jgg     2014 34 (2):  120-123    ISSN: 0412-1961  CN: 21-1139/TG EFFECTS OF FOG AND HAZE WEATHER ON GPS ZENITH  TROPOSPHERIC DELAY  AND PRECIPITABLE WATER VAPOR 1）Hebei Researching Center of Earthquake Engineering，Tangshan 063009 2）State Key Laboratory of Geodesy and Earth's Dynamics, Wuhan 430077 3）School of Traffic and Transportation Engineering，CUST，Changsha 410042 4）School of Civil Engineering，Central South University，Changsha 410075 5）Earthquake Administration of Beijing Municipality，Beijing〓100080 Received: 2014-01-15  Revised: null  Online: 2014-04-21 Supporting info