Complex faulting confounds earthquake research in the Charlevoix Seismic Zone, Quebec

Following every earthquake felt in eastern North America, journalists ask the eternal question, “Which fault is responsible for this earthquake?” In intraplate environments,such as the Charlevoix Seismic Zone (CSZ), Quebec, Canada, a definite answer seldom exists. Seismologists face major difficulties: most earthquakes occur at mid‐crustal depths, the Precambrian basement where most earthquakes occur is geologically complex, and fault locations …