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Spatial Distribution of Seismic Landslides in the Areas of 1927 Gulang M8.0 Earthquake
XU Jixiang1,2, XU Chong1,3, HE Xiangli3, WEN Boyu1,2, GE Keshui2, BAI Yuzhu1
1.Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2.School of Engineering and Technology, China University Of Geosciences(Beijing), Beijing 100083, China;3.Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
摘要:
The 1927 Gulang M8.0 earthquake has triggered a huge number of landslides, resulting in massive loss of people's life and property. However, integrated investigations and results regarding the landslides triggered by this earthquake are rare; such situation hinders the deep understanding of these landslides such as scale, extent, and distribution. With the support of Google Earth software, this study intends to finish the seismic landslides interpretation work in the areas of Gulang earthquake (VIII-XI degree) using the artificial visual interpretation method, and further analyze the spatial distribution and impact factors of these landslides. The results show that the earthquake has triggered at least 936 landslides in the VIII-XI degree zone, with a total landslide area of 58.6 km2. The dense area of seismic landslides is located in the middle and southern parts of the X intensity circle. Statistical analysis shows that seismic landslides is mainly controlled by factors such as elevation, slope gradient, slope direction, strata, seismic intensity, faults and rivers. The elevation of 2 000-2 800 m is the high-incidence interval of the landslide. The landslide density is larger with a higher slope gradient. East and west directions are the dominant sliding directions. The areas with Cretaceous and Quaternary strata are the main areas of the Gulang seismic landslides. The X intensity zone triggered the most landslides. In addition, landslides often occur in regions near rivers and faults. This paper provides a scientific reference for exploring the development regularities of landslides triggered by the 1927 Gulang earthquake and effectively mitigating the landslide disasters of the earthquake.
关键词:  Gulang earthquake  Landslide  Google Earth  Artificial visual interpretation  Spatial distribution
DOI:10.19743/j.cnki.0891-4176.202001002
分类号:
基金项目:This project was sponsored by the the National key Research and Development Program of China(2018FYC1504703),Basic Scientific Fund of the Institute of Geology, China Earthquake Administration (IGCEA1604) and the National Natural Science Foundation of China (41661144037).
Spatial Distribution of Seismic Landslides in the Areas of 1927 Gulang M8.0 Earthquake
XU Jixiang1,2, XU Chong1,3, HE Xiangli3, WEN Boyu1,2, GE Keshui2, BAI Yuzhu1
1.Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2.School of Engineering and Technology, China University Of Geosciences(Beijing), Beijing 100083, China;3.Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
Abstract:
The 1927 Gulang M8.0 earthquake has triggered a huge number of landslides, resulting in massive loss of people's life and property. However, integrated investigations and results regarding the landslides triggered by this earthquake are rare; such situation hinders the deep understanding of these landslides such as scale, extent, and distribution. With the support of Google Earth software, this study intends to finish the seismic landslides interpretation work in the areas of Gulang earthquake (VIII-XI degree) using the artificial visual interpretation method, and further analyze the spatial distribution and impact factors of these landslides. The results show that the earthquake has triggered at least 936 landslides in the VIII-XI degree zone, with a total landslide area of 58.6 km2. The dense area of seismic landslides is located in the middle and southern parts of the X intensity circle. Statistical analysis shows that seismic landslides is mainly controlled by factors such as elevation, slope gradient, slope direction, strata, seismic intensity, faults and rivers. The elevation of 2 000-2 800 m is the high-incidence interval of the landslide. The landslide density is larger with a higher slope gradient. East and west directions are the dominant sliding directions. The areas with Cretaceous and Quaternary strata are the main areas of the Gulang seismic landslides. The X intensity zone triggered the most landslides. In addition, landslides often occur in regions near rivers and faults. This paper provides a scientific reference for exploring the development regularities of landslides triggered by the 1927 Gulang earthquake and effectively mitigating the landslide disasters of the earthquake.
Key words:  Gulang earthquake  Landslide  Google Earth  Artificial visual interpretation  Spatial distribution