Gravity and GPS Measurements at South-West Part of Baikal Rift
Gravity and GPS Measurements at South-West Part of Baikal Rift作者机构：Institute of Petroleum Geology and Geophysics Siberian Branch of Russian Academy of Sciences Novosibirsk 630090 Russia Georges Lemaitre Centre for Earth and Climate Research Catholic University of Louvain Louvain 1340 Belgium Institute of A utomatic and Electrometry Siberian Branch of Russian Academy of Sciences Novosibirsk 630090 Russia
出 版 物：《Journal of Earth Science and Engineering》 (地球科学与工程（英文版）)
年 卷 期：2014年第4卷第7期
页 面：400-409页
学科分类：081802[工学-地球探测与信息技术] 08[工学] 081105[工学-导航、制导与控制] 0818[工学-地质资源与地质工程] 0804[工学-仪器科学与技术] 081601[工学-大地测量学与测量工程] 0816[工学-测绘科学与技术] 0811[工学-控制科学与工程]
主 题：Monitoring of gravity variations absolute and relative gravimeters Baikal Rift GPS-monitoring earthquake
摘 要：Measurements of non-tidal variations of gravity （Ag）, which were obtained from 1992 to 2012 at the Talaya seismic station （located in the south-western part of the Baikal region）, are interpreted together with GPS （Global Position System） observation data, which were obtained from 2000 to 2013 at the same station. An absolute gravimeter was used for gravity observation. The strongest precision requirements concern tidal gravity prediction. It is the reason why we investigated tidal effect by LCR （LaCoste ＆ Romberg） gravimeter from 1996 to 1997 at the same station. We use tested tidal model for correction of gravity change. The linear component of gravity variations corresponds to changes in the elevation of the site. The correlation coefficient is close to the normal value of the vertical gradient of gravity. At this site, coseismic gravity variations at the time of the Kultuk earthquake （August 27, 2008, Mw = 6.5） were caused by a combined effect of the change of the site＇s elevation and deformation of the crust. Our estimations of the coseismic effects are consistent with results obtained by modeling based on the available seismic data.
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