Plumb Line Variations (PLV) at China and Their Relation with Earthquakes and Underground Materials Changes

Yongzhang Yang, Jinsong Ping, Zhengxin Li

1National Astronomical Observatories, CAS, Beijing China 2Shanghai Astronomical Observatory, CAS Shanghai China.

DOI: 10.4236/ojg.2013.32B009                

Abstract

Plumb line variations (PLV) of points at Tangshan and Midu during 1985-1998 are determined by using the 46 batch repeated gravity observations of the Beijing-Tangshan network and 32 batch repeated gravity observations of the West-Yunan network. As for Tangshan region, relation between underground matter change (UMC) and the PLV on ground are discussed and approach of determining the UMC by a derived regional PLV is found. The UMC before and after earthquake（1995.10.05, Mb 5.0）in Tangshan region, as an example, is studied, giving the location and depth of the mass center of underground disturbing body as well as its mass quantity.

Keywords

Plumb line Variations; Earthquake; Gravimetric Network; Underground Material Changes

Conflicts of Interest

The authors declare no conflicts of interest.

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