Solid Earth Sciences (S)
Session Sub-category Complex & General(CG)
Session ID S-CG56
Title Science of Slow and Fast Earthquakes
Short Title Science of Slow and Fast Earthquakes
Main Convener Name Satoshi Ide
Affiliation Department of Earth an Planetary Science, University of Tokyo
Co-Convener 1 Name Saeko Kita
Affiliation IISEE, Building Research Institute, National Research and Development Agency, Japan
Co-Convener 2 Name Yohei Hamada
Affiliation Japan Agency for Marine-Earth Science and Technology
Co-Convener 3 Name Yihe Huang
Affiliation University of Michigan Ann Arbor
Co-Convener 4 Name Szu-Ting Kuo
Affiliation Sinotech Engineering Consultants Inc.
Co-Convener 5 Name Songqiao Shawn Wei
Affiliation Michigan State University
Session Language 
E
Scope 
Growing evidence of geophysical observations has demonstrated that earthquake faults host a broad spectrum of slip modes from slow to unstable fast slip, which may lead to complexity in the nucleation process, rupture behavior, and slip and energy distribution. This discovery has boosted up vigorous discussions about the connection between slow and fast earthquakes including large earthquakes. How and when does a slow earthquake become a fast earthquake? What geological and geophysical structural differences distinguish slow earthquakes from fast ones? To answer these fundamental questions, it is particularly important to proceed further global and interdisciplinary research through the integration of geophysics, seismology, geodesy, geology, and physics. Advancements in measurement technology, the application of information science and statistical methods to seismic big data, and the utilization of high-performance computing are required as key ingredients in accelerating the integration. In addition, various subduction zone phenomena, including earthquakes, volcanic eruptions, and surface processes , often occur as a cascading series of events, necessitating a system-wide, integrative approach.   This session encourages presentations shedding light on geophysical observations, data analysis, field studies, laboratory experiments, numerical modeling, and theoretical studies, as well as comparative investigations  across onshore fault zones and multiple subduction systems. We also welcome contributions from cutting-edge science and technology fields that explore development of novel measurements, data-driven analysis, and large-scale computation that are relevant to our understanding of slow and fast earthquakes and other subduction zone phenomena. This session is organized by the JpGU Science of Slow and Fast Earthquake Focus Group and the SZ4D initiative.
Presentation Format Oral and Poster presentation
Joint Session with AOGS ,EGU ,TCGU
Invited Authors Chun-Yu Ke (National Taiwan University)
Suli Yao (ENS Paris)
Quentin Higueret (University Grenoble Alpes)
Yuriko Iwasaki (University of California, Santa Cruz)
Jiaxuan Li (University of Houston)
Yuto Sasaki (Osaka University)
Keishi Okazaki (Hiroshima University)
Andy Newman (Georgia Institute of Technology)
Samer Naif (Georgia Institute of Technology)
Jared Thomas Bryan (Massachusetts Institute of Technology)
William Benjamin Frank (Massachusetts Institute of Technology)
Ahmed Elbanna (University of Southern California)
Time Presentation No Title Presenter
Oral Presentation May 25 PM2
15:30 - 15:45 SCG56-01 Experimental investigation of dehydration weakening and embrittlement of antigorite serpentinite Keishi Okazaki
15:45 - 16:00 SCG56-02 Shear Deformation of Pelitic Schists at High Pore Pressure: Relevance to the Nankai Trough Seismogenic Zone Suzuka Yagi
16:00 - 16:15 SCG56-03 Temperature-dependent recurrence time of fault-valve behavior at slow-to-fast seismogenic zones revealed by laboratory crack-sealing and silica vein formation Masaoki Uno
16:15 - 16:30 SCG56-04 Stress amplification and rapid creep in a subduction mélange Shota Komagino
16:30 - 16:45 SCG56-05 Monitoring one-dimensional Vs profiles at shallow parts of the Nankai accretionary prism Takashi Tonegawa
16:45 - 17:00 SCG56-06 Illuminating fault structural control on interplate earthquakes in the Northeastern Japan subduction zone Yihe Huang
Oral Presentation May 26 AM1
9:00 - 9:15 SCG56-07 Electromagnetic constraints on fluids, plate coupling, and megathrust earthquake behavior Samer Naif
9:15 - 9:30 SCG56-08 Resistivity heterogeneity along the plate boundary in the Nankai Trough off Kumano Manaka Kuroda
9:30 - 9:45 SCG56-09 Seimological, structural and geomechanical effects of Seamount Subduction from Seismic Reflection and Refraction imaging in Hyuga-nada, Japan Rie Nakata
9:45 - 10:00 SCG56-10 Seismic velocity and anisotropy structure of the Hyuga-nada forearc, southwest Japan, revealed by 3D active-source tomography Ryuta Arai
10:00 - 10:15 SCG56-11 Mechanical properties of crystalline host rocks at potential long-term borehole monitoring site in eastern Taiwan Szu-Ting Kuo
10:15 - 10:30 SCG56-12 Slow Earthquake Fossils in a Collisional Orogen: Multi-scale Geological Evidence from High-Strain Shear Zones in Eastern Taiwan Gong-ruei Ho
Oral Presentation May 26 AM2
10:45 - 11:00 SCG56-13 Early results from a Dense, Deep-water GNSS-Acoustic Network in the Aleutian 1946 Tsunami Earthquake Rupture Area Andrew Vern Newman
11:00 - 11:15 SCG56-14 Tracking short-term slow slip along Nankai with GNSS: temporal evolution of slip rate and interaction with the seismogenic zone Louise Maubant
11:15 - 11:30 SCG56-15 Detection of short-term SSEs around Okinawa Island using an ultra-dense GNSS data Takuya NISHIMURA
11:30 - 11:45 SCG56-16 Spatiotemporal distribution and along-strike variations of long-term slow slip events in the entire Nankai Trough inferred from GNSS data Ryota Takagi
11:45 - 12:00 SCG56-17 Detection of Possible Slow Slip Events Using Seismic & Geodetic Approaches in Costa Rica Takashi Nishizawa
12:00 - 12:15 SCG56-18 Interactions Between Slow and Fast Megathrust Slip Revealed by the 2024–2025 Hyuga-nada Earthquake Sequence XIAOLONG ZHANG
Oral Presentation May 26 PM1
13:45 - 14:00 SCG56-19 Intraslab Seismicity Near Subducted Seamounts Induced by the 2019 Slow Slip Event Offshore the Hikurangi Subduction Zone, New Zealand Yuriko Iwasaki
14:00 - 14:15 SCG56-20 Effects of long-term slow slip events on in-slab stresses and seismicity in southwestern, Japan Saeko Kita
14:15 - 14:30 SCG56-21 Slow Earthquake Activity and the Role of Seamount Subduction in the Guerrero Seismic Gap, Mexico Yoshihiro Ito
14:30 - 14:45 SCG56-22 The 2025 Mw7.5 Aomori-Oki Megathrust Sequence and a Slip-Parallel Seismic Belt to the Trench Keisuke Yoshida
14:45 - 15:00 SCG56-23 Close Interaction of slow and fast earthquakes during late-2025 activity in the Japan Trench Kodai Sagae
15:00 - 15:15 SCG56-24 Slow-earthquake nucleation in the Nankai subduction megathrust learned with physics-informed neural networks Daisuke Sato
Oral Presentation May 26 PM2
15:30 - 15:45 SCG56-25 Ultra-Low-Angle Faults Produce Giant Earthquakes Satoshi Ide
15:45 - 16:00 SCG56-26 Large Earthquakes and Stress State: b-value and fault instability Yuki Agata
16:00 - 16:15 SCG56-27 Recovery of b-values in aftershock sequences of crustal earthquakes in Japan Francesca Burkett
16:15 - 16:30 SCG56-28 Global Analysis of b-Value and Stress-Related Parameters in Subduction Zones Kota Saito
16:30 - 16:45 SCG56-29 Stopping phase reveals abrupt arrest of large strike-slip earthquakes Yoshihiro Kaneko
16:45 - 17:00 SCG56-30 Resolve Earthquake Rupture Behaviors through Deciphering Near-fault Velocity Pulses Suli Yao
Oral Presentation May 27 AM1
9:00 - 9:15 SCG56-31 Integrated Imaging of Quasi-Static Deformation and Brittle Failure During Dike Intrusions with Distributed Acoustic Sensing Jiaxuan Li
9:15 - 9:30 SCG56-32 Unveiling Hidden Slow-Slip on the San Jacinto Fault (California) via Train-Generated Seismic Interferometry quentin higueret
9:30 - 9:45 SCG56-33 Observations of a Slow Slip Event Using Seafloor Borehole Tiltmeters and the Expansion of the Monitoring Network in the Nankai Trough Shuhei Tsuji
9:45 - 10:00 SCG56-34 Accelerated Nucleation Preceding the 2025 Mw 6.9 Sanriku Earthquake: Insights from Seismicity activity and Repeating Earthquakes Xinrong Hou
10:00 - 10:15 SCG56-35 Foreshock Acceleration Linked to Slow Earthquakes Before a Large Earthquake: Implications for Two-Stage Aseismic Processes Tomoaki Nishikawa
10:15 - 10:30 SCG56-36 Progressive localization of foreshocks prior to shallow crustal earthquakes Aitaro Kato
Oral Presentation May 27 AM2
10:45 - 11:00 SCG56-37 Pump-probe monitoring at Mount St. Helens using slow slip on the Cascadia megathrust Jared Thomas Bryan
11:00 - 11:15 SCG56-38 Temperature controls the episodic dynamics of deep slow slip William Benjamin Frank
11:15 - 11:30 SCG56-39 Defining Low-Frequency Earthquakes as Small Stress-Drop Events Using Attenuation- and Site-Corrected Spectra Seiya Yano
11:30 - 11:45 SCG56-40 Toward Intermediate-term Large Earthquake Forecasting: Probability Gains from Slow Slip Events, Repeating Earthquakes, and Seismic Quiescence Yosihiko Ogata
11:45 - 12:00 SCG56-41 The role of permanent upper-plate deformation in coseismic deformation and megathrust earthquakes dynamics Manel Prada
12:00 - 12:15 SCG56-42 Microscopic dynamics governing the slow and fast earthquake statistics: Reproduction by analogue experiments using fluid-granular multiphase flow Yuto Sasaki
Oral Presentation May 27 PM1
13:45 - 14:00 SCG56-43 Spectral source scaling from 1D to 2D: Size and shape effects on dm-scale PMMA laboratory faults Chun-Yu Ke
14:00 - 14:15 SCG56-44 Secondary Weakening in dm-Scale Laboratory Earthquakes: Frictional Origin or Rigid-Body Artifact? Gauss Te-Chuan Chang
14:15 - 14:30 SCG56-45 Stress-Controlled Shear Localization Governs Slow-to-Fast Slip Behavior in a Decimeter-Scale Quartz Gouge Fault Giacomo Mastella
14:30 - 14:45 SCG56-46 Elastic-wave imaging of heterogeneous fault zones: Laboratory insights into slip stability Michele De Solda
14:45 - 15:00 SCG56-47 Earthquake stress drops in the Alaska, central Chile, and Tonga subduction zones Songqiao Shawn Wei
15:00 - 15:15 SCG56-48 Ranking Subduction Features Driving the Occurrence of Shallow and Deep Slow-Slip Events (SSEs) Mario Arroyo-Solorzano
Oral Presentation May 27 PM2
15:30 - 15:45 SCG56-49 Stochastic Fault Zone Strength As A Driver For The Emergence of Small Repeating Earthquakes Ahmed Elbanna
15:45 - 16:00 SCG56-50 Spontaneous segmentation of slow slip events on a homogeneous planar fault Kento Nishikiori
16:00 - 16:15 SCG56-51 Linear and nonlinear stability of rate-and-state faults Robert C Viesca
16:15 - 16:30 SCG56-52 Numerical study of estimating time interval between successive megathrust earthquakes along the Nankai Trough, Japan: Incorporating viscoelastic crustal deformation Sota Murakami
16:30 - 16:45 SCG56-53 Multi-scale rate-and-state friction and coarse-graining of hierarchical fault heterogeneity Reiju Norisugi
16:45 - 17:00 SCG56-54 Partial ruptures, cascading multi-fault ruptures, and aftershocks in 2D random fault network So Ozawa
Presentation No Title Presenter
Poster Presentation May 27 PM3
SCG56-P01 Kinematic characteristics of shallow tremors Shunsuke Takemura
SCG56-P02 Calibration of seafloor temperature by tracing AUV-NEXT along the Nankai Trough Keisuke Ariyoshi
SCG56-P03 Revisiting the early postseismic deformation of the 2003 Tokachi-oki earthquake Yuji Itoh
SCG56-P04 Spatiotemporal Characteristics of Tectonic Tremor in California Satoshi Ide
SCG56-P05 Comparative Analysis of Seismicity across Three Depth-Dependent Slip Regimes in the Japan Trench Subduction Zone Yuta Ito
SCG56-P06 Detection of Small Slow Slip Events from Low-Frequency Earthquakes along the Nankai Trough Ryota Seki
SCG56-P07 Multi-Episode Earthquake Swarms near the Ryukyu Trench Axis Southeast of Okinoerabu Island Mamoru Nakamura
SCG56-P08 Foreshock Occurrence Rate and Location Characteristics Based on Different Definitions Motomasa Murata
SCG56-P09 Analysis of Tremor Activities Post-2022 Mw 7.0 Chishang Earthquake Sequence in the Eurasian-Philippine Sea Plate Suture Zone En-Jui Lee
SCG56-P10 Multiscale earthquake cycle simulation under velocity-strengthening versus velocity-weakening backgrounds Ryoko Nakata
SCG56-P11 Dynamic Rupture Modeling of the 2024 Mw 7.5 Noto Earthquake Using a Discontinuous Galerkin Method Isaac Ruben Valverde Guerrero
SCG56-P12 Time-Dependent Seismic Tomography of the Noto Peninsula: Evidence for Fluid Migration Before the 2024 M7.6 Earthquake Hanle Zou
SCG56-P13 Experimental study of the mechanical behavior of outer-rise faults and the effects of fluids in subduction zones Kotaro Muramatsu
SCG56-P14 Co- and post-seismic slip distributions of the 2025 off the east coast of Aomori earthquake (M7.5), inferred from dense GNSS observation Soichiro Tashiro
SCG56-P15 Multi-disciplinary Observation of Fault Slip in Laboratory Shear Slip Experiments Takaaki Kawahito
SCG56-P16 Controls of weak-layer strength contrast and position on décollement flat-ramp formation from sandbox analogue experiments Satoshi Tonai
SCG56-P17 Load and deformation patterns during prolonged wedge growth in dry sand analogue experiments Nodoka Oda
SCG56-P18 Silica-sealing zone at the base of seismogenic zone revealed by geochemical machine-learning of metamorphosed sediments Taito Amari
SCG56-P19 Simulation of Tidal Stress Influence on Earthquake Generation and Seismicity Patterns Taiki Watanabe
SCG56-P20 A temporal decrease in Gutenberg-Richter b-values on heterogeneous velocity-weakening faults and its physical mechanism Kikuchi Mei
SCG56-P21 Deep learning-based forecasting of time to failure and moment magnitude in earthquake sequence simulations Reiju Norisugi
SCG56-P22 Non-Parametric Hypothesis Test for Detecting Prompt Gravity Signals from an Earthquake using a Superconducting Gravimeter John J. Oh
SCG56-P23 What Controls the Rupture Extent of the 2025 Mw 7.6 Aomori Megathrust Earthquake in Northeast Japan? Shaoyang Li
SCG56-P24 Status of YeMiGO: Underground Micro-Gravity Observatory in South Korea JeongCho Kim
SCG56-P25 ENIGMA: East-Asian Network Initiative for Gravity Measurement Alliance whansun kim
SCG56-P26 Comparing Superconducting Gravimeter and Seismometers for Earthquake Detection Edwin J. Son
SCG56-P27 Transient displacement event associated with the November 2025 Sanriku-Oki earthquake Yutaro Okada
SCG56-P28 Spatial Characteristics Along the Ryukyu Trench: Okinawa to Amami Ōshima Island inferred from GEONET date Shinnosuke Sakamoto
SCG56-P29 Seismic moment tensor Analysis of the 2025 Myanmar earthquake (Mw.7.7) Satsuki Goto
SCG56-P30 Early postseismic deformation of the 2025 Aomori-oki earthquake using high-rate GNSS Louise Maubant
SCG56-P31 Revisiting Repeating-Earthquake Scaling after the 2011 Tohoku-Oki Earthquake Using Repeating Earthquakes and a Postseismic Deformation Model Yu Ohno
SCG56-P32 Numerical Simulations of Deep Short-term Slow Slip Events in Western Shikoku Sorato Nishioka
SCG56-P33 Relative Changes in Quartz Precipitation Rates During the Seismic Cycle from Microstructural Observations: Minami-Awa Fault of the Mugi Mélange in the Cretaceous Shimanto Belt Takahiro Hosokawa
SCG56-P34 Miyagi-oki locked region after the Tohoku-oki earthquake Keisuke Yoshida
SCG56-P35 Long-term slow slip events (L-SSE) in the Western Nankai Trough during 2017 - 2024 as deduced by the nationwide GNSS network Sho Ishige
SCG56-P36 Hypocenter determination of shallow low-frequency tremors triggered by the 2024 Hyuga-nada earthquake using the source-scanning algorithm with N-net data Yuma Mukai
SCG56-P37 Detection of deep low frequency earthquakes in a non-volcanic area in central Kyushu Satoru Baba
SCG56-P38 Recovering True Source Spectra of Laboratory Earthquakes Using Broadband-Calibrated Acoustic Emission Sensors Ting-Wei Liu
SCG56-P39 Stress heterogeneity and shift in active region due to seamount subduction in accretionary prism: numerical analog experiment with discrete element method Zhuyuan Lin
SCG56-P40 Numerical modeling of the Kanto earthquakes and the influence of the locked region on Boso slow slip events Takanori Matsuzawa
SCG56-P41 Rupture hesitation in a complex earthquake revealed by potency density tensor inversion Ryo Okuwaki
SCG56-P42 Detection of shallow very low frequency earthquakes in Hyuga-nada using the matched-filter technique Yuya Imamura
SCG56-P43 Initial Evolution of the Sendai Swarm After the 2011 Tohoku-oki Earthquake: Implications for a Slow-to-Fast Transition Haru Kato
SCG56-P44 Slow Slip Event Detection and Associated Seismic Activation in the Hikurangi Subduction Zone, New Zealand Natsumi Takeda
SCG56-P45 An attempt to represent various slip phenomena using a simple friction law: End of slip Takane Hori
SCG56-P46 Fault immaturity and low rupture velocity in compressional settings: insights from the 2022 Mw 5.8 Adriatic earthquake Lorenzo Petracchini
SCG56-P47 Recurrence analysis on slow slip events using renewal processes: Four case studies in Japan Keisuke Yano
SCG56-P48 Dual Seismic-Gravimetric Monitoring with Co-Located Broadband Seismometer and Superconducting Gravimeter John J. Oh
SCG56-P49 Coherence Analysis of Co-Located Superconducting Gravimeter and Broadband Seismometer Data Edwin J. Son
SCG56-P50 Comparative DEM Analysis of Subducting Horst and Graben Geometries Jian Chen
SCG56-P51 Constraints on the Synchronization Between Tremor and a Short-Term Slow Slip Event in Shikoku from Tilt-Based Slip Process Estimation Kaho Kito
SCG56-P52 Investigation of slow strain steps with the 1500-m laser strainmeter at Kamioka Akiteru Takamori