Dynamic response characteristics of sites with different genesis earth fissure in the Hebei Plain and Su-Xi-Chang region of China
Ge Cao,Yahong Deng,Huandong Mu,Jiang Chang,You Xuan,Dexin Niu
Abstract
Determining the dynamic response characteristics of earth fissure sites is crucial for disaster prevention and mitigation. However, systematic comparisons of dynamic amplification effects among various genesis fissure sites remain scarce, limiting the development of targeted seismic fortification strategies. This study investigates typical tectonic, seismic, and bedrock buried hill-type earth fissures from the Hebei Plain and Su-Xi-Chang region in China. Based on microtremor tests at 12 representative fissures (comprising 180 measurement points) and Hilbert-Huang transform analysis, we systematically characterized and compared the dynamic amplification effects of different fissure types. Results demonstrate that all fissure types significantly amplify the dynamic response of sites, but with notable differences in amplification magnitude, decay rate, and influence range. The hanging sides of tectonic fissures exhibit the highest amplification factors proximal to the fissures, showing the most pronounced "hanging side effect," which is present but less prominent in seismic and bedrock hill-type sites. The amplification effect of bedrock hill earth fissures influences the widest area (~20 m on both sides), approximately double the range of tectonic and seismic fissures. Based on amplification factor thresholds, we classified influence zones into high (amplification factor greater than 1.5), medium (1.1 to 1.5), and low (less than 1.1) hazard zones. Corresponding seismic fortification measures are recommended, including increasing the design basis seismic acceleration by 2.0 and 1.5 times for structures in high and medium hazard zones, respectively. This study provides the first systematic comparison of dynamic response characteristics across different genesis earth fissures, offering a scientific basis for the seismic fortification of similar sites.
Ge Cao — 1) Exploration and Development Research Institute, PetroChina Changqing Oilfield Company, Xi'an 710018, China, 2) National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China
Yahong Deng — 1) School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China, 2) Key Laboratory of Mine Geological Hazards Mechanism and Control, Ministry of Natural Resources, Xi'an 710054, China
Huandong Mu — Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China
Jiang Chang — China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, China
You Xuan, Dexin Niu — School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China
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