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《Progress in Geophysics》 2017-06
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Gravity field and characteristics of crustal structure in Subei basin

CHEN Yan;ZHANG Jing-fa;JIANG Wen-liang;TIAN Tian;Institute of Crustal Dynamics,China Earthquake Administration;Key Laboratory of Crustal Dynamics,China Earthquake Administration;Institute of Geology,China Earthquake Administration;  
In recent years,Subei basin has been widely concerned by scholars, as an important oil and gas development base in Eastern China, which has three layers that is " downwarpeddepression-downwarped"structure,and the dustpan-shaped sunken as a typical characteristic. In order to make a further analysis on the crustal structure of the Subei basin, we used gravity data to inverting the deep and shallow structures of Subei basin through the wavelet decomposition method and Parker density interface inversion method,and made a division of the secondary tectonic units inside the Subei basin,based on the wavelet details. We also analyzed the seismic environment in Subei basin with the seismic data and deep tectonic characteristics,proving the main factors influencing the seismic activity are plate and fault,and the most of earthquakes distribute along the boundary of structures. Combining with the previous research results,we analyzed the formation mechanism,stress environment and deep tectonic structure of the Subei basin,revealing the in-phase relationship between Moho deep tectonic structure with shallow structure of Subei basin,tinking that Subei basin since Mesozoic formation,not only controlled by the thrust nappe in front of the Sulu orogenic belt,but also influenced by the stress field result from alternating left-lateral and dextrorotation tectonic movement of Tanlu fault.
【Fund】: 中国地震局地壳应力研究所基本科研业务专项(ZDJ2012-15)资助
【CateGory Index】: P312;P315.2
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