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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Earthquake duration magnitude ： ウィキペディア英語版 Earthquake duration magnitude The concept of Earthquake Duration Magnitude - originally proposed by Bisztricsany〔Bisztricsany, E. A., 1958, A new method for the determination of the magnitude of earthquakes. ''Geofiz. Kozl.'', 69-76.〕 in 1958 using surface waves only - is based on the realization that on a recorded earthquake seismogram the total length of the seismic wavetrain - sometimes referred to as the CODA - reflects its size. Thus larger earthquakes give longer seismograms (well as stronger seismic waves ) than small ones. The seismic wave interval measured on the time axis of an earthquake record - starting with the first seismic wave onset until the wavetrain amplitude diminishes to at least 10% of its maximum recorded value - is referred to as "earthquake duration". It is this concept that Bisztricsany first used to develop his Earthquake Duration Magnitude Scale employing surface wave durations. ==Earthquake Duration Magnitude () Development== In 1965, Solovev〔Solov’ev, S. L., Seismicity of Sakalin. Bull. Earth Res. Inst.,Tokyo Univ., 1965, 43, 95–102.〕 proposed the use of total duration instead of the duration of surface waves. In 1972, Lee et al.〔Lee, W. H. K., Bennet, R. E. and Meaghu, K. L., A method of estimating magnitude of local earthquakes from signal duration. U.S. Geological Survey Open File Report, 1972, 28 pp.〕 used coda duration for the first time to estimate Richter magnitude of local Californian earthquakes. Based on their study, they suggested that it is appropriate to estimate the magnitude of local earthquakes using signal duration. More recently, the development in instrumentation led to the use of signal duration to estimate the coda magnitude (Md) for earthquakes recorded on short-period vertical seismographs. Numerous studies determined the relation between coda duration and magnitude for different regions of the World. According to a recent study by Mandal et al. (2004)〔Mandal, P., Narasaiah, R., Raju P. S., & R. K. Chandha, 2004. Coda duration magnitude scale of 2001 Bhuj aftershoks, India. Current Science, Vol. 87, No. 4, 2004. (India).〕 previous studies showed that duration magnitude estimation is quite stable for local earthquakes ranging from magnitude Md 0.0 to 5.0. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Earthquake duration magnitude」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.