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<p>The Central Yunnan Water Diversion Project traverses the Chenghai-Binchuan fault zone, a region characterized by intense Quaternary tectonic activity. Addressing the limitations in research scope and systematic analysis of this fault, this study employs 12.5&#xa0;m resolution DEM data, quantitative indices such as Hypsometric Integral (HI) and Basin Shape Index (BS), and the Stream Power Incision Model (SPIM) to analyze spatial variations in tectonic activity intensity and uplift rates. Results reveal: ① Fault activity exhibits a north-strong/south-weak segmentation pattern. The northern Jinguan (F1) and Chenghai (F2) segments show relative tectonic activity intensity indices (Iat) of 1.55 and 1.83, while the southern Maolipo-Hongyan segment (F5) has an Iat of 2.38. ② Uplift rates along the fault zone have significantly increased since ~ 4 million years ago, with a Quaternary peak of 1.0&#xa0;mm/yr in the northern Chenghai segment, consistent with low-temperature thermochronology and paleoearthquake data. ③ Tectonic factors dominate activity differentiation, with a strong correlation (R = 0.91) between seismic density and Iat values. The northern segment has a seismic density of 0.8 events/km. Although the southern part of the Binchuan segment in the central-southern region lacks historical strong earthquakes, its SLK (Standardized Stream-Length Gradient Index) ≥ 3.0 and AF (accumulated fault slip rate) ≥ 20 conform to "seismic gap" characteristics, warranting classification as a potential risk zone. This study demonstrates that integrating tectonic geomorphic parameters with uplift inversion can accurately identify active fault segments, providing quantitative insights for engineering disaster prevention and mitigation.</p>

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Study on spatial variability of tectonic activity intensity in the Chenghai-Binchuan fault zone within the Central Yunnan Water Diversion project area

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Yinghao Wei,
  • Chao Jin,
  • Xueliang Wang,
  • Shuaipo Gao,
  • Binbin Li

摘要

The Central Yunnan Water Diversion Project traverses the Chenghai-Binchuan fault zone, a region characterized by intense Quaternary tectonic activity. Addressing the limitations in research scope and systematic analysis of this fault, this study employs 12.5 m resolution DEM data, quantitative indices such as Hypsometric Integral (HI) and Basin Shape Index (BS), and the Stream Power Incision Model (SPIM) to analyze spatial variations in tectonic activity intensity and uplift rates. Results reveal: ① Fault activity exhibits a north-strong/south-weak segmentation pattern. The northern Jinguan (F1) and Chenghai (F2) segments show relative tectonic activity intensity indices (Iat) of 1.55 and 1.83, while the southern Maolipo-Hongyan segment (F5) has an Iat of 2.38. ② Uplift rates along the fault zone have significantly increased since ~ 4 million years ago, with a Quaternary peak of 1.0 mm/yr in the northern Chenghai segment, consistent with low-temperature thermochronology and paleoearthquake data. ③ Tectonic factors dominate activity differentiation, with a strong correlation (R = 0.91) between seismic density and Iat values. The northern segment has a seismic density of 0.8 events/km. Although the southern part of the Binchuan segment in the central-southern region lacks historical strong earthquakes, its SLK (Standardized Stream-Length Gradient Index) ≥ 3.0 and AF (accumulated fault slip rate) ≥ 20 conform to "seismic gap" characteristics, warranting classification as a potential risk zone. This study demonstrates that integrating tectonic geomorphic parameters with uplift inversion can accurately identify active fault segments, providing quantitative insights for engineering disaster prevention and mitigation.