9:00 AM - 9:15 AM
[SCG46-10] Recent crustal earthquakes in Japan related to fluid movement
★Invited Papers
Keywords:crustal fluid, seismicity, fault strength, crustal stress
It has long been pointed out that the fluid movement within the crust may influence the occurrence of earthquakes. In fact, there are abundant known examples of earthquakes occurring when fluids are injected into the subsurface. The primary mechanism thought to be responsible for this was the reduction in frictional strength when a fluid, such as water, intrudes into the fault, but more recently, attention has focused on the effects of fluid-induced aseismic slip.
Recent studies have shown that there are many instances in which crustal fluid movement appears to have contributed to earthquake occurrences in Japan. In this talk, I will introduce several recent examples of such earthquake sequences. Examples include the earthquake swarms in NE Japan triggered by the Tohoku earthquake, the 2017 M5.3 Kagoshima Bay earthquake, the 2019 M6.7 Yamagata-Oki earthquake, and the 2020-2023 Noto Peninsula earthquake swarm and related recent earthquakes.
Recent studies have shown that there are many instances in which crustal fluid movement appears to have contributed to earthquake occurrences in Japan. In this talk, I will introduce several recent examples of such earthquake sequences. Examples include the earthquake swarms in NE Japan triggered by the Tohoku earthquake, the 2017 M5.3 Kagoshima Bay earthquake, the 2019 M6.7 Yamagata-Oki earthquake, and the 2020-2023 Noto Peninsula earthquake swarm and related recent earthquakes.