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Room: Tikahtnu Ballroom C

Date: 5/3/2024

Session Time: 8:00 AM to 9:15 AM (local time)

On the New Year’s Day 2024, a moment magnitude (Mw) 7.5 (Japanese Metrological Agency-JMA magnitude MJMA 7.6) occurred beneath the Noto Peninsula in Central Japan. The mainshock ruptured along a NE-SW trending thrust fault bilaterally for about 150 km. It was preceded by magnitude 5.5 and 4.6 foreshocks about 4 and 2 minutes before, and was followed by 238 M3.5 and larger aftershocks by 6 January 2024. Shaking from the mainshock reached the highest JMA intensity of 7 and produced significant damage and casualties in the Noto Peninsula and surrounding regions. A unique feature of this sequence is that it was preceded by an intense earthquake swarm, which started beneath the Noto Peninsula in November 2020 close to the epicenter of the M7.5 mainshock. The swarm was accompanied by up to 7 cm of uplift over the first two years. The largest event in the swarm sequence prior to the M7.5 mainshock was a M6.2 earthquake on 5 May 2023. Recent studies have shown that the swarm activity migrated from larger depths to shallower depths through a complex fault network, likely driven by upward movement of crustal fluids. 

In this late breaking SSA session, we invite contributions from all disciplines that are relevant to this sequence. These include, but are not limited to, seismological and geodetic studies on the M7.5 mainshock rupture properties, the relationship between the mainshock and the ongoing earthquake swarm, subsurface imaging in the source region beneath the Noto Peninsula, potential remote triggering in Japan and elsewhere around the world, temporal changes in site response and subsurface medium properties tsunami generation, earthquake and tsunami early warning, and potential impact to the building structures. We also welcome submissions on disaster mitigation strategies based on this earthquake, as well as other interdisciplinary contributions. 

Conveners:

Dara Goldberg, U.S. Geological Survey (degoldberg@usgs.gov)
Sarah Minson, U.S. Geological Survey (sminson@usgs.gov)
Takuya Nishimura, Kyoto University (nishimura.takuya.4s@kyoto-u.ac.jp)
Zhigang Peng, Georgia Institute of Technology (zpeng@gatech.edu)
Dun Wang, Chinese University of Geosciences (wangdun@cug.edu.cn)
Suguru Yabe, Geological Survey of Japan (s.yabe@aist.go.jp)

Oral Presentations