Time Series Analysis for Detecting Changes of Ground Water Level due to Earthquake at Hamaoka Observation Well, Shizuoka Prefecture, Central Japan

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Other Title
  • 地震にともなう地下水位変化検出のための時系列解析
  • 地震にともなう地下水位変化検出のための時系列解析--静岡県浜岡観測井への適用
  • ジシン ニ トモナウ チカ スイイ ヘンカ ケンシュツ ノ タメ ノ ジケイレ
  • ―静岡県浜岡観測井への適用―

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Abstract

Multiple regression and autoregression analyses are applied to the ground water level observed at Hamaoka observation well, Shizuoka Prefecture, central Japan for the purpose of detecting anomalous changes of the water level due to earthquakes. These analyses can eliminate barometric response, tidal response and response due to precipitation from the observed water level. During the period from April 1983 to March 1992, a change of corrected water level is detected just after Western Nagano Prefecture Earthquake that occurred on September 14th, 1984. This anomalous change is the only coseismic change detected at Hamaoka well. Whereas, thirteen coseismic fluctuations of the corrected water level are detected during the same observation period at Haibara well about 20km north of Hamaoka well. Because a aquifer observed at Hamaoka well is less confined than that at Haibara well, the corrected water level at Hamaoka well is less sensitive to earthquakes than that at Haibara. The corrected water level at Hamaoka well is compared to volumetric strainmeter of Japan Meteorological Agency at Hamaoka, 150m northwest of the Hamaoka well. The strainmeter is changed only after the Western Nagano Prefecture Earthquake during April 1983 to October 1991. The change of corrected water level at Hamaoka well is thought to express strain nearby the well.

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