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Science China Earth Sciences 2017年第12期60卷 2181-2189页

作者： SHAN Bin ZHENG Yong LIU ChengLi XIE ZuJun KONG Jun Hubei Subsurface Multi-scale Imaging Key Laboratory Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China Sichuan earthquake Administration Chengdu 610041China

On August 8, 2017, a M7.0 earthquake occurred in jiuzhaigou County, Sichuan Province, China, resulting in significant casualties and property damage. Therefore, it is critical to identify the areas of potential aftershocks before reconstruction and re-settling people to avoid future disasters. Based on the elastic dislocation theory and a multi-layered lithospheric model, we calculate the Coulomb failure stress changes caused by the Wenchuan and Jiuzhaigou earthquakes, discuss the relationship between the Mw7.9 Wenchuan and M7.0 Jiuzhaigou earthquakes, and analyze the influence of the aftershock distribution and stress changes on the major faults in this region caused by the Jiuzhaigou earthquake. The co-and post-seismic stress changes caused by the Wenchuan earthquake significantly increased the stress accumulation at the hypocenter of the Jiuzhaigou earthquake. Therefore,the occurrence of the Jiuzhaigou earthquake was probably stimulated by the Wenchuan earthquake. The aftershock distribution is well explained by the co-seismic stress changes of the Jiuzhaigou earthquake. The stress accumulation and corresponding seismic hazard on the Maqu-Heye segment of the East Kunlun fault and the northern extremity of the Huya fault has been further increased by the Jiuzhaigou earthquake.

关键词： Jiuzhaigou earthquake Wenchuan earthquake Seismic hazard Coulomb failure stress

Stress drop assessment of the August 8, 2017, Jiuzhaigou earthquake sequence and its tectonic implications

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earthquake Science 2020年第4期33卷 161-176页

作者： Xi He Lian-Feng Zhao Xiao-Bi Xie Lin Shen Wei-Min Wang Zhen-Xing Yao Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics^Chinese Academy of SciencesBeijing 100029China Institute of Geophysics and Planetary Physics University of California at Santa CruzCA 95064USA Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

By using a broadband Lg attenuation model developed for the Tibetan Plateau,we isolate source terms by removing attenuation and site effects from the observed Lg-wave displacement spectra of the M 7.0 earthquake that occurred on August 8,2017,in jiuzhaigou,China,and its aftershock sequence.Thus,the source parameters,including the scalar seismic moment,comer frequency and stress drop,of these events can be further estimated.The estimated stress drops vary from 47.1 kPa to 7149.6 kPa,with a median value of 59.4 kPa and most values falling between 50 kPa and 75 kPa.The estimated stress drops show significant spatial variations.Lower stress drops were mainly found close to the mainshock and on the seismogenic fault plane with large coseismic slip.In contrast,the highest stress drop was 7.1 MPa for the mainshock,and relatively large stress drops were also found for aftershocks away from the major seismogenic fault and at depths deeper than the zone with large coseismic slip.By using a statistical method,we found self-similarity among some of the aftershocks with a nearly constant stress drop.In contrast,the stress drop increased with the seismic moment for other aftershocks.The amount of stress released during earthquakes is a fundamental characteristic of the earthquake rupture process.As such,the stress drop represents a key parameter for improving our understanding of earthquake source physics.

关键词： scalar seismic moment comer frequency stress drop Lg attenuation Jiuzhaigou earthquake

活态遗产“延续性”的灾后识别与保护——以中国九寨沟传统聚落震后重建为例

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China City Planning Review 2022年第4期31卷 17-27页

作者：李骥刘弘涛丹尼斯·伊基兹·卡娅 School of Architecture Southwest Jiaotong UniversityChengduP.R.China Department of the Built Environment Eindhoven University of Technology(TU/e)

The living heritage approach seeks to link heritage properties with the living dimensions attributed by local communities–tangible and intangible heritage.However,how living heritage can be further understood and managed in post-disaster traditional settlements has yet to be explored adequately.This paper discusses the concept of living heritage embedded in post-earthquake planning and reconstruction of traditional settlements in jiuzhaigou Valley,a World Heritage property in Sichuan Province.The thematic analysis method is employed to conduct both deductive and inductive content analysis of governmental administrative documents on post-earthquake reconstruction policies and practices.The results demonstrate that the continuity of heritage and the continuity of community are the two essential attributes conceptualizing living heritage by developing a people-centered approach to resilience-building in post-disaster traditional settlements.The paper broadens the concept of living heritage by incorporating the discussion of heritage and traditional settlements into a post-disaster context.The living heritage approach can be further elaborated into an integrated heritage management approach relying on community values and empowerment,to promote urban and rural conservation and urbanization policy-making and practices worldwide.

关键词： living heritage post-disaster ethnic minority traditional settlements Jiuzhaigou earthquake

Qualitative Analyses of Correlations between Strong Ground Motions of the Three Large earthquakes and Landslide Distributions

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Journal of Earth Science 2023年第2期34卷 369-380页

作者： Yuzhu Bai Chong Xu Institute of Geology China Earthquake AdministrationBeijing 100029China National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of ChinaBeijing 100085China

In this work,the correlations between spatial distributions of landslide point density(LPD)and strong ground motions of the three strong earthquakes are qualitatively investigated.Meanwhile the qualitative relationship between the distribution of LPD and the fault rupture process is also characterized.Three strong events are the Lushan,Wenchuan,and Jiuzhaigou earthquakes.In order to reconstruct the near filed strong ground motions and the fault processes of these earthquakes,the broadband ground simulation method of University of California Santa Barbara(UCSB)and the simplified crustal layer structures are applied.To show the rationality of the UCSB method,the fault slip distributions of the three earthquakes reconstructed by the kinematic rupture generator model in the UCSB method are compared with those by inversed.Furthermore,the validation of the UCSB method for the three earthquakes is also carried according to the validation exercise of the Southern California earthquake Center(SCEC)Broadband Platform(BBP).Lastly,the fields of peak ground acceleration(PGA)and peak ground velocity(PGV)in three mutually perpendicular directions of the three earthquakes are achieved.Generally,the landslide distribution length of large LPD values along the fault strike is less than the fault strike length.Therefore,the slip modes of earthquake faults affect the distributions of landslides.For the strike slip earthquakes,the distributions of large LPD values relate well to PGA and PGV components of the parallel and normal to the fault strike.For the reverse slip earthquakes,distributions of LPD relate to ground motion components in all directions.Moreover,distributions of landslides in near fields of earthquakes are significantly affected by the focus parameters and fault scales.

关键词： Lushan earthquake Wenchuan earthquake Jiuzhaigou earthquake landslide ground motions engineering geology

The qualitative analyses of correlations between strong ground motions of the three large earthquakes and landslide distributions

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Journal of Earth Science 2021年

作者： Yuzhu Bai Chong Xu Institute of Geology China earthquake Administration

In this work， the correlations between spatial distributions of landslide point density (LPD) and strong ground motions of the three strong earthquakes are qualitatively investigated. Meanwhile the qualitative relationship between the distribution of LPD and the fault rupture process is also characterized. Three strong events are the Lushan， Wenchuan， and Jiuzhaigou earthquakes. In order to reconstruct the near filed strong ground motions and the fault processes of these earthquakes， the broadband ground simulation method of University of California Santa Barbara (UCSB) and the simplified crustal layer structures are applied. To show the rationality of the UCSB method， the fault slip distributions of the three earthquakes reconstructed by the kinematic rupture generator model in the UCSB method are compared with those by inversed. Furthermore， the validation of the UCSB method for the three earthquakes is also carried according to the validation exercise of the Southern California earthquake Center (SCEC) Broadband Platform (BBP). Lastly， the fields of peak ground acceleration (PGA) and peak ground velocity (PGV) in three mutually perpendicular directions of the three earthquakes are achieved. Generally， the landslide distribution length of large LPD values along the fault strike is less than the fault strike length. Therefore， the slip modes of earthquake faults affect the distributions of landslides. For the strike slip earthquakes， the distributions of large LPD values relate well to PGA and PGV components of the parallel and normal to the fault strike. For the reverse slip earthquakes， distributions of LPD relate to ground motion components in all directions. Moreover， distributions of landslides in near fields of earthquakes are significantly affected by the focus parameters and fault scales.

关键词： Lushan earthquake Wenchuan earthquake Jiuzhaigou earthquake Landslide Ground motions