TITLE:
Plumb Line Variations (PLV) at China and Their Relation with Earthquakes and Underground Materials Changes
AUTHORS:
Yongzhang Yang, Jinsong Ping, Zhengxin Li
KEYWORDS:
Plumb line Variations; Earthquake; Gravimetric Network; Underground Material Changes
JOURNAL NAME:
Open Journal of Geology,
Vol.3 No.2B,
October
22,
2013
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.