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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 Surface wave magnitude ： ウィキペディア英語版 Surface wave magnitude The surface wave magnitude ($M\_s$) scale is one of the magnitude scales used in seismology to describe the size of an earthquake. It is based on measurements in Rayleigh surface waves that travel primarily along the uppermost layers of the earth. It is currently used in People's Republic of China as a national standard (GB 17740-1999) for categorising earthquakes.〔 〕 Surface wave magnitude was initially developed in 1950s by the same researchers who developed the local magnitude scale ML in order to improve resolution on larger earthquakes:〔 〕 Recorded magnitudes of earthquakes during that time, commonly attributed to Richter, could be either $M\_s$ or $M\_L$. ==Definition== The formula to calculate surface wave magnitude is:〔〔It is obvious that the entire formula cannot stand dimensional analysis without additional qualifications. References here provide no such qualification.〕 $M\; =\; \backslash log\_\backslash left(\backslash frac\backslash right)\_(\backslash Delta)\; +\; 3.5$ According to GB 17740-1999, the two horizontal displacements must be measured at the same time or within 1/8 of a period; if the two displacements have different periods, weighed sum must be used: $T\; =\; \backslash frac\; +\; T\_A\_\}\}$ where AN is the north-south displacement in μm,　AE is the east-west displacement in μm,　TN is the period corresponding to AN in s, and TE is the period corresponding to AE in s. 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「Surface wave 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.