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http://dx.doi.org/10.9720/kseg.2013.4.353

Application of Statistical Analysis to Analyze the Spatial Distribution of Earthquake-induced Strain Data  

Kim, Bo-Ram (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Chae, Byung-Gon (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Yongje (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Seo, Yong-Seok (Department of Earth and Environmental Sciences, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.23, no.4, 2013 , pp. 353-361 More about this Journal
Abstract
To analyze the distribution of earthquake-induced strain data in rock masses, statistical analysis was performed on four-directional strain data obtained from a ground movement monitoring system installed in Korea. Strain data related to the 2011 Tohoku-oki earthquake and two aftershocks of >M7.0 in 2011 were used in x-MR control chart analysis, a type of univariate statistical analysis that can detect an abnormal distribution. The analysis revealed different dispersion times for each measurement orientation. In a more comprehensive analysis, the strain data were re-evaluated using multivariate statistical analysis (MSA) considering correlations among the various data from the different measurement orientations. $T_2$ and Q-statistics, based on principal component analysis, were used to analyze the time-series strain data in real-time. The procedures were performed with 99.9%, 99.0%, and 95.0% control limits. It is possible to use the MSA data to successfully detect an abnormal distribution caused by earthquakes because the dispersion time using the 99.9% control limit is concurrent with or earlier than that from the x-MR analysis. In addition, the dispersion using the 99.0% and 95.0% control limits detected an abnormal distribution in advance. This finding indicates the potential use of MSA for recognizing abnormal distributions of strain data.
Keywords
strain data; earthquake; x-MR control chart; principal component analysis;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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