Abstract
The deep seismic reflection profiling carried out in Xingtai earthquake area provides a new knowledge of the crustal structure of the Shulu fault basin and its vicinity. In the Ningjin-Xinhe and Lincheng-Julu deep seismic reflection profiles trending in NWW, CDP stack profiles respectively show a one-side fault basin (i. e. Shulu fault basin) within TWT 4.0 s. The width of the basin is about 15 km (Eogene system boundary), and Xinhe fault extends to below TWT 4.0 s (i.e. 8 km deep) with listric shape as a main boundary fault. These profiles also display distinctly a detachment in mid-crust. The Xinhe fault extends downward and converges to the detachment. The results of deep seismic sounding and magnetotelluric sounding indicate the low-velocity and high-conductive zone beneath the detachment, which is beneficial to the detach between upper and lower plates. The Renxian-Ningjin deep seismic reflection profile trending in NNE lies within the fault basin, which shows the complicated structure of the basin. The shallow part of the profile is divided into three sub-basins by three lateral uplifts. In the mid-lower crust from Gengzhuangqiao to Xiaohezhuang of the profile, there are a lot of strong reflection events with laminae structure, which have been deformed strongly. Two NWW-trending profiles also have similar reflection feature. This may indicate that there is a relative large region where the magma upwell into mid-lower crust. The abnormal low velocity zone in lower crust indicates that the magmatism is still strong at present. The magmatism may be an important factor of the tectonic active region.
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References
Gazdag, J., 1978. Wave equation migration with the phase-shift method.Geophysics,43, 1342–1351.
Klemperer, S., Hange, T., Hauser, E., Oliver, J. and Potter, C., 1986. The Moho in the northern Basin and Range Province, Nevada, along the COCORP 40°N seismic reflection transect.Bull. Geol. Soc. Amer.,97, 603–617.
Liu, G. D., Shi, S. L. and Wang, B. J., 1984. Intracrustal high conductivity layer in North China and its relationship to tectonic activity of crust.Sciences in China,B9, 439–448 (in Chinese).
Meissner, R. and Wever, T., 1992. The possible role of fluids for the structuring of the continental crust.Earth-Science Review,32, 19–32.
Seismological Bureau of Hebei Province, 1986.Xingtai Earthquakes in 1966, 1–10. Seismoloical Press, Beijing (in Chinese).
Shao, X. Z., Zhang, J. R., Zhang, S. Y., Yang, Q. Y., Li, H. S. and Fan, H. J., 1993. Study of deep structures in Xingtai earthquake area by method of converted waves of earthquakes.Acta Geophysica Sinica,36, 609–620 (in Chinese).
Smith, R. B. and Bruhn, R. L., 1984. Intraplate extensional tectonics of the eastern Basin-Range inferences on structural style from seismic reflection data, regional tectonics, and thermal-mechanical models of brittle-ductile deformation.J. Geophys. Res.,89, 5733–5762.
Stolt, R. H., 1978. Migration by Fourier transform.Geophysics,43, 23–48.
Sun, W. C., Zhu, Z. P., Zhang, J. R., Sun, Q. M., Zhang, M. H. and Zheng, Y. J., 1986. Deep seismic sounding in North China. In:Developments in the Research of Deep Structure of China’s Continent, 20–123. Geological Press (in Chinese).
Teng, J. W., Feng, Z. F., Li, J. S., Chen, X. B., Wen, K. D., Zhang, J. R. and Xiong, C. J., 1974. The relationship between the deep structure background of the central region in North China plain and Xingtai earthquakes (1).Acta Geophysica Sinica,17, 255–271 (in Chinese).
Wang, C. Y., Wang, G. M., Lin, Z. Y., Zhang, S. W., Liu, Y. S., Mao, T. E., Liu, Y. S. and Duan, Y. W., 1993. A study on fine crustal structure in Xingtai earthquake area based on deep seismic reflection profiling.Acta Geophysica Sinica,36, 357–365.
Wang, C. Y., Zhang, X. K. and Wu, Q. J., 1994. A detachment revealed by deep seismic reflection profiling in Jizhong depression.Chinese Sciences Bulletin,39, 1112–1116.
Xu, J., Fang, Z. J. and Yang, L. H., 1988. Tectonic background and causative fault of 1966 XingtaiM s7.2 earthquake.Seismology and Geology,10, 51–59 (in Chinese).
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Contribution No. 94A0078, Institute of Geophysics, SSB, China.
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Wang, CY., Zhang, XK., Lin, ZY. et al. Characteristic of crustal structure in the shulu fault basin and its vicinity. Acta Seismologica Sinica 7, 587–594 (1994). https://doi.org/10.1007/BF02650744
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DOI: https://doi.org/10.1007/BF02650744