<紀要論文>
1995年奄美大島近海地震余震の喜界島における広帯域強震観測

作成者
本文言語
出版者
発行日
収録物名
開始ページ
終了ページ
出版タイプ
アクセス権
JaLC DOI
概要 Two mainshocks of the Amamioshima-Kinkai earthquakes occurred at the southeast from Kikai Island on October 18 (M6.7) and 19 (M6.6), 1995. Those were observed by the two seismometers (STS-2 and VSElle.../12e) which had been installed at temporal station eve (ehojabaru visitor center) near Kuju volcano, about 560 km north from the epicenters. In order to observe near-field seismic waves of aftershocks we installed the broadband strong-motion seismometer (VSElle/12e) at temporal station TKG (Takigawa elementary school) in Kikai Island, the nearest land to the aftershock region. We observed 40 events including the largest aftershock of M5.7 on November 1 during observation period from October 21, 1995 to February 18, 1996. The purpose of this paper is to describe the observational conditions, and to report the result of preliminary analysis of the observed seismograms. We transformed the seismograms from the two horizontal components of N30°W and N60゜Eto the radial and transverse components. We analyzed the Fourier amplitude spectra of SH waves by using FFT. We found that the SH wave of the largest aftershock has the two predominant frequencies of 0.5-0.7 Hz and 1.8- 2.5 Hz. Further, we integrated the velocity seismograms to get the displacement waveforms. Using the amplitude ratio of the vertical and radial components for the first pulses, we also evaluated the P-wave incident angles to the observation point. They show that the rays of P waves came up nearly perpendicularly to the surface of the observation point.続きを見る

本文ファイル

pdf 1902_p173 pdf 906 KB 135  

詳細

PISSN
NCID
レコードID
登録日 2021.10.15
更新日 2022.10.25

この資料を見た人はこんな資料も見ています