水平動地震計特性の違いが地下構造推定に与える影響

DOI Web Site Web Site 参考文献13件

書誌事項

タイトル別名
  • Effect on the Subsurface Structure Estimation by the Difference in Responses of Two Horizontal Component Seismographs
  • スイヘイドウ ジシンケイ トクセイ ノ チガイ ガ チカ コウゾウ スイテイ ニ アタエル エイキョウ
公開日
2018-11-10
資源種別
journal article
DOI
  • 10.4294/zisin.2018-1
公開者
公益社団法人 日本地震学会

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説明

<p>Receiver function analysis is an effective method to estimate subsurface structure beneath a seismograph. To apply this method, responses of all three components of a seismograph should be almost the same. However, due to various observation conditions and/or deterioration of the sensors, the response of each component tends to differ. To check the effects of the differences in the sensor response between each component to the receiver function analysis results, we investigated the teleseismograms observed at the N.TSMH station of NIED Hi-net as an example. At this station, the NS component showed a lower response than the other components for frequency ranges lower than 1 Hz. As this feature was resolved after seismograph replacement, we set two analysis periods, before and after the seismograph replacement. Comparing backazimuth dependence of the receiver functions, we first confirmed that the Ps converted phase amplitudes were slightly smaller in specific directions before the replacement than those after replacement. However, there were no clear differences for the arrival times of these phases. Next, we applied the harmonic decomposition analysis to two datasets and estimated the plunge azimuth of the subducting oceanic Moho beneath the station. To evaluate the stability of the estimation results, 1000-time bootstrap tests were conducted for each dataset. Using the dataset before the replacement, the results showed that the oceanic Moho dipped to the west. Based on the dataset after the replacement, the estimated plunge azimuth was in the west-northwest direction. Previous studies show the slab might be inclined to the northwest or west-northwest direction beneath the Bungo channel. This means that the dataset before the replacement was inconsistent with the previous results because of the lower response of the NS component.</p>

収録刊行物

  • 地震　第２輯

    地震　第２輯 71 (0), 121-130, 2018-11-10

    公益社団法人 日本地震学会

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