共查询到19条相似文献，搜索用时 140 毫秒
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钻孔耦合对体应变观测的影响分析 总被引：4，自引：0，他引：4
利用三层厚壁筒组合模型,给出不同类型体应变的相互转换关系,分析模型参数变化对3类体应变仪观测的影响。通过对全国60多个台站的体应变观测资料分析,发现钻孔的气压系数与潮汐因子无简单对应关系。利用固体潮标定不同台站的体应变到统一系统的体应变,结果表明,多数台站存在体应变潮汐因子观测值比理论值明显偏小现象,推测可能与钻孔存在非完全耦合有关。 相似文献
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分时段研究降雨、钻孔水位、工程施工等因素对青岛地震台体应变的影响，研究结果表明:钻孔水位反映区域地下水主要由降雨补给，降雨下渗改变地下水状态，并影响体应变观测；青岛体应变与钻孔水位的相关性及其周期特性均在2015年前后出现变化，可能与2015—2016年降雨偏少及工程施工有关；2018年1月17日台站钻孔施工很可能改变了体应变周围岩石孔隙环境，并扩大孔隙压力作用系数，可解释2018年3月以来水位小幅上升引起的体应变显著压性上升现象，受钻孔施工的影响，体应变与钻孔水位相关性的滞后特征明显减弱。 相似文献
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选取乾陵地震台2018—2020年钻孔体应变观测资料,进行完整性、年零漂和观测资料精度分析,通过采样调和分析,评价观测数据质量,并对自然环境变化、仪器系统故障和人为干扰对观测数据的影响进行分析,探讨该台钻孔体应变观测映震能力,认为： ①乾陵地震台体应变测项运行良好,观测数据质量较高; ②降雨、气压是影响体应变观测数据的主要干扰因素; ③体应变对全球7级以上、中国6级以上地震同震响应较明显,震级越大,同震响应持续时间越长。 相似文献
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《内陆地震》2015,(3)
对昌平北大200号台Sacks体应变观测值与固体潮、气压、水位关系进行了初步分析,并在干扰分析的基础上对2008年5月12日四川汶川8.0级地震前体应变观测资料进行了震例研究。震前该台体应变观测到的短临异常可靠,异常特征:①汶川地震前体应变记录到1年尺度的趋势异常,表现为拉张性变化,累计量约4 000×10~(-9),与之配套的是临震前兆异常也表现为拉张型的突变;②在2008年3月1日~5月7日体应变记录到了拉张型的间断突变异常;③在2008年4月13日~5月11日记录到间断的形态畸变,其中有4次之后出现压性突变;④在2008年5月1~3日、5、7、9~12日的畸变过程中出现高频成分增多的现象,通过小波分析,发现是震前慢地震引起的。分析结果表明,在对气压、水位等于扰因素分析的基础上,体应变观测出现应变固体潮畸变,并在畸变过程中连续多次出现张性压性突变、高频成分增多等异常现象可作为地震短临预测的指标。 相似文献
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据频谱特征分析短时气压波动对体应变的影响 总被引：2，自引：0，他引：2
针对短时气压波动对体应变观测资料的影响,整理易县台2002～2007年体应变、气压、降水等分钟值资料,并从中选取4个具有明显特征的时间段,采用数字滤波去除原始数据中的长周期成分,用快速傅里叶变换分析体应变的高频谱特征。计算结果表明,短时气压波动对体应变高频谱特征具有显著影响,主要影响周期为53～67 min;在气压平稳情况下,体应变的优势周期相对集中,高频谱幅度最小;而在短时气压波动及降水情况下,体应变的优势周期更趋于分散,体应变响应幅度相对较大。对体应变分钟值资料的高频信息进行分析时,需要采取回归分析、数字滤波等方法消除短时气压波动对体应变观测资料的影响。 相似文献
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分析合肥地震台钻孔体应变观测资料干扰因素及特征,发现水位和气压等因素对TJ-Ⅱ型钻孔应变仪影响显著.在该地震台观测优化改造期间,钻孔体应变受到临近钻孔灌水的影响,而降雨和灌水导致的水位变化,对体应变干扰程度不同. 相似文献
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本文对黄石台ORBES-81型石英伸缩仪的应变固体潮观测资料作了分析计算,其调和分析结果为:对O1波,振幅因子0.4219,相位滞后6°36＇;对M2波,振幅因子0.4256,相位滞后-4°42＇.同时,讨论了海潮引起的负荷潮汐应变的改正问题.模拟计算发现负荷潮汐应变与体潮应变大致为同一量级,文中列出了海潮改正后的结果,并作了讨论.最后,对黄石台伸缩仪的架设方位作了评价. 相似文献
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Yu. O. Kuzmin 《Izvestiya Physics of the Solid Earth》2017,53(6):825-839
The comparative analysis of the Earth’s surface deformations measured by ground-based and satellite geodetic methods on the regional and zonal measurement scales is carried out. The displacement velocities and strain rates are compared in the active regions such as Turkmenian–Iranian zone of interaction of the Arabian and Eurasian lithospheric plates and the Kamchatka segment of the subduction of the Pacific Plate beneath the Okotsk Plate. The comparison yields a paradoxical result. With the qualitatively identical kinematics of the motion, the quantitative characteristics of the displacement velocities and rates of strain revealed by the observations using the global navigational satellite system (GNSS) are by 1–2 orders of magnitude higher than those estimated by the more accurate methods of ground-based geodesy. For resolving the revealed paradoxes, it is required to set up special studies on the joint analysis of ground-based and satellite geodetic data from the combined observation sites. 相似文献
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YRY-4型钻孔应变观测抽水影响分析 总被引：1，自引：1，他引：0
分析泰安基准地震台YRY-4型钻孔应变仪仪器受不同位置抽水的影响,就地下岩石含水变化所产生的地形变干扰,简要分析地下水与地下岩石间的相互作用。这对地震前兆的研究有重要实用意义。 相似文献
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Milan Burša 《Studia Geophysica et Geodaetica》1966,10(4):401-410
Summary Orbital problems of satellite geodesy are based on the assumption that the geocentric orbital elements, giving the geocentric
position of the satellite being observed, are known for the moment of observation. The determination of such elements, however,
is possible only if the observed topocentric quantities were with sufficient accuracy reduced to geocentric ones. The reduction
assumes, however, that the position of the satellite stations with respect to the centre of mass of the Earth is known. This,
however, is not known and the determination of the geocentric positions is substantially the main problem of present-day geodesy.
In the case of natural celestial bodies, relatively far from the basic body, inaccuracies in correcting for the parallax practically
do not influence the solution. But in the case of near artificial Earth satellites these inaccuracies are not negligible.
The present paper analyzes from this aspect the case when the orbital elements are calculated from one position (three coordinates)
and three velocity components. Relations are derived (14, 15, 19, 22, 32, 38) giving the exactly geocentric elements. The
way in which they differ from the well-known relations of classical celestial mechanics (10, 11, 17, 20, 24–26, 36), giving
only certain approximate elements (we call them quasi-geocentric) consists in considering parameters defining the position
of the origin and direction of the axes of the used reference system in the Earth's body. In the derivation we neglected expressions
equal in order to the squares of the coordinates of the centre of the reference ellipsoid with respect to the centre of mass
of the Earth and to the squares of the angles between the axis of rotation of the ellipsoid and the mean rotation axis of
the Earth's inertia as well between the planes of the initial (Greenwich) astronomic and geodetic meridians.
Адрес: Politickych vězňů 12, Praha 1-Nové Město. 相似文献
Адрес: Politickych vězňů 12, Praha 1-Nové Město. 相似文献
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《Journal of Geodynamics》2003,35(4-5):541-551
The relationship between the tilts and strains of rocks and air pressure variations is investigated using deformation measurements from the Protvino observatory. Deformations due to air pressure are large in the observation area. The deformation response to the observed air pressure variations is compared with calculated values. In addition, the effective elasticity of the rock is determined from measured deformations in the underground galleries of the observatory after creating a load on the Earth surface. The observed tilts are considerably larger than the calculated values, for local as well as atmospheric loading, and the rock shear modulus determined from the tilt data is anomalously small compared to the mean shear modulus value for the crust. The observed horizontal strain data indicate no anomaly in the rock shear modulus value. The cavity effects at the observatory cannot explain this phenomenon. It may be caused by the rocks high fracturing. It is supposed, that the influence of cracks on the rock horizontal deformations is small if the cracks are closed and have the vertical direction. In case of large wavelength the large tilts correspond to the great displacements. These displacements may worsen the accuracy of geodetic measurements, especially when measuring vertical crustal movements. 相似文献
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A. A. Kovalev A. G. Kolesnik S. A. Kolesnik A. A. Kolmakov R. R. Latypov 《Geomagnetism and Aeronomy》2009,49(4):476-482
The influence of solar eclipses on the ionospheric plasma is considered based of the data of midlatitude vertical sounding stations during the entire period from the beginning of ionospheric studies in Russia. Changes in the electron density in the F and E regions during solar eclipses have been quantitatively estimated. 相似文献
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