TITLE:
Some Mass Migration Underground Found in Beijing Area
AUTHORS:
Zheng Xin Li, Jin Song Ping, Yong Zhang Yang, Alexander Gusev
KEYWORDS:
Component, Underground Mass Migration, Gravity Field, Earthquake, PZT
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.2 No.3,
June
13,
2014
ABSTRACT:
The relationship between the
change of a local gravity field and the mass migration underground is discussed
by means of using a point-source disturbed body as a substitute for the mass
migration underground. Some significant local gravity field changes in Beijing
area have been found, from which the three parameters of the disturbed bodies,
location, depth and mass, have been derived successfully from the observations
of a gravimetric network. In order to determine the depth of a body, a new
approach is suggested in which the gravity change difference is used instead of
the gravity change itself. The mass of a disturbing body has been estimated
properly. Astronomical PZT is suggested for this kind of survey. The results
provide us a picture of the underground mass migration with which the gravity changes
on the ground surface may be interpreted in a better way. This additional
information may be useful in seismological studies.