WANG ZhenYu,
SHE YaWen,
FU GuangYu et al
.2018.Density structures of crust and vertical tectonic stress field of lithosphere in Northeast Asia Chinese Journal of Geophysics(in Chinese),61(6): 2280-2291,doi: 10.6038/cjg2018L0209
Density structures of crust and vertical tectonic stress field of lithosphere in Northeast Asia
WANG ZhenYu1, SHE YaWen2,3, FU GuangYu1, PI YuYang4
1. Key Laboratory of Earthquake Prediction, Institute of Earthquake Forecasting, Chinese Earthquake Administration, Beijing 100036, China; 2. Hebei Earthquake Agency, Shijiazhuang 050021, China; 3. Institute of Geophysics, Chinese Earthquake Administration, Beijing 100081, China; 4. Institute of Seismology, Chinese Earthquake Administration, Wuhan 430071, China
Abstract：Considering the lateral density variation of crust, we investigate the isostatic state of Northeast Asia with the utilization of EIGEN-6C4 gravity data and ETOPO1 topography data, and analyze the uplifting mechanism of the Changbai Mountain. First, we study in detail two profiles in roughly east-west direction which stretch over Changbai Mountain and Sakhalin Island (profile A & B). Specifically, taking CRUST1.0 model as initial conditions, we inverse the density structure of Crust along the two profiles with Bouguer gravity anomalies, using Airy and Airy-Pratt isostasy theories, respectively. The results show that, to some degree, there is lateral inhomogeneity in the crust density structure along the profiles. Then, according to the inversed density structures and topography data we calculate the depth of isostasy along each profile. Based on the comparison of the depth of isostasy with the one of Moho, we calculate the vertical tectonic stress of the two profiles. And then, with the method illustrated above, we calculate the vertical tectonic stress along 21 profiles in exactly east-west direction within our study area, with sampling interval of 1 degree. By interpolating the above results we obtain the distribution of the vertical tectonic stress of the whole Northeast Asia. In total, the crust of Northeast Asia, whose vertical tectonic stress is about 0, is in isostatic state. Among which, the vertical tectonic stress at the Changbai Mountain is -(15~25) MPa, at Japan Islands is -(40~50)MPa, and at the Pacific trench is 15~25 MPa. Finally, we estimate the effective elastic thickness (Te) and the load ratio of the area around the Changbai Mountain, using the method of Free-air gravity anomaly admittance. The result shows that the Te of the Changbai Mountain is about 10 km, which mean that the lithosphere of the area is relatively soft. The initial load is mainly from the Moho, about 78% of total load, which suggest that the uplifting of the Changbai Mountain was mainly resulted from the uplifting of material of the Mantle.
Amante C, Eakins B W. 2009. ETOPO1 1 arc-minute global relief model:procedures, data sources and analysis. NOAA Technical Memorandum NESDIS NGDC-24, National Geophysical Data Center. USA:NOAA. Andersen O B. 2010. The DTU10 gravity field and mean sea surface.//Second international symposium of the gravity field of the Earth (IGFS2). Fairbanks, Alaska, 20-22. Brune J N. 1970. Tectonic stress and the spectra of seismic shear waves from earthquakes. Journal of Geophysical Research, 75(26):4997-5009. Cai S H, Tauxe L, Deng C L, et al. 2016. New archaeomagnetic direction results from China and their constraints on palaeosecular variation of the geomagnetic field in Eastern Asia. Geophysical Journal International, 207(2):1332-1342. Dang Y M, Yang Q, Cao X W. 2009. Research on tectonic stress field distribution within crust. Journal of Geodesy and Geodynamics (in Chinese), 29(2):4-6. Duan Y H, Zhao D P, Zhang X K, et al. 2009. Seismic structure and origin of active intraplate volcanoes in Northeast Asia. Tectonophysics, 470(3-4):257-266. Fielding E J, McKenzie D. 2012. Lithospheric flexure in the Sichuan basin and Longmen Shan at the eastern edge of Tibet. Geophysical Research Letters, 39(9):L09311, doi:10.1029/2012GL051680. Förste C, Bruinsma S, Abrikosov O, et al. 2014. EIGEN-6C4-The latest combined global gravity field model including GOCE data up to degree and order 1949 of GFZ Potsdam and GRGS Toulouse.//EGU General Assembly. Vienna:European Geosciences Union. Forsyth D W. 1985. Subsurface loading and estimates of the flexural rigidity of continental lithosphere. Journal of Geophysical Research:Solid Earth, 90(B14):12623-12632. Fu G Y, Gao S H, Freymueller J T, et al. 2014. Bouguer gravity anomaly and isostasy at western sichuan basin revealed by new gravity surveys. Journal of Geophysical Research:Solid Earth, 119(4):3925-3938. Gao S H, She Y W, Fu G Y. 2016. A new method for computing the vertical tectonic stress of the crust by use of hybrid gravity and GPS data. Chinese Journal of Geophysics (in Chinese), 59(6):2006-2013, doi:10.6038/cjg20160607. Ito T, Hayashi K. 1991. Physical background to the breakdown pressure in hydraulic fracturing tectonic stress measurements. International Journal of Rock Mechanics and Mining Science & Geomechanics Abstracts, 28(4):285-293. Iwasaki T, Adachi K, Moriya T, et al. 2004. Upper and middle crustal deformation of an arc-arc collision across Hokkaido, Japan, inferred from seismic refraction/wide-angle reflection experiments. Tectonophysics, 388(1-4):59-73. Jiang X D, Jin Y, McNutt M K. 2004. Lithospheric deformation beneath the Altyn Tagh and West Kunlun faults from recent gravity surveys. Journal of Geophysical Research:Solid Earth, 109(B5):B05406. Laske G, Masters G, Ma Z T, et al. 2013. Update on CRUST1.0-A 1-degree global model of Earth's crust.//EGU General Assembly. Vienna:European Geosciences Union. Li J Y. 2006. Permian geodynamic setting of Northeast China and adjacent regions:closure of the Paleo-Asian Ocean and subduction of the Paleo-Pacific Plate. Journal of Asian Earth Sciences, 26(3-4):207-224. Marquardt D W. 1963. An algorithm for least-square estimation of nonlinear parameters. Journal of the Society for Industrial and Applied Mathematics, 11(2):431-441. Maruyama S, Seno T. 1986. Orogeny and relative plate motions:Example of the Japanese Islands. Tectonophysics, 127(3-4):305-329. Maruyama S, Isozaki Y, Kimura G, et al., 2006. Paleogeographic maps of the Japanese Islands:plate tectonic synthesis from 750 Ma to the present. Island Arc, 6(1):121-142. McKenzie D, Fairhead D. 1997. Estimates of the effective elastic thickness of the continental lithosphere form Bouguer and free air gravity anomalies. Journal of Geophysical Research:Solid Earth, 102(B12):27523-27552. McKenzie D. 2003. Estimating Te in the presence of internal loads. Journal of Geophysical Research:Solid Earth, 108(B9):2438, doi:10.1029/2002JB001766. Pavlis N K, Holmes S A, Kenyon S C, et al. 2013. The development and evaluation of the Earth Gravitational Model 2008 (EGM2008). Journal of Geophysical Research:Solid Earth, 117(B4):B04406, doi:10.1029/2011JB008916. Plomerová J, Liebermann R C, Babuška V. 1998. Geodynamics of lithosphere and earth's mantle:seismic anisotropy as a record of the past and present dynamic processes. Pure and Applied Geophysics, 151(2-4):213-219. Priestley K, Debayle E, Mckenzie D, et al. 2006. Upper mantle structure of Eastern Asia from multimode surface waveform tomography. Journal of Geophysical Research:Solid Earth, 111(B10):B10304, doi:10.1029/2005JB004082. Scheirer D, Forsyth D W, Hosford A. 1995. Multitaper estimates of the lithospheric strength of the Basin and Range province. Eos, 76, 17. She Y W, Fu G Y, Su X N, et al. 2016. Crustal isostasy and uplifting mechanism of the Liupanshan area. Progress in Geophysics (in Chinese), 31(4):1464-1472, doi:10.3969/j.issn.0253-4975.2015.09.080. Sibson R H. 2003. Brittle-failure controls on maximum sustainable overpressure in different tectonic regimes. AAPG Bulletin, 87(6):901-908. Simons F J, Zuber M T, Korenaga J. 2000. Isostatic response of the Australian lithosphere:Estimation of effective elastic thickness and anisotropy using multitaper spectral analysis. Journal of Geophysical Research:Solid Earth, 105(B8):19163-19184. Talwani M, Worzel J L, Landisman M. 2012. Rapid gravity computations for two-dimensional bodies with application to the Mendocino submarine fracture zone. Journal of Geophysical Research, 64(1):49-59. Tang Y C, Obayashi M, Niu F L, et al., 2014. Changbaishan volcanism in Northeast China linked to subduction-induced mantle upwelling. Nature Geoscience, 7(6):470-475. Tao K, Niu F L, Ning J Y, et al. 2014. Crustal structure beneath NE China imaged by NEEESSArray receiver function data. Earth and Planetary Science Letters, 398:48-57. Thomson D J. 1982. Spectrum estimation and harmonic analysis. Proceedings of the IEEE, 70(9):1055-1096. Turcotte D L, Schubert G. 2002. Geodynamics. 2nd ed. Cambridge:Cambridge University Press. Wada I, He J H, Hasegawa A, et al. 2015. Mantle wedge flow pattern and thermal structure in Northeast Japan:Effects of oblique subduction and 3-D slab geometry. Earth and Planetary Science Letters, 426:76-88. Watts A B. 2001. Isostasy and Flexure of the Lithosphere. Cambridge:Cambridge University Press. Won I J, Bevis M. 1987. Computing the gravitational and magnetic anomalies due to a polygon:Algorithms and Fortran subroutines. Geophysics, 52(2):232-238. Zang S X, Ning J Y. 1996. Study on the subduction zone in western Pacific and its implication for the geodynamics. Acta Geophysica Sinica (in Chinese), 39(2):188-202. Zhang L M, Tang X M. 1983. The underthrusting movement of the western Pacific plate and the deep focus earthquake zone of northeast China. Acta Geophysica Sinica (in Chinese), 26(4):331-340. Zhang Y Q, Wang Q S, Teng J W. 2010. The crustal isostatic anomaly beneath eastern Tibet and western Sichuan and its relationship with the distribution of earthquake. Chinese Journal of Geophysics (in Chinese), 53(11):2631-2638, doi:10.3969/j.issn.0001-5733.2010.11.011. Zhao D P, Tian Y. 2013. Changbai intraplate volcanism and deep earthquakes in East Asia:A possible link?. Geophysical Journal International, 195(2):706-724. Zhao Q, Wu W W, Wu Y L. 2017. Using combined GRACE and GPS data to investigate the vertical crustal deformation at the northeastern margin of the Tibetan Plateau. Journal of Asian Earth Sciences, 134:122-129, doi:10.1016/j.jseaes.2016.11.010. Zheng Y, Shen W S, Zhou L Q, et al. 2011. Crust and uppermost mantle beneath the North China Craton, northeastern China, and the Sea of Japan from ambient noise tomography. Journal of Geophysical Research:Solid Earth, 116(B12):B12312, doi:10.1029/2011JB008637. Zhu Y Q, Wen X Z, Sun H P, et al. 2013. Gravity changes before the Lushan, Sichuan, MS=7.0 Earthquake of 2013. Chinese Journal of Geophysics (in Chinese):56(6):1887-1894, doi:10.6038/cjg20130611. 党亚民, 杨强, 曹学伟. 2009. 地壳内构造应力的分布研究. 大地测量与地球动力学, 29(2):4-6. 高尚华, 佘雅文, 付广裕. 2016. 利用重力/GPS联合观测数据计算地壳垂向构造应力的新方法. 地球物理学报, 59(6):2006-2013, doi:10.6038/cjg20160607. 佘雅文, 付广裕, 苏小宁等. 2016. 六盘山地区地壳重力均衡与隆升机制研究. 地球物理学进展, 31(4):1464-1472, doi:10.3969/j.issn.0253-4975.2015.09.080. 臧绍先, 宁杰远. 1996. 西太平洋俯冲带的研究及其动力学意义. 地球物理学报, 39(2):188-202. 张立敏, 唐晓明. 1983. 西太平洋板块俯冲运动与中国东北深震带. 地球物理学报, 26(4):331-340. 张永谦, 王谦身, 滕吉文. 2010. 川西藏东地区的地壳均衡异常及其与地震分布的关系. 地球物理学报, 53(11):2631-2638, doi:10.3969/j.issn.0001-5733.2010.11.011. 祝意青, 闻学泽, 孙和平等. 2013. 2013年四川芦山MS7.0地震前的重力变化. 地球物理学报, 56(6):1887-1894, doi:10.6038/cjg20130611.
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