Coupled effects between the present-day segment movement rate of the Anninghe active fault zone in Southwest China and fault-induced landslides

Abstract

The present-day segmented activity of a fault is an important basic index for analyzing the possible occurrence of strong earthquakes in the future and the landslides along a fault zone and adjacent areas. This work investigates the Anninghe (ANH) fault, an important boundary fault on the eastern Tibetan Plateau. This study employed geological surveys, remote sensing image interpretation, high-precision GNSS monitoring, and theoretical calculations. The active ANH fault was subdivided into 17 segments, and a high-precision crustal deformation monitoring network consisting of 18 high-precision GNSS stations and 8 monitoring profiles was established along the ANH fault zone. The present-day movement rates of different sections of the ANH fault zone were quantified based on the monitoring results. The development and distribution characteristics of large-scale landslides were identified, and their sliding mode was summarized along the ANH fault zone and adjacent areas. The coupled correlation between the present-day segment slip rate of the ANH fault zone and large-scale landslides was accurately described. According to the research results, a systematic understanding of the fault-induced landslides and disaster control mechanisms was obtained, the feasibility of short-term earthquake warning based on local anomalies from crustal deformation monitoring data was explored, and a key technology for preventing and controlling fault-controlled landslide risks in the active fault zone was proposed.