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Research and Implementations of Structural monitoring for Bridges and Buildings in Japan

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Engineering 2019年第6期5卷 1093-1119页

作者： Yozo Fujino Dionysius MSiringoringo Yoshiki Ikeda Tomonori Nagayama Tsukasa Mizutani Institute of Advanced Sciences Yokohama National UniversityYokohama 240-8501Japan Disaster Prevention Research Institute Kyoto UniversityKyoto 611-0011Japan Department of Civil Engineering The University of TokyoTokyo 113-8656Japan

This paper provides a review on the development of structural monitoring in Japan, with an emphasis on the type, strategy, and utilization of monitoring systems. The review focuses on bridge and building structures using vibration-based techniques. Structural monitoring systems in Japan historically started with the objective of evaluating structural responses against extreme events. In the development of structural monitoring, monitoring systems and collected data were used to verify design assumptions, update speci cations, and facilitate the ef cacy of vibration control systems. Strategies and case studies on monitoring for the design veri cation of long-span bridges and tall buildings, the performance of seismic isolation systems in building and bridges, the veri cation of structural retro t, the veri cation of structural control systems (passive, semi-active, and active), structural assessment, and damage detec- tion are described. More recently, the application of monitoring systems has been extended to facilitate ef cient operation and effective maintenance through the rationalization of risk and asset management using monitoring data. This paper also summarizes the lessons learned and feedback obtained from case studies on the structural monitoring of bridges and buildings in Japan.

关键词： Structural monitoring Long-span bridge High-rise building seismic monitoring Wind-induced responses Pavement and slab monitoring Structural control monitoring Structural assessment

Rockfall localization from seismic polarization considering multiple triaxial geophones and frequency bands

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Journal of Mountain Science 2020年第7期17卷 1541-1552页

作者： Liang FENG Veronica PAZZI Emanuele INTRIERI Teresa GRACCHI Giovanni GIGLI Grazia TUCCI Department of Earth Sciences University of FlorenceVia G.La Pira 450121FlorenceItaly Department of Civil and Environment Engineering University of FlorenceVia Santa Marta 350139FlorenceItaly

Boulder/rock mass movements generate ground vibrations that can be recorded by geophone ***,there are two methods applied to rockfall trajectory reconstruction or rockfall seismic *** method uses seismic wave arrival times and is achieved by minimizing the differences in signal arrival times between multiple stations by grid map *** other method uses seismic polarization and is achieved by calculating eventsource back azimuths from the seismic polarizations of rockfall *** this study,we proposed the use of an overdetermined matrix for joint localization based on the polarization *** overdetermined matrix considers the contributions of all geophones in the network,and at each geophone is assigned a different weight according to the recorded signal qualities and the reliability of the calibrated back *** method shows a great advantage relative to the case in which only two sensors are ***,we suggested three marker parameters for proper frequency band selection in back azimuth calculations:energy,rectilinearity,and a special permanent frequency band(SPF).We found that the back azimuths calculated with energy and an SPF are generally close to the real back azimuths measured in the field,while the SPF is limited by seismic attenuation due to a long-distance *** localization results of rockfalls were validated by using field camera videos and in situ *** typical cases and 43 artificially released rockfalls are presented in this *** proposed method provides an interesting way to locate rockfall events and track rockfall trajectories and avoids the difficulties of obtaining accurate arrival times,as required by the arrival times method.

关键词： Rockfall Localization seismic polarization seismic monitoring Early warning

Development of a new high resolution waveform migration location method and its applications to induced seismicity

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Earth and Planetary Physics 2021年第6期5卷 520-531页

作者： SiYu Miao HaiJiang Zhang YuYang Tan Ye Lin Laboratory of Seismology and Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaHefei 230026China Key Lab of Submarine Geosciences and Prospecting Techniques MOE Institute for Advanced Ocean StudyOcean University of ChinaQingdao 266100China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266100China

Locating seismic events is a central task for earthquake *** to arrival-based location methods,waveformbased location methods do not require picking phase arrivals and are more suitable for locating seismic events with noisy *** waveform-based location methods,one approach is to stack different attributes of P and S waveforms around arrival times corresponding to potential event locations and origin times,and the maximum stacking values are assumed to indicate the correct event location and origin *** this study,to obtain a high-resolution location image,we improve the waveform-based location method by applying a hybrid multiplicative imaging condition to characteristic functions of seismic *** our new stacking method,stations are divided into groups;characteristic functions of seismic waveforms recorded at stations in the same group are summed,and then multiplied among *** find that this approach can largely eliminate the cumulative effects of noise in the summation process and thus improve the resolution of location *** test the new method and compare it to three other stacking methods,using both synthetic and real datasets that are related to induced seismicity occurring in petroleum/gas *** test results confirm that the new stacking method can provide higher-resolution location images than those derived from currently used methods.

关键词： induced earthquake seismic location seismic monitoring

Architecture and critical technologies of seismic information system in CTBT verifi-cation

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Acta Seismologica Sinica(English Edition) 2006年第5期19卷 588-595页

作者：郑学锋沈钧毅靳平郑江铃孙鹏张慧民王同东 Xi'an Jiao Tong University Northwest Institute of Nuclear Technology Xi'an 710024China Northwest Institute of Nuclear Technology

seismic monitoring is one of the most important approaches for ground-based nuclear explosion monitoring. In order to improve the monitoring capability for low magnitude seismic events, a seismic information system was developed by using the technologies of geographic information system and database. This paper describes the designing and critical technologies of the seismic Information System in CTBT Verification developed based on ArcGIS and ORACLE platforms. It is a combination of the database storage framework, application programming interface and graphic application software for users to meet their monitoring objectives. Combining the ArcSDE Geodatabase, RDBMS ORACLE and ArcObjects developing technique on COM, not only the multi-sources data has been seamlessly integrated, but also the most functions of ORACLE, for example, consistency, concurrent access, security mechanism, etc, have been reserved. For easy access to the information system we develop two different mechanisms. The first is a menu-driven internal system that is run on NT platforms. The second access mechanism is based on LAN and easily accessible by any web browsers.

关键词： seismic monitoring CTBT databases nuclear explosion monitoring GIS

Development of China Digital Seismological Observational Systems

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Acta Seismologica Sinica(English Edition) 2003年第5期16卷 568-573页

作者：刘瑞丰吴忠良阴朝民陈运泰庄灿涛 Institute of Geophysics China Seismological Bureau China Seismological Bureau Center for Analysisand Prediction China Seismological Bureau

Development of China Digital Seismological Observational Systems during 1996~2000 and the Capital Circle Area Seismograph Network during 1999~2001 are introduced, and the station distributions, instruments used, main tasks of National Digital Seismograph Network, Regional Digital Seismograph Network and Portable Digital Seismograph Network are introduced chiefly.

关键词： digital seismograph network broad-band seismic monitoring

Satellite detection of IR precursors using bi-angular advanced along-track scanning radiometer data:a case study of Yushu earthquake

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Earthquake Science 2015年第1期28卷 25-36页

作者： Pan Xiong Xuhui Shen Xingfa Gu Qingyan Meng Yaxin Bi Liming Zhao Yanhua Zhao Yan Li Jianting Dong Institute of Earthquake Science China Earthquake Administration Intitute of Remote Sensing Applications and Digital Earth Chinese Academy of Sciences School of Computing and Mathematics University of UlsterNewtownabbey Co. Beijing Institute of Space Mechanics and Electricity

The paper has developed and proposed a syn- thesis analysis method based on the robust satellite data analysis technique （RST） to detect seismic anomalies within the bi-angular advanced along-track scanning ra- diometer （AATSR） gridded brightness temperature （BT） data based on spatial/temporal continuity analysis. The proposed methods have been applied to analyze the Yushu （Qinghai, China） earthquake occurred on 14th April 2010, and a full AATSR data-set of 8 years data from March 2003 to May 2010 with longitude from 91~E to 101°E and latitude from 28°N to 38°N has been analyzed. Combining with the tectonic explanation of spatial and temporal continuity of the abnormal phenomena, the analyzed results indicate that the infrared radiation anomalies detected by the AATSR BT data with nadir view appear and enhance gradually along with the development and occurring of the earthquake, especially along the Ganzi-Yushu fault, Nu River fault and Jiali-Chayu fault; more infrared anomalies along the earthquake fault zone （Lancangjiang fault and Ning Karma Monastery-Deqin fault） are detected using the proposed synthesis analysis method, which can also characterize the activity of seismic faults more precisely.

关键词： seismic monitoring Infrared multi-angleEarthquake infrared radiation anomalies

Analysis of injection-induced failure for DuPont test 1#, Dongying, Shandong Prov-ince

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Acta Seismologica Sinica(English Edition) 2007年第3期20卷 290-301页

作者：李行船郭飚曲国胜刘启元李顺成陈九辉李岩峰谢晓峰 Institute of Geology China Earthquake Administration National Earthquake Response Support Service

From December 3, 2005 to May 18, 2006, a water injection-induced seismicity test was conducted on DuPont test well 1# for about six months by China Earthquake Administration. To the vertical injected well, 11 water injection processes were conducted on four depth intervals, including middle Shahejie3, the top of the upper Shahejie3, the bottom of the upper Shahejie3 and Shahejie2, with the vertical span from 1464 m to 3 034 m. monitoring stations has been run throughout the procedure. From the recorded data, there were 5 090 events being picked out manually, 274 events located. It indicates that the energy of seismic signal is very small, and the largest magnitude is no more than ML0.5. And also, the major energy is centered on the vertical component, while amplitude of the other horizontal components is very small. From the start of water injection, the number of seismic events varied with time. And the event was most frequent in the period of upper Shahejie3 injection. The distribution of events extended from the injected well to the outside with time, and the direction of events distribution rotated in different injected interval. Of which, in the low permeability interval, events trend close to the direction of principal compressive stress direction; while in higher permeability interval, they trend close to the predominant seepage direction.

关键词： injection-induced seismicity formation failure seismic monitoring earthquake location

Clock Jump Repair of high-rate GNSS data for earthquake monitoring in Japan

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Clock Jump Repair of high-rate GNSS data for earthquake moni...