Suitable triggering algorithms for detecting strong ground motions using MEMS accelerometers

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• 作者：Ravi Sankar Jakka ; Siddharth Garg
• 关键词：strong ground motion ; triggering algorithms ; seismic event detection ; MEMS accelerometers ; STA/LTA based algorithms
• 刊名：Earthquake Engineering and Engineering Vibration
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：14
• 期：1
• 页码：27-35
• 全文大小：633 KB
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• 作者单位：Ravi Sankar Jakka (1)
  Siddharth Garg (1)
  
  1. Department of Earthquake Engineering, Indian Institute of Technology, Roorkee, 247667, India
  
• 刊物类别：Engineering
• 刊物主题：Vibration, Dynamical Systems and Control
  Chinese Library of Science
  
• 出版者：Institute of Engineering Mechanics (IEM), China Earthquake Administration
• ISSN：1993-503X

文摘

With the recent development of digital Micro Electro Mechanical System (MEMS) sensors, the cost of monitoring and detecting seismic events in real time can be greatly reduced. Ability of MEMS accelerograph to record a seismic event depends upon the efficiency of triggering algorithm, apart from the sensor’s sensitivity. There are several classic triggering algorithms developed to detect seismic events, ranging from basic amplitude threshold to more sophisticated pattern recognition. Algorithms based on STA/LTA are reported to be computationally efficient for real time monitoring. In this paper, we analyzed several STA/LTA algorithms to check their efficiency and suitability using data obtained from the Quake Catcher Network (network of MEMS accelerometer stations). We found that most of the STA/LTA algorithms are suitable for use with MEMS accelerometer data to accurately detect seismic events. However, the efficiency of any particular algorithm is found to be dependent on the parameter set used (i.e., window width of STA, LTA and threshold level).