%0 Journal Article
%T Plumb Line Variations (PLV) at China and Their Relation with Earthquakes and Underground Materials Changes
%A Yongzhang Yang
%A Jinsong Ping
%A Zhengxin Li
%J Open Journal of Geology
%P 38-40
%@ 2161-7589
%D 2013
%I Scientific Research Publishing
%R 10.4236/ojg.2013.32B009
%X <p>
	<span>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</span><span style=\"font-family:ËÎÌå;\">£¨</span><span>1995.10.05, Mb 5.0</span><span style=\"font-family:ËÎÌå;\">£©</span><span>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.</span>
</p>
%K Plumb line Variations
%K Earthquake
%K Gravimetric Network
%K Underground Material Changes
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=38348