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


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 earthquake1995.10.05, Mb 5.0in 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.

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Y. Yang, J. Ping and Z. Li, "Plumb Line Variations (PLV) at China and Their Relation with Earthquakes and Underground Materials Changes," Open Journal of Geology, Vol. 3 No. 2B, 2013, pp. 38-40. doi: 10.4236/ojg.2013.32B009.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Z. X. Li, H. Li,Y. F. Li and Y. B. Han, “Non-tidal Variations in the Deflection of the Vertical at Beijing Observatory,” Journal of Geodesy, Vol. 78, No. 10, 2005, pp. 588-593.doi:10.1007/s00190-004-0421-2
[2] H. Li, G. Y. Fu and Z. X. Li, “Plumb Line Deflection Varied with Time Obtained by Repeated Gravimetry,” Acta Seimologica, 2001, pp. 66-71.
[3] Z. X. Li and H. Li, “Earthquake-Related Gravity Field Changes at Beijing-Tangshan Gravimetric Network,” Studia Geophysica et Geodaetica, Vol. 53, 2009, pp. 185-197. doi:10.1007/s11200-009-0012-z
[4] Z. X Li and H. Li, “Relation between Plumb Line Variation in Tangshan Region and Underground Material Changes. Acta Seimologica,” Vol. 33, No. 6, 2011, pp. 817-827.

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