jgg     2014 34 (2):  10-13    ISSN: 0412-1961  CN: 21-1139/TG EFFECT OF GEOID UNDULATION ON INVERSION OF DENSITY  STRUCTURES OF THE EARTH 1)National Earthquake Infrastructure Service，Beijing 100045 2)State Key Laboratory of Geodesy and Earth’s Dynamics，IGGCAS，Wuhan 430077 3)Key Laboratory of the Earth’s Deep Interior Chinese Academy of Science，Beijing 100026 Received: 2013-07-03  Revised: null  Online: 2014-04-21 Supporting info