Japan Geoscience Union Meeting 2023

Presentation information

[J] Online Poster

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG58] New Developments in fluid-rock Interactions: From Surface to Deep Subduction Zone

Sun. May 21, 2023 10:45 AM - 12:15 PM Online Poster Zoom Room (3) (Online Poster)

convener:Atsushi Okamoto(Graduate School of Environmental Studies), Jun Muto(Department of Earth Sciences, Tohoku University), Ikuo Katayama(Department of Earth and Planetary Systems Science, Hiroshima University), Junichi Nakajima(Department of Earth and Planetary Sciences, Tokyo Institute of Technology)

On-site poster schedule(2023/5/21 17:15-18:45)

10:45 AM - 12:15 PM

[SCG58-P07] Non-volcanic swarms in Noto and Wakayama and their deep crustal structure

*Junichi Nakajima1 (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology)

An earthquake swarm occurs in a confined area and consists of a number of successive similar-magnitude earthquakes, with no observations of clear mainshock. Swarm activity usually starts with no distinct seismic signals, lasts from months to years, and is often observed in volcanic and geothermal fields and near the vicinity of anthropogenic fluid injection wells. However, there are earthquake swarms, or concentrated seismicity, in non-volcanic areas in Japan. This study reports deep crustal stricture beneath the Noto-Hanto and Wakayama earthquake swarms and discuss the origin of these swarms in terms of upward fluid migration from the deep.