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タイトル: | Some Problems of Seismic Data Processing. Part 2. Data Processing Techniques for the Detection and Analysis of P and S Waves of Local Earthquakes |
著者: | FURUZAWA, Tamotsu |
発行日: | Sep-1974 |
出版者: | Disaster Prevention Research Institute, Kyoto University |
誌名: | Bulletin of the Disaster Prevention Research Institute |
巻: | 24 |
号: | 3 |
開始ページ: | 127 |
終了ページ: | 145 |
抄録: | The automated-analysis system for P and S waves of the local earthquakes obtained by the short-period system set up at the Amagase Crustal Movement Observatory are described. Firstly, as the basic knowledges necessary for automated analysis, the nature of noise, the frequency characteristics of P and S waves and the nature of particle motions are described. The system is composed of the determination of P onset, the determination of the directions of arrival and incidence of P waves, the determination of onsets of SH and SV waves and the computations of spectra of P, SH and SV waves. Onsets of P and S waves are determined by utilizing changes of both amplitude level and frequency between noise and signal. In the present method, it may be possible to determine the onset time of P wave with accuracy of ±0.05 sec for 90%, of local earthquakes with magnitude above 1.0. As for S wave, the onset time can be determined with accuracy of ±0.2 sec for about 90% of events of which the P onset time is defined. |
URI: | http://hdl.handle.net/2433/124846 |
出現コレクション: | Vol.24 Pt.3 |
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