Imaging Earthquake Asperities with Distributed Acoustic Sensing

Researchers have used distributed acoustic sensing (DAS) to image the break of earthquake asperities, providing insights into fault rupture and earthquake nucleation. DAS, which utilizes fiber-optic cables as seismic antennas, allows for high-resolution imaging of seismic waves. By analyzing the frequency-dependent seismic radiation from subduction zone megathrust ruptures, the study reveals the complexity of earthquake dynamics and the role of the Earth's surface in controlling depth-dependent seismic radiation. The findings contribute to a better understanding of earthquake processes and could aid in earthquake forecasting and hazard assessment.