Department;
of;
Geophysics,;
College;
of;
Geology;
Engineering;
and;
Geomatics,;
Chang'an;
University,;
Xi'an;
710054,;
China;
Key;
Laboratory;
of;
Western;
China's;
Mineral;
Resources;
and;
Geology;
Engineering,;
Ministry;
of;
Education,;
Xi';
an;
710054,;
China;
Institute;
of;
Geophysics,;
ETH;
Zürich;
CH;
8092,;
Switzerland;
Department;
of;
Physics,;
University;
of;
Adelaide,;
Adelaide;
SA;
5005,;
Australia;