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Tectonic geomorphology of the Dayingjiang-Nantinghe fault belt between the Red River fault and the Sagaing Fault: Insight into deep dynamics and seismic hazards
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DOI：10.1016/j.geomorph.2026.110308.png)
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Abstract
En 中文
To the southeast of the Tibetan Plateau, between the nearly N- to NNW-oriented, right-lateral strike-slip Red River Fault (RRF) and Sagaing Fault (SGF), there exists a vast distributed shear zone composed of numerous NEtrending left-lateral strike-slip faults. This shear zone accommodates a significant amount of strain and generates numerous earthquakes. However, systematic studies on its genesis mechanisms and long-term tectonic activity are still lacking. This study focuses on the Dayingjiang-Nantinghe region, the northern part of this distributed shear zone, and systematically assesses its long-term tectonic activity using seven geomorphic indices derived from Digital Elevation Models (DEMs) for 353 drainage basins, complemented by field investigations, 14C dating, and Schmidt hammer rock strength measurements. Our results indicate that the spatial distribution of geomorphic features in this region is predominantly governed by tectonic forces, with minimal influence from lithology or precipitation. The most active geomorphic features are concentrated between the Wanding and Nantinghe faults, consistent with increased vertical deformation from InSAR observation and elevated rotation gradients from paleomagnetic analysis in this region. However, few earthquakes with Surface-wave Magnitude (Ms.) >= 5.5 have occurred over the past century in this intensely deformed, geomorphologically active area, posing potential seismic risk in the future. Combined with previous research, our findings imply that this distributed shear zone between RRF and SGF is likely affected by the basal shear from southwestward-directed, clockwise asthenospheric flow around the Eastern Himalayan Syntaxis.
Keywords:
Dayingjiang-Nantinghe region
southeastern Tibetan Plateau
geomorphic indices
tectonic activity
fault
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