Spatiotemporal Evolution of Early Aftershocks Following the 2025 Mw 7.1 Dingri, Southern Tibet, Earthquake

Abstract The spatial distribution and temporal evolution of early aftershocks provide valuable insights into understanding the stress transfer process following large mainshocks. Unfortunately, for poorly instrumented regions, due to the sparsity of seismic monitoring stations, and the difficulty in early aftershock detection, the early aftershock catalogs generally have relatively high magnitudes of completeness and large location uncertainties, which prevents accurate depiction of the spatiotemporal evolution of early aftershocks. The 2025 Mw 7.1 Dingri, southern Tibet, earthquake occurred in Dingri County, Rikaze City, the Tibet Autonomous region, China. Field investigations, together with finite-fault inversion and aftershock observations, suggest complex fault structure around the mainshock epicenter. We applied a matched-filter technique to detect early aftershocks following the Dingri earthquake. Using 3224 well-relocated aftershocks as templates, we scanned through continuous data of both permanent and temporary seismic stations within the first ∼3 days. Compared to 1399 aftershocks and a magnitude of completeness ∼2.5 reported by the China Earthquake Networks Center, 7179 aftershocks were detected, corresponding to fivefold more earthquakes. The newly detected catalog depicted the main fault geometry and highlighted the spatial variation of the early aftershock distribution.