Abstract:

Seismic activity suddenly started in the end of 2020 at the northernmost part of the Noto peninsula. Seismological and geodetical observations suggest that the lower crust (20–30 km depth) beneath the earthquake swarm contains some amounts of fluids and the fluids have permeated into pre-existing faults in the upper crust, thereby triggering marked upward migration of seismicity. During this active earthquake swarm, the Noto peninsula earthquake (M7.6) occurred on January 1st, 2024, which was the 2nd largest crustal earthquake beneath the Japanese Islands over the past 150 years. In the lecture, I review seismic activity in the Noto peninsula and show a future probability of the occurrence of large earthquakes in Japan.

Speaker: Dr. Junichi Nakajima (Institute of Science Tokyo)

Host: Christine Houser, ELSI.

Date: Wed. 20 Nov. 16:00-17:00 JST

Venue: Mishima Hall, ELSI (hybrid)