic slips of paleo-earthquakes from an incomplete slip history: an example from displaced terrace flights across the Kamishiro fault, central Japan Open
Examining the regularity in slip over seismic cycles leads to an understanding of earthquake recurrence and provides the basis for probabilistic seismic hazard assessment. Systematic analysis of three-dimensional paleoseismic trenches and …
View article: Evaluating variability in coseismic slips of paleo-earthquakes from an incomplete slip history: an example from displaced terrace flights across the Kamishiro fault, central Japan
Evaluating variability in coseismic slips of paleo-earthquakes from an incomplete slip history: an example from displaced terrace flights across the Kamishiro fault, central Japan Open
Examining the regularity in slip over seismic cycles leads to an understanding of earthquake recurrence and provides the basis for probabilistic seismic hazard assessment. Systematic analysis of three-dimensional paleoseismic trenches and …
View article: Evaluating variability in coseismic slips of paleo-earthquakes using a flight of displaced terraces across the Kamishiro fault, Itoigawa-Shizuoka Tectonic Line, central Japan
Evaluating variability in coseismic slips of paleo-earthquakes using a flight of displaced terraces across the Kamishiro fault, Itoigawa-Shizuoka Tectonic Line, central Japan Open
Examining the regularity between events during an earthquake slip leads to an understanding of earthquake recurrence and provides the basis for probabilistic seismic hazard assessment. Generally, scientists use systematic analysis of three…
View article: MECHANISM OF CLIMATE CHANGE MITIGATION IN MANGROVE-SEAGRASS COUPLED ECOSYSTEM -MATHEMATICAL MODEL ANALYSIS-
MECHANISM OF CLIMATE CHANGE MITIGATION IN MANGROVE-SEAGRASS COUPLED ECOSYSTEM -MATHEMATICAL MODEL ANALYSIS- Open
マングローブ・海草場は高い気候変動緩和機能を持つ可能性がある．この機能は，大気CO2の吸収，吸収した炭素の生物生産による固定，固定した炭素の堆積物深部への貯留，という一連のプロセスに支配されるが，その実態は未解明である．本研究では，このプロセスの実態と支配要因を明らかにするため，浮遊系・底生系での生物化学物理過程を網羅的に組み込んだマングローブ・海草複合生態系モデルを開発し，西表島ユツン海域に適用した．解析の結果，炭素固定の主要因はマングローブ・海草の純生産と底生動物の殻生…
View article: Surface faulting earthquake clustering controlled by fault and shear-zone interactions
Surface faulting earthquake clustering controlled by fault and shear-zone interactions Open
Surface faulting earthquakes are known to cluster in time, from historical and palaeoseismic studies, but the mechanism(s) responsible for clustering, such as fault interaction, strain-storage, and evolving dynamic topography, are poorly q…
View article: The 1596 Keicho Earthquake, a 5‐Day, 300‐km‐Long Sequential Rupture Event in the Median Tectonic Line Fault Zone, Southwestern Japan
The 1596 Keicho Earthquake, a 5‐Day, 300‐km‐Long Sequential Rupture Event in the Median Tectonic Line Fault Zone, Southwestern Japan Open
Historical accounts and geological surveys suggest that a sequential rupture event occurred in 1596 CE in the Median Tectonic Line fault zone (MTLFZ) in southwestern Japan. During this event, known as the 1596 Keicho earthquake, the ruptur…