長周期帯域(2〜20秒)における気象庁変位強震計とSMAC型加速度計記録の信頼度について

概要

論文の詳細を見る
In this study, records obtained by the displacement-type seismographs of the Japan Meteorological Agency (JMA) were used because these seismographs have the most suitable instrumental characteristics in the period range between 2 and 20 sec. In order to examine the validity of JMA and SMAC records, we calculate the time history of ground displacement and acceleration response spectra during the Nihonkai-chubu earthquake of 1983, and compare them with the ones obtained from some other strong-motion seismographs. The displacement-time histories and response spectra calculated from the digitized seismograph records at three stations (Niigata, Akita and Tokyo) agree very well in the period range from 2 to 20 sec with the ones estimated from Omori's long-period strong-motion seismograph, acceleration and velocity-type strong motion seismographs having a wide dynamic range over a wide frequency range. These results seem to suggest that the JMA's displacement seismograms give a reliable and practical estimate in the period range of about 2 sec or longer, and are adequately available for their engineering purpose. When response spectra at four sites (Muroran, Hachinohe, Sakata and Akita) determined from SMAC accelerographs are compared with those from other kind of seismographs (JMA's displacement- and velocity-type seismographs), the former gives larger values for the period over about 5 sec than the latter. Following the study of Toki et al : (1986), its error depends on the shift and drift of the pen caused by a coupling between a deflect of the link and a friction between pen and paper. Futher study by the authors is underway for verifying the reliability of long-period component of SMAC and JMA's seismographs through a test on a shaking table. The paper will be published in forthcoming journal.
社団法人日本建築学会の論文
1987-09-30

長周期帯域(2〜20秒)における気象庁変位強震計とSMAC型加速度計記録の信頼度について

スポンサーリンク

概要

著者

関連論文

スポンサーリンク