翻訳と辞書 Words near each other ・ Normal Heights, San Diego ・ Normal invariant ・ Normal Is the Watchword ・ Normal law ・ Normal lens ・ Normal Life ・ Normal Life (TV series) ・ Normal Love ・ Normal map ・ Normal mapping ・ Normal matrix ・ Normal measure ・ Normal modal logic ・ Normal mode ・ Normal morphism ・ Normal moveout ・ Normal Music ・ Normal Musical Institute ・ Normal number ・ Normal number (computing) ・ Normal operator ・ Normal order ・ Normal order (disambiguation) ・ Normal order of an arithmetic function ・ Normal p-complement ・ Normal Park ・ Normal Park branch (CTA) ・ Normal People Are People You Don't Know That Well ・ Normal People Scare Me ・ Normal plane Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Normal moveout ： ウィキペディア英語版 Normal moveout In reflection seismology, normal moveout (NMO) describes the effect that the distance between a seismic source and a receiver (the offset) has on the arrival time of a reflection in the form of an increase of time with offset.〔(Schlumberger Oilfield Glossary. NMO. )〕 The relationship between arrival time and offset is hyperbolic and it is the principal criterion that a geophysicist uses to decide whether an event is a reflection or not. It is distinguished from dip moveout (DMO), the systematic change in arrival time due to a dipping layer. The normal moveout depends on complex combination of factors including the velocity above the reflector, offset, dip of the reflector and the source receiver azimuth in relation to the dip of the reflector. For a flat, horizontal reflector, the traveltime equation is: $t^2\; =\; t\_0^2\; +\; \backslash frac$ where ''x'' = offset; ''v'' = velocity of the medium above the reflecting interface; $t\_0$ = travel time at zero offset, when the source and receiver are in the same place. ==NMO correction== From the equation, it is possible to calculate the velocity when the offset and two-way times at zero and non-zero offset are known. This velocity is the NMO velocity and can be used to remove the effect of offset on the traveltimes (as shown in the diagram). NMO correction can be used as a seismic processing tool to powerfully distinguish between reflections and other events such as refractions, diffractions and multiples. If an accurate NMO correction has been applied, reflections will appear as straight horizontal lines (see diagram), refractions will now appear as inverse curves and diffraction and multiple arrivals will retain some curvature. These unwanted arrivals can now be removed with a properly designed filter. 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「Normal moveout」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.