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Three-dimensional crustal P-wave velocity structure in the Yangbi and Eryuan earthquake regions, Yunnan, China 被引量:5
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作者 Jia Jia Qingju Wu Fuyun Wang 《Earthquake Science》 2021年第4期358-366,共9页
A magnitude 5.5 earthquakes occurred in Eryuan County,Dali Bai Autonomous Prefecture,Yunnan Province,China,on March 3.And a magnitude 5.0 earthquake occurred in the same place on April 17,2013,i.e.,45 days later.Then,... A magnitude 5.5 earthquakes occurred in Eryuan County,Dali Bai Autonomous Prefecture,Yunnan Province,China,on March 3.And a magnitude 5.0 earthquake occurred in the same place on April 17,2013,i.e.,45 days later.Then,on May 21,2021,multiple earthquakes,one with magnitude 6.4 and several at 5.0 or above,occurred in Yangbi County,Dali Bai Autonomous Prefecture,Yunnan Province,China.All of these occurred in the Weixi-QiaohouWeishan fault zone.In this study,1,874 seismic events in Yangbi and Eryuan counties were identified by automatic micro-seismic identification technology and the first arrivals were picked up manually.Following this,a total of 11,968 direct P-wave absolute arrivals and 73,987 high-quality Pwave relative arrivals were collected for joint inversion via the double difference tomography method.This was done to obtain the regional three-dimensional fine crustal P-wave velocity structure.The results show that the travel time residuals before and after inversion decreased from the initial–0.1–0.1 s to–0.06–0.06 s.The upper crust in the study area,which exhibited a low-velocity anomaly,corresponded to the basin region;this indicated that the low-velocity anomaly in the shallow part of the study area was affected by the basin.Results also showed some correlation between the distribution of the earthquakes and velocity structure,as there was a lowvelocity body Lv1 with a wide distribution at depths ranging from 15–20 km in the Yangbi and Eryuan earthquake regions.In addition,earthquakes occurred predominantly in the highlow velocity abnormal transition zone.The low-velocity body in the middle and lower crust may be prone to concentrating upper crustal stress,thus leading to the occurrence of earthquakes. 展开更多
关键词 Yangbi and eryuan earthquakes double difference tomography three-dimensional P-wave velocity structure Weixi-Qiaohou-Weishan fault.
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云南洱源井水温在2021年漾濞M_(S)6.4地震前的异常特征 被引量:5
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作者 马玉川 晏锐 胡小静 《地震学报》 CSCD 北大核心 2021年第5期674-677,I0002,共5页
2021年5月21日21时48分(北京时间)云南省大理白族自治州漾濞县(99.87°E,25.67°N)发生M_(S)6.4地震。该地震发生后,我们对震中附近的地下流体观测资料进行了系统的总结,结果显示云南省地震台在2021年2月24日提出洱源井水温异常... 2021年5月21日21时48分(北京时间)云南省大理白族自治州漾濞县(99.87°E,25.67°N)发生M_(S)6.4地震。该地震发生后,我们对震中附近的地下流体观测资料进行了系统的总结,结果显示云南省地震台在2021年2月24日提出洱源井水温异常,该井水温在漾濞M_(S)6.4地震前呈现明显的异常现象。 展开更多
关键词 井水温 异常特征 地震台 地下流体观测 大理白族自治州 洱源 漾濞县 异常现象
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云南洱源滇20井水位受降雨影响分析
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作者 字承柱 张立 +1 位作者 段美芳 毕树伟 《四川地震》 2019年第4期32-36,共5页
通过水化学和物理分析方法,对洱源台滇20井水位受降雨干扰进行分析,分析结果表明:井水来源主要是大气降水,井水存在一定程度的水岩作用,水位的上升受降雨影响明显。滇20井对周边地震具有一定的映震能力,地震前兆异常表现为破年变趋势上... 通过水化学和物理分析方法,对洱源台滇20井水位受降雨干扰进行分析,分析结果表明:井水来源主要是大气降水,井水存在一定程度的水岩作用,水位的上升受降雨影响明显。滇20井对周边地震具有一定的映震能力,地震前兆异常表现为破年变趋势上升异常或上升异常。 展开更多
关键词 洱源滇20井 水位 降雨
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Role of ecological approaches to eliminating schistosomiasis in Eryuan County evaluated by system modelling 被引量:5
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作者 Yi Dong Chun-Hong Du +6 位作者 Yun Zhang Li-Fang Wang Jing Song Ming-Shou Wu Wen-Can Yang Shan Lv Xiao-Nong Zhou 《Infectious Diseases of Poverty》 SCIE 2018年第1期1343-1355,共13页
Background:Schistosomiasis was severely prevalent in Yunnan Province,and it is difficult to achieve its elimination by convention approaches due to complexity of the nature.We explored the comprehensive model to elimi... Background:Schistosomiasis was severely prevalent in Yunnan Province,and it is difficult to achieve its elimination by convention approaches due to complexity of the nature.We explored the comprehensive model to eliminate schistosomiasis in Eryuan County,Yunnan Province,the People’s Republic of China,through integration with the ecological protection programme in Erhai Lake,in order to promote an efficient elimination strategy.We expected that this model is able to be tailored to other local settings,which help achieve the goal of precisely eliminating the disease in Yunnan Province.Methods:Eryuan County of Yunnan Province was chosen as the study area,where the data on environmental protection activities in Erhai Lake and on the schistosomiasis control programme were collected through different departments of Erhai County government since 2015.System modelling was performed using system dynamics software to establish a simulation model in order to evaluate the effectiveness of intervention activities.Results:Ecological approaches to control schistosomiasis in Eryuan County consist of three major components:(i)implementing precise interventions to stop schistosomiasis transmission by means of controlling the source of infection,blocking the biological transmission chains and cutting off the route of disease transmission;(ii)employing ecological approaches to improve the co-effectiveness of environmental protection and schistosomiasis prevention in the study area;and(iii)strengthening the professional skills of personnel involving in the schistosomiasis control programme.Simulation results showed that this strategy could speed up the progress of schistosomiasis control programme moving from the control stage to the elimination stage.Conclusions:Ecological approaches implemented in schistosomiasis endemic areas of the Eryuan region are able to improve the co-effectiveness of environmental protection and schistosomiasis control,providing a new avenue for eliminating schistosomiasis thanks to the application of precise interventions. 展开更多
关键词 SCHISTOSOMIASIS Ecological protection Transmission block ELIMINATION System modelling eryuan County Yunnan Province China
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Knowledge of, attitudes towards, and practice relating to schistosomiasis in two subtypes of a mountainous region of the People’s Republic of China 被引量:14
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作者 Lu Liu Guo-Jing Yang +2 位作者 Hong-Ru Zhu Kun Yang Lin Ai 《Infectious Diseases of Poverty》 SCIE 2014年第1期145-155,共11页
Background:Schistosomiasis japonica is still endemic in the People’s Republic of China(P.R.China)in five provinces of lake and marshland regions and in two provinces of mountainous regions.Studies elucidated that ind... Background:Schistosomiasis japonica is still endemic in the People’s Republic of China(P.R.China)in five provinces of lake and marshland regions and in two provinces of mountainous regions.Studies elucidated that individual and community perception,attitudes towards schistosomiasis,and hygiene behaviors were crucial factors for preventing schistosomiasis.This study sought to assess the knowledge of,attitudes towards,and practices(KAP)relating to schistosomiasis in two subtypes of a mountainous region in Eryuan County,Yunnan Province,P.R.China.The study’s aim is to make suggestions for establishing more specific and effective control measures for disease transmission and interruption in two subtypes of a mountainous region with low-level infection rates.Methods:A cross-sectional study of 3,000 inhabitants was carried out in the Yongle(plateau basin)and Xinzhuang(plateau canyon)communities of Eryuan County,Yunnan Province in November and December 2011.Stratified cluster random sampling was undertaken using a uniform set of quantitative questionnaires administered by trained assistants.This was further supported with qualitative data from in-depth interviews(IDIs)conducted with ten farmers and ten students.All participants were examined for schistosomiasis using both a serological test(indirect hemagglutination assay[IHA])and a stool examination(Kato-Katz).Results:The total schistosomiasis knowledge rate in Yongle(83.4%)was significantly lower than that in Xinzhuang(95.5%).In both communities,among the respondents aged 15 years or below,more than one third didn’t know the name,endemic areas,and animal reservoirs of schistosomiasis.The majority of respondents in Eryuan acquired their schistosomiasis knowledge from doctors,followed by handouts and hearing from others.The infection rate was once the highest in Yongle,but is now the highest in Xinzhuang,where there are more risk factors for schistosomiasis,such as frequently grazing cattle,digging vegetables or cutting grass in the field,as well as raising cattle by free grazing.Conclusion:In short,Eryuan County’s overall knowledge rate of schistosomiasis was found to be high.Due to various dominating risk factors,different control strategies should be designed keeping in mind the two different subtypes of endemic areas for schistosomiasis in mountainous regions,namely plateau basins and plateau canyons. 展开更多
关键词 SCHISTOSOMIASIS KNOWLEDGE ATTITUDE PRACTICE eryuan P.R.China
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