Causal mechanisms of seismo-EM phenomena during the 1965-1967 Matsushiro earthquake swarm.

ABSTRACT: The 1965-1967 Matsushiro earthquake swarm in central Japan exhibited two unique characteristics. The first was a hydro-mechanical crust rupture resulting from degassing, volume expansion of CO₂/water, and a crack opening within the critically stressed crust under a strike-slip stress. The other was, despite the lower total seismic energy, the occurrence of complexed seismo-electromagnetic (seismo-EM) phenomena of the geomagnetic intensity increase, unusual earthquake lights (EQLs) and atmospheric electric field (AEF) variations. Although the basic rupture process of this swarm of earthquakes is reasonably understood in terms of hydro-mechanical crust rupture, the associated seismo-EM processes remain largely unexplained. Here, we describe a series of seismo-EM mechanisms involve

SUBMITTER: Enomoto Y 

PROVIDER: S-EPMC5359576 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature