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reverse mark
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     The paper points out, before Tangshan earthquake and during its active period in 1976, a clear change of gravity field oecured in the east part of Beijing network. The ehange has a reverse mark to the gravity anomaly in earthquake foci area.
     本文指出,在1976年唐山地震前以及其活动期间,北京测网东部的重力场发生明显的变化,且呈现与震源区重力异常符号相反的变化特征。
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     Reverse Trade Mark Passing off and Its Legal Regulation
     论反向假冒行为及其法律规制
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     Similar to Mark W.
     采用类似于Mark w.
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     4, the mark.
     4、标定;
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     Reverse engineering
     逆向工程设计
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     Reverse transcriptase
     逆转录酶
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In order to probe into the feature of time-space variation of gravity field in Beijing area and provide continuous gravity data and background information for seismological surveillance and prediction. we made a series of correction for all gravity data from Apr. 1970 to Jun. 1985, such as the correction of calibration temperature, unifying baseline and gravity point sites and correcting the differences of two sets of gravimeterso. At the same time near the gravity points, we studied the relations of vertical...

In order to probe into the feature of time-space variation of gravity field in Beijing area and provide continuous gravity data and background information for seismological surveillance and prediction. we made a series of correction for all gravity data from Apr. 1970 to Jun. 1985, such as the correction of calibration temperature, unifying baseline and gravity point sites and correcting the differences of two sets of gravimeterso. At the same time near the gravity points, we studied the relations of vertical deformation and ground water level with gravity field, then got a set of basic information of time-spaee variation of gravity field, which lasted sixteen years in Beijing area.By discussing the relation of water Table and gravity field near the points, we found this factor may cause gravity change, which amounts to several dozen of microgal, approximately the same as premonitory symptome, so it must be Corrected.The paper points out, before Tangshan earthquake and during its active period in 1976, a clear change of gravity field oecured in the east part of Beijing network. The ehange has a reverse mark to the gravity anomaly in earthquake foci area. The auther considers that the change happen to have some internal relation with the stringthening of the strese field in North China during the active period of Tangshan earthquake, and are related to tectonic aetivety. So according to the data of gravity survey. the information of tectonic activity can be acquired.

作者对北京重力测网自1970年4月至1985年6月的全部测量资料进行了格值温度改正、统一基线场和点位、仪器台差改正等一系列的数据处理。同时,还对测点附近垂直形变和地下水水位变化与重力变化关系进行了探讨和改正,指出:该因素可引起的重力变化量与震兆信息大致相当,可达几十微伽,必须进行改正。 本文指出,在1976年唐山地震前以及其活动期间,北京测网东部的重力场发生明显的变化,且呈现与震源区重力异常符号相反的变化特征。作者认为,该区重力场的变化可能与唐山地震活动期间的华北地区应力场的加强有内在联系,是同此期间的构造活动相呼应的。因此根据重力测量资料可以获得构造活动的信息。

 
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