“Boomerang” earthquakes, which reverse direction and travel back the way they came, can occur along simple faults, not just complex ones, according to MIT research that also suggests these earthquakes may be more more common than previously thought.

MIT is a renowned institution for education and research, offering insights into science, engineering, and technology. Through publications, research papers, and academic programs, MIT's platform provides insights into  research, innovation, and education in various fields. Students, researchers, and technology enthusiasts can learn about MIT's contributions to science and technology and explore opportunities for academic and professional development.

MIT News

MIT researchers discovered that "boomerang" earthquakes—which reverse direction and travel back along their path—can occur on simple, straight faults, not just complex fault systems. The study identifies three key conditions: unidirectional propagation, sufficient distance traveled, and rapidly changing friction along the fault. These conditions are relatively common, suggesting such events may be more frequent than previously detected. The findings have implications for seismic hazard assessment, as buildings experience amplified shaking in the direction of rupture, meaning areas could be shaken twice during a single event.

New study unveils the mechanism behind “boomerang” earthquakes