The 2024 M_(j) 7.6 Noto Peninsula, Japan earthquake caused by the fluid flow in the crust  

作　　者：Yuzo Ishikawa Ling Bai 

机构地区：[1]Center for Integrated Research and Education of Natural Hazards,Shizuoka University,Shizuoka,422-8529,Japan [2]State Key Laboratory of Tibetan Plateau Earth System,Environment and Resources(TPESER),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing,100101,China [3]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Earthquake Research Advances》2024年第3期1-6,共6页地震研究进展（英文）

基　　金：supported by the National Nature Science Foundation of China (No. 42130312)。

摘　　要：On January 1, 2024 at 16:10:09 JST, an M_(j) 7.6 earthquake struck the Noto Peninsula in the southern part of the Sea of Japan. This location has been experiencing an earthquake swarm for more than three years. Here, we provide an overview of this earthquake, focusing on the slip distribution of the mainshock and its relationship with the preceding swarm. We also reexamined the source areas of other large earthquakes that occurred around the Sea of Japan in the past and compared them with the Matsushiro earthquake swarm in central Japan from1964 to 1968. The difference between the Matsushiro earthquake swarm and the Noto earthquake swarm is the surrounding stress field. The Matsushiro earthquake swarm was a strike-slip stress field, so the cracks in the crust were oriented vertically. This allowed fluids seeped from the depths to rise and flow out to the surface. On the other hand, the Noto area was a reverse fault stress field. Therefore, the cracks in the earth's crust were oriented horizontally. Fluids flowing underground in deep areas could not rise and spread over a wide area in the horizontal plane. This may have caused a large amount of fluid to accumulate underground, triggering a large earthquake. Although our proposed mechanism does not take into account other complex geological conditions into consideration, it may provide a simple way to explain why the Noto swarm is followed by a large earthquake while other swarms are not.

关 键 词：The M 7.6 Noto Peninsular earthquake Earthquake swarm Fluid triggering Strike-slip fault Reverse fault 

分 类 号：P315[天文地球—地震学]