jgg     2015 35 (3):  533-536    ISSN: 0412-1961  CN: 21-1139/TG A Data Detecting Method Using Characteristic Value of Earthquake  Precursor Observation Time Series 1 Institute of Crustal Dynamics, CEA, 1 Anningzhuang Road, Beijing 100085,China 2 Earthquake Administration of Handan City, 496 Congtai Road,Handan 056008, China Received: 2014-05-09  Revised: null  Online: 2015-06-02 Supporting info