jgg     2013 33 (增1):  143-146    ISSN: 0412-1961  CN: 21-1139/TG CHARACTERISTIC ANALYSIS OF GEOMAGNETIC DATA BEFORE AND  AFTER MODERATELY STRONG EARTHQUAKES IN SOUTHWEST  AREA OF ANHUI PROVINCE 1) Earthquake Administration of Hubei Province, Wuhan 430071 2 )Earthquake Administration of Anhui Province，Hefei 230031 Received: 2012-09-03  Revised: null  Online: 2013-09-25 Supporting info