检索结果-南通市图书馆

Recent advances in earthquake monitoring I:Ongoing revolution of seismic instrumentation

在线全文

学校读者我要写书评

暂无评论

earthquake Science 2021年第2期34卷 177-188页

作者： Zefeng Li Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaMengcheng233500China

Seismic networks have significantly improved in the last decade in terms of coverage density,data quality,and instrumental ***,revolutionary advances in ultra-dense seismic instruments,such as nodes and fiber-optic sensing technologies,have recently provided unprecedented high-resolution data for regional and local earthquake *** arrays have characteristics such as easy installation and flexible apertures,but are limited in power efficiency and data storage and thus most suitable as temporary ***-optic sensing techniques,including distributed acoustic sensing,can be operated in real time with an in-house power supply and connected data storage,thereby exhibiting the potential of becoming next-generation permanent ***-optic sensing techniques offer a powerful way of filling the observation gap particularly in submarine *** these technological advancements,various challenges ***,the data characteristics of fiber-optic sensing are still ***,it is challenging to construct software infrastructures to store,transfer,visualize,and process large amount of seismic ***,innovative detection methods are required to exploit the potential of numerous *** improved knowledge about data characteristics,enhanced software infrastructures,and suitable data processing techniques,these innovations in seismic instrumentation could profoundly impact observational seismology.

关键词： earthquake monitoring seismic instrumentation dense array distributed acoustic sensing.

Research on geo-electrical resistivity observation system specially used for earthquake monitoring in China

在线全文

学校读者我要写书评

暂无评论

earthquake Science 2011年第6期24卷 497-511页

作者： Jialiu Zhao Lanwei Wang Jiadong Qian Institute of earthquake Science China Earthquake Administration Beijing 100036 China Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China

This paper deals with the design and development of the observational system of geo-electrical resistivity on the basis of the demands for exploring the temporal variations of electrical properties of Earth media in the fixed points of the networks, which would be associated with the earthquake preparation. The observation system is characterized by the high accuracy in measurement, long term stability in operation and high level of rejection to the environmental interference. It consists of three main parts, configuration system measurement system, the calibration and inspection system.

关键词： geo-electrical resistivity observation system earthquake monitoring configuration system measurement system calibration and inspection system

monitoring seismicity in the southern Sichuan Basin using a machine learning workflow

在线全文

学校读者我要写书评

暂无评论

earthquake Research Advances 2024年第1期4卷 59-66页

作者： Kang Wang Jie Zhang Ji Zhang Zhangyu Wang Huiyu Zhu School of Earth and Space Sciences University of Science and Technology of ChinaHefei230026China

monitoring seismicity in real time provides significant benefits for timely earthquake warning and *** this study,we propose an automatic workflow based on machine learning(ML)to monitor seismicity in the southern Sichuan Basin of *** workflow includes coherent event detection,phase picking,and earthquake location using three-component data from a seismic *** combining Phase Net,we develop an ML-based earthquake location model called Phase Loc,to conduct real-time monitoring of the local *** approach allows us to use synthetic samples covering the entire study area to train Phase Loc,addressing the problems of insufficient data samples,imbalanced data distribution,and unreliable labels when training with observed *** apply the trained model to observed data recorded in the southern Sichuan Basin,China,between September 2018 and March *** results show that the average differences in latitude,longitude,and depth are 5.7 km,6.1 km,and 2 km,respectively,compared to the reference *** Loc combines all available phase information to make fast and reliable predictions,even if only a few phases are detected and *** proposed workflow may help real-time seismic monitoring in other regions as well.

关键词： earthquake monitoring Machine learning Local seismicity Gaussian waveform Sparse stations

earthquake Emergency Response System of High-speed Railway by Least Square Method

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2023年第2期30卷 1-11页

作者： Qizhou Hu Yikai Wu School of Automation Nanjing University of Science and TechnologyNanjing 210094China

This paper studies the Least Square Method to define high-speed railway(HSR) earthquake risk and solve the problem of its emergency response mechanism. Based on the construction of a monitoring system for HSR earthquake emergency response, the technical operational procedures for HSR seismic emergency response are proposed. The quantity, scale, and location of HSR earthquake emergency response mechanism are defined, and the corresponding emergency response system is built. In particular, the earthquake emergency response system can conduct real-time continuous dynamic monitoring of seismic activity along the railway. When earthquake occurs, the intensity of the ground motion is detected by the system. When the earthquake monitoring value reaches the earthquake alarm threshold, it will send an alarm signal to the dispatch center, and the emergency power supply will be forced to cut off. The earthquake emergency response system will continue to monitor the follow-up ground motion acceleration. The system provides the operation scheduling center with a basis for train operation control to resume operation after stopping. The monitoring result of the system reduces the disaster, and the secondary disaster is caused by the earthquake. This paper improves the HSR response mechanism in detecting earthquake disasters. The result improves the ability of HSR to deal with earthquake disasters, and reduces casualties and economic and property loss caused by earthquake disasters.

关键词： high-speed railway(HSR) earthquake monitoring emergency response mechanism

Aqueous Chemistry of Typical Geothermal Springs with Deep Faults in Xinyi and Fengshun in Guangdong Province,China

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2015年第1期26卷 60-72页

作者： Guoping Lu Runfang Liu State Key Laboratory of Biogeology and Environmental Geology School of Environmental StudiesChina University of Geosciences

This paper investigated aqueous chemistry for two geothermal spring groups responsive and sensitive to flow fluctuations induced by earthquakes. Quake monitorings are favored for their being in residential areas with well-preserved natural flow systems in Xinyi City＇s Xijiang Hot Springs and Fengshun County＇s Shihu Hot Spring. The hot springs are typical in temperatures and flow rates in southern China＇s Guangdong Province. Physical and chemical conditions deep down in the heat sources are important constraints on earthquake, fluid flow, reactive solute transport and heat transfer, but remain challenging to address via field observations and numerical experiments. In this paper, we made daily and annual observations on flow rates, temperature, and/or aqueous chemistry. We employed strontium isotopes as tracers for the water sources, equilibrium phase diagram for K-feldspar and albite stability, and Na-K-Mg diagram for heat reservoir temperatures. The abundant sulfite content in Xi- jiang Hot Springs is discussed. Our main finding are that the deep fault springs are characterized by low reduction-oxidation potential at around -200- -150 mV and relatively large daily flow variations. The resuits provide scientific background features on the field sites regarding earthquake monitoring and predictions and geothermal reservoir.

关键词： geothermal hot spring aqueous geochemistry earthquake monitoring geothermal reservoir temperature reduction oxidation potential Xinyi Fengshun.

Comprehensive Studies of Seismic Forecast and Seismic Hazard Assessment in Armenia, Current State and Prospects

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2021年第S1期95卷 55-58页

作者： Karapetyan JON LI Li Institute of Geophysics and Engineering Seismology named after A.Nazarov NAS RAGyumri3115Armenia Institute of Geophysics CEABeijing100081China

The study of geophysical processes in different layers of the Earth,seismic hazard assessment,earthquake prediction,*** topical fundamental and applied *** development of a modern adequate methodology for assessing se... 详细信息

关键词： seismic hazard assessment earthquake prediction earthquake monitoring Earth crust

Applications of seismic moment tensor inversion in fast response to earthquakes

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 1999年第2期12卷 129-136页

作者：刘瑞丰陈运泰周公威涂毅敏陈培善 Institute of Geophysics China Seismological Bureau Beijing China

Using the technique of seismic moment tensor inversion, the source mechanisms of 10 earthquakes with Ms5.2that occurred in China from November 1996 to January 1998 were determined rapidly. The determined resultswere sent as 'Bulletins of Source Mechanism Parameters of earthquakes' to the Seismic Regime Guards' Office,China Seismological Bureau, and the relevant provincial seismological bureaus. These bulletins have played rolein the fast response to large earthquakes.

关键词： seismic moment tensor inversion seismic source mechanism fault plane solution earthquake monitoring

Introduction to China’s earthquake Emergency Response System

在线全文

学校读者我要写书评

暂无评论

earthquake Science 2021年第5期34卷 447-459页

作者： Jianhong Liang Nan Xi Jie Liu Jingqiong Yang Hongbo Shi Zhigao Yang China earthquake Networks Center(CENC) Beijing 100045China Yunnan earthquake Agency Kunming 650201China

Following the M_(S)6.4 earthquake that occurred on May 21,2021 in Yangbi,Yunnan,China,the earthquake emergency response system(EERS)responded *** real-time software delivered many seismic parameters that provided a preliminary assessment of the *** 24-hour on-duty staff and scientific researchers revised these parameters and produced more detailed reports to understand the cause of the earthquake and the potential damage,which provided valuable information for emergency rescue operations and earthquake situation *** personnel were dispatched immedia-tely to the earthquake site to observe the aftershocks,investigate the damage,and guide and assist in the relief *** paper describes the EERS response to the Yangbi earthquake to demonstrate the characteristics of the system and discuss the potential for further improvement.

关键词： emergency response system earthquake monitoring emergency product automatic revision

The Statistical Relationship between the Maximum Amplitude of the Body Strain Record and the Surface-wave Magnitude and Epicenter Distance

在线全文

学校读者我要写书评

暂无评论

earthquake Research in China 2017年第1期31卷 107-115页

作者： Jiang Jianing Wu Lijun Zhangjiakou Central Station Earthquake Administration of Hebei Province Institute of earthquake Science China Earthquake Administration

Based on the body strain record of Tiantanghe station from 2008 to 2014,we make a statistical analysis of the relationship between the maximum amplitude of the body strain record and the surface-wave magnitude,epicenter distance of the earthquakes,which occurred in the Chinese mainland and its surrounding areas with MS≥6. 0 and the rest of the world with MS≥7. 0. According to statistical results,we propose a statistical formula between the surface-wave magnitude of earthquake and the maximum amplitude of the body strain record,the epicenter distance: M_S~*= 0. 37 ln A_max+ 0. 57 ln D + 0. 07. We can also derive a theoretical estimation formula for the maximum amplitude: A_max=e^(2. 7(M_S^*-0. 07))D^(-1. 54). This demonstrates that the maximum amplitude of the body strain record increases exponentially with the increase of the surface-wave magnitude, and decreases with the increase of the epicenter distance,and shows a negative correlation with their product. We further discuss the necessity of adding instruments with high frequency sampling to earthquake monitoring, and dicuss the prospects for precise earthquake prediction in future.

关键词： Body strain Seismic wave Statistical analysis High sampling rate earthquake monitoring earthquake prediction