jgg     2013 33 (增1):  114-116    ISSN: 0412-1961  CN: 21-1139/TG INTEGRATED MANAGEMENT SYSTEM FOR SEISMIC  PRECURSOR DATABASE 1)Earthquake Administration of Tianjin Municipality, Tianjin 300201 2)China Earthquake Network Center, Beijing 100045 Received: 2012-08-24  Revised: null  Online: 2013-09-25 Supporting info