jgg     2013 33 (增1):  129-132    ISSN: 0412-1961  CN: 21-1139/TG ANALYSIS ON MIGRATION OF HISTORY DATA OF FUJIAN  PRECURSOR NETWORK Earthquake Administration of Fujian Province, Fuzhou 350003 Received: 2013-05-17  Revised: null  Online: 2013-09-25 Supporting info