Geochemical observation research of material cycles beneath the northeastern Noto Peninsula

Abstract

The earthquake swarm at the northeastern Noto Peninsula, including the 2024 Noto Earthquake, has continued for a long duration. In order to elucidate geochemical cycles beneath the northeastern Noto Peninsula during the earthquake swarm period, temporal variations of spring chemical and isotopic compositions were investigated in this study. Temporal variations of obtained geochemical data such as 3He/4He ratios may reflect changes of permeability of aquifer rocks associated with seismic activity, or changes of contributions from the deep fluid with mantle-derived components due to the behavior of the deep fluid.