【摘要】：利用分測線零漂改正方法和格值系數(shù)變化檢測方法,對云南重力測區(qū)2014年兩期CG-5重力儀觀測數(shù)據(jù)進(jìn)行了精細(xì)處理,獲得了該地區(qū)重力場變化,并用絕對重力觀測結(jié)果進(jìn)行了驗證。結(jié)果表明:(1)CG-5重力儀零漂率存在明顯的隨時間變化,C1169和C1170兩臺重力儀在第一期觀測時間內(nèi)呈近似線性的增大趨勢,變化量達(dá)20×10~(-8) m·s~(-2)·h~(-1),第二期觀測時間內(nèi)則趨于穩(wěn)定,經(jīng)零漂改正后,觀測數(shù)據(jù)聯(lián)測精度明顯提高;(2)C1170重力儀格值系數(shù)變化發(fā)生了明顯變化,變化量約為-0.000 100;(3)經(jīng)格值系數(shù)改正后,獲得的重力變化結(jié)果與絕對重力觀測結(jié)果更為一致,重力場變化圖像更為清楚地反映了昭通-魯?shù)閿嗔褍蓚?cè)的差異變化和魯?shù)?.5級地震的發(fā)震背景,驗證了大地震一般發(fā)生在與主要活動斷裂一致的重力場變化正負(fù)轉(zhuǎn)換帶上這一結(jié)論,說明本文所用方法能有效消除觀測數(shù)據(jù)中的系統(tǒng)誤差,有利于真實重力場變化信息的獲取。
[Abstract]:Two CG-5 gravimeter observations in Yunnan gravity survey area in 2014 were carefully processed by using the zero-drift correction method and the lattice coefficient change method, and the variation of gravity field in this area was obtained. The results are verified by absolute gravity observations. The results show that: (1) the zero drift rate of CG-5 gravimeter varies obviously with time, and the C1169 and C1170 gravimeters show an approximate linear increasing trend during the first observation period. The variation is up to 20 脳 10 ~ (-8) Ms ~ (-2) h ~ (-1), but it tends to be stable during the second observation period. (2) the change of the lattice coefficient of C1170 gravimeter is about-0.000; (3) after correction of lattice coefficient, the result of gravity variation is more consistent with that of absolute gravity observation. The gravity field variation image more clearly reflects the difference between the two sides of the Zhaotong-Ludian fault and the earthquake background of the Ludian earthquake with M _ S 6.5. The conclusion that large earthquakes generally occur along the positive and negative transition zones of gravity field changes consistent with the main active faults is verified. It is shown that the method used in this paper can effectively eliminate the systematic errors in the observed data and is beneficial to the acquisition of real gravity field variation information.
【作者單位】： 中國科學(xué)院大學(xué)地球科學(xué)學(xué)院;中國地震局地震研究所;中國科學(xué)院測量與地球物理研究所;云南省地震局;
【基金】：中國地震局地震研究所所長基金(201326121);中國地震局地震行業(yè)科研專項(201308004,201508009) 國家自然科學(xué)基金(41304059) 大地測量與地球動力學(xué)國家重點實驗室開放基金(SKLGED2013-1-2-EZ,SKLGED2013-1-1-Z)~~
【分類號】：P315.726
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本文編號：2366467