International Joint Workshop on
Slow-to-Fast Earthquakes 2024

July 26, 2024

Plenary Sessions

• The 2024 M7.6 Noto earthquake and seismic swarm

Scope:

On January 1, 2024, an M7.6 earthquake occurred along the northern part of the Noto Peninsula, Central Japan. The dynamic rupture propagated bilaterally along multiple faults over 100 km, causing strong ground motion, tsunami, and significant uplift in the onshore and offshore up to approximately 4 m. Around the nucleation point of the M7.6 event, an intense earthquake swarm with diffusive migration had lasted since December 2020, including an M6.5 earthquake in 2023, accompanied by a gradual crustal deformation. Previous studies suggest that fluids supplied into the lower crustal level are involved in these activities. In this session, we would like to welcome presentations regarding the Noto earthquake and seismic swarms using a variety of approaches, including geophysical, geological, and geochemical observations, as well as data analysis and numerical simulation.

Keynote speakers: Cristiano Collettini (Dipartimento di Scienze della Terra, La Sapienza, University of Roma, Italy), Aitaro Kato (ERI, UTokyo, Japan)

Moderators: Yoshiyuki Tanaka, Asuka Yamaguchi, Aitaro Kato, Takane Hori

• Fault rheology of plate boundary at laboratory, outcrop, and geophysical exploration scales

Scope:

The spatio-temporal scales of the structure and state changes of the slow and fast earthquake regions range from a few seconds to millions of years and from a few micrometers to hundreds of kilometers, and it is important to integrate observational and material studies from shallow to deep regions. This topic compares the scales of structures, thermal structures, ruptures, and physical properties of seismogenic zones to understand the geological and geophysical structures around plate boundaries and slow earthquakes as they vary with depth in convergent zones, especially subduction zones.

Keynote speakers: Ryuta Arai (JAMSTEC, Japan), Melodie French (Rice Univ. USA)

Moderators: Makoto Otsubo, Yoshihiro Ito, Akiko Takeo, Shunsuke Takemura, Yusuke Shimura, Hanaya Okuda

• Induced or controlled earthquakes, –What determines the initiation of slow and fast earthquakes? –

Scope:

In order to understand the physical and chemical phenomena underlying the Slow-to-Fast phenomenon, this session aims to discuss the processes leading to the occurrence of fast phenomena, particularly their induction. The session primarily focuses on research presentations related to the induction or triggering of slow and/or fast earthquakes from perspectives such as seismicity induced by industrial activities, earthquake generation under artificial conditions through experiments, statistical and probabilistic approaches, modeling, and chemical processes. Presentations aiming at predicting earthquake occurrences, observations related to the preparatory processes of seismic sources, numerical modeling, and presentations on experiments and observations at micro and macro scales are also welcomed. 

Keynote speakers: Hanae Saishu (AIST, Japan)

Moderators: Takanori Matsuzawa, Yohei Hamada, Satoshi Ide, Saeko Kita