jgg     2013 33 (4):  151-154    ISSN: 0412-1961  CN: 21-1139/TG INSTRUMENT SITE CALIBRATION CAN NOT BE REPLACED  BY DATA PROCESSING Earthquake Administration of Fujian Province, Fuzhou 350003 Received: 2012-10-23  Revised: null  Online: 2013-08-16 Supporting info