jgg     2014 34 (2):  179-182    ISSN: 0412-1961  CN: 21-1139/TG DEVELOPMENT OF AUXILIARY OBSERVATION DEVICE FOR  DZW RELATIVE GRAVIMETER 1）Key Laboratory of Earthquake Geodesy，Institute of Seismology，CEA，Wuhan 430071 2）Wuhan Base of Institute of Crustal Dynamics，CEA，Wuhan 430071 3）Earthquake Administration of Shanxi Province，Taiyuan 030000 Received: 2013-10-10  Revised: null  Online: 2014-04-21 Supporting info