ANALYSIS OF REPEAT ABSOLUTE GRAVIMETRIC RESULTSAT CHENGDU SEISMOSTATION
Xing Lelin 1,2,3) ;Li Hui 1,2) ; He Zhitang 4) ; Dong Zhengyao 1,2) ; and Tan Hongbo 1,2)
1)Institute of Seismology, CEA ,Wuhan 430071 2)Crustal Movement Laboratory, Wuhan 4300713)School of Geodesy and Geomatics, Wuhan University, Wuhan 4300794)Shanxi Bureau of Surveying and Mapping, Xi’an 710054
摘要 2007年4月—2008年6月，用FG5/232、FG5/214绝对重力仪在成都地震基准台的绝对重力基准点进行了5次绝对重力重复观测，每次观测结果的标准偏差均小于±2×10 -8 ms -2，证明该绝对重力基准点环境噪声干扰小，地质条件稳定；通过对观测数据的处理和分析认为，2007年12月绝对重力值较2007年4月增大5×10 -8 ms -2，汶川大地震发生后，重力整体变化趋势为下降、略有升高起伏状态，但仍未恢复。
Abstract：The repeat absolute gravity observation had been done five times at Chengdu station by FG5/214 and FG5/232 absolute gravimeter from April,2007 to June,2008, and every standard deviation is less than ±2×10 -8 ms -2
.The results show that the environmental noise of Chengdu station is very little and the geologic condition is stable; and by the processing and analyzing of the observed data, it shows that the gravity values in December,2007 increased 5×10 -8 ms -2 than that in April,2007, after the Wenchuan Ms8.0 earthquake happened, the trend of whole gravity change has dropped and some times risen with some ascendant but still has not come back to the former normal value.
