Advanced Search

EPP

地球与行星物理

ISSN  2096-3955

CN  10-1502/P

Citation: YuLan Li, BaoShan Wang, RiZheng He, HongWei Zheng, JiangYong Yan, Yao Li, 2018: Fine relocation, mechanism, and tectonic indications of middle-small earthquakes in the Central Tibetan Plateau, Earth and Planetary Physics, 2, 406-419. doi: 10.26464/epp2018038

2018, 2(5): 406-419. doi: 10.26464/epp2018038

SOLID EARTH: SEISMOLOGY

Fine relocation, mechanism, and tectonic indications of middle-small earthquakes in the Central Tibetan Plateau

1. 

Key Laboratory of Earthquake Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

2. 

Key Laboratory of Geodynamics of the Department of Natural Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

3. 

Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Corresponding author: HongWei Zheng, zhenghongwei004@sina.com

Received Date: 2018-06-21
Web Publishing Date: 2018-09-01

The medium-small earthquakes that occurred in the middle part of Tibetan Plateau (32°N–36°N, 90°E–93°E) from August 2016 to June 2017 were relocated using the absolute earthquake location method Hypo2000. Compared to the reports of Chinese Seismological Networks, our relocation results are more clustered on the whole, the horizontal location differences exceed 10 km, and the focal depths are concentrated in 0–8 km, which indicates that the upper crust inside the Tibetan Plateau is tectonically active. In June 2017 altogether eight earthquakes above magnitude 3.0 took place; their relocated epicenters are concentrated around Gêladaindong. The relocation results of M<3.0 small earthquakes also showed obvious differences. Therefore, we used the CAP method to invert for the focal mechanisms of theM ≥3.0 earthquakes; results generally tally with the surface geological structures, indicating that the Tibetan Plateau is still under the strong compressional force from the India Plate. Among them the eight earthquakes that occurred near Gêladaindong in June 2017 are all of normal fault type or with some strike-slip at the same time; based on previous research results we conjecture that these events are intense shallow crust responses to deep crust-mantle activities.

Key words: relocation; focal mechanism solution; compression; Gêladaindong; ground surface response

Bai, L., Li, G. H., Khan, N. G., Zhao J. M., Ding, L. (2017). Focal depths and mechanisms of shallow earthquakes in the Himalayan-Tibetan region. Gondwana Res., 41, 390–399. https://doi.org/10.1016/j.gr.2015.07.009

Chang, C. F., Chen, N. S., Coward, M. P., Deng, W. M., Dewey, J. F., Gansser, A., Harris, N. B. W., Jin, C. W., Kidd, W. S. F., … Zhang, Y. Q. (1986). Preliminary conclusions of the Royal Society and Academia Sinica 1985 geotraverse of Tibet. Nature, 323(6088), 501–507. https://doi.org/10.1038/323501a0

Chung, S. L., Chu, M. F., Zhang, Y. Q., Xie, Y. W., Lo, C. H., Lee, T. Y., Lan, C. Y., Li, X. H., Zhang, Q., Wang, Y. Z. (2005). Tibetan tectonic evolution inferred from spatial and temporal variations in post-collisional magmatism. Earth Sci. Rev., 68(3-4), 173–196. https://doi.org/10.1016/j.earscirev.2004.05.001

Data Management Centre of China National Seismic Network. (2007). Waveform data of China National Seismic Network Institute of Geophysics, China Earthquake Administration (in Chinese).222

Deng, Q. D. (1996). Active tectonics in China. Geol. Rev., 42(4), 295–299. https://doi.org/10.16509/j.georeview.1996.04.003

Deng, W. M., Zheng, X. L., Matsumoto, Y. (1996). Petrological characteristics and ages of cenozoic volcanic rocks from the Hoh Xil Mts. Qinghai Province. Acta Petrol. Miner., 15(4), 289–298

Deng, W. M., Sun, H. J., Zhang, Y. Q. (1999). K-Ar age of the Cenozoic volcanic rocks in the Nangqen Basin, Qinghai Province and its geological significance. Chin. Sci. Bull., 45(1), 1015–1019. https://doi.org/10.1007/BF02884983

Deng, W. M., Sun, H. J., Zhang, Y. Q. (2001). Petrogenesis of Cenozoic potassic volcanic rocks in Nangqen Basin. Chin. J. Geol., 36(3), 304–318. https://doi.org/10.3321/j.issn:0563-5020.2001.03.005

Gao, R., Chen, C., Lu, Z. W., Brown, L. D., Xiong, X. S., Li, W. H., Deng, G. (2013). New constraints on crustal structure and Moho topography in Central Tibet revealed by SinoProbe deep seismic reflection profiling. Tectonophysics, 606, 160–170. https://doi.org/10.1016/j.tecto.2013.08.006

Guan, Y., Wu, P., Fan, J., Fu, Y., Tang, L., Ma, F. H., (2017). Station distribution influence on locating results calculated by different methods—a case study of Lushan after-shocks. Earthquake Research in Sichuan, 1, 29–33

Guo, Z. F., Wilson, M., Liu, J. Q., Mao, Q. (2006). Post-collisional, potassic and ultrapotassic magmatism of the Northern Tibetan Plateau: Constraints on Characteristics of the Mantle Source, geodynamic setting and uplift mechanisms. J. Petrol., 47(6), 1177–1220. https://doi.org/10.1093/petrology/egl007

Hacker, B. R., Gnos, E., Ratschbacher, L., Grove, M., Mcwilliams, M., Sobolev, S. V., et al. (2000). Hot and dry deep crustal xenoliths from Tibet. Science, 287(5462), 2463–2466. https://doi.org/10.1126/science.287.5462.2463

Han, L. B., Jiang, C. S. (2012). Focal mechanism inversion of 8 Jun 2011 Toksun Ms 5.3 earthquake. Acta Seismol. Sin., 34(3), 415–422. https://doi.org/10.3969/j.issn.0253-3782.2012.03.014

He, R. Z., Liu, G. C., Golos, E., Gao, R., Zheng, H. W. (2014a). Isostatic gravity anomaly, lithospheric scale density structure of the northern Tibetan plateau and geodynamic causes for potassic lava eruption in Neogene. Tectonophysics, 628, 218–227. https://doi.org/10.1016/j.tecto.2014.04.047

He, R. Z., Shang, X. F., Yu, C. Q., Zhang, H. J., Van der Hilst, R. D. (2014b). A unified map of Moho depth and Vp/Vs ratio of continental China by receiver function analysis. Geophys. J. Int., 199(3), 1910–1918. https://doi.org/10.1093/gji/ggu365

He, R., Zhao, D., Gao, R., Zheng, H. (2010). Tracing the Indian lithospheric mantle beneath central Tibetan plateau using teleseismic tomography. Tectonophysics, 491(1), 230–243

Jiang, M., Xu, Z. Q., Qian, R. Y., Wang, Y. J., Zhang, L. S. (2006). Analysis of deep tectonic activity in the eastern segment of the northern margin of the Qinghai-Tibetan Plateau based on the Delingha earthquake. Geol. China, 33(2), 268–374. https://doi.org/10.3969/j.issn.1000-3657.2006.02.004

Jiang, M., Peng, M., Wang, Y. X., Tan, H. D., Li, Q. Q., Zhang, L. S., Wang, W. (2012). Geophysical evidence for deep subduction of Indian lithospheric plate beneath Eastern Himalayan Syntaxis. Acta Petrol. Sin., 28(6), 1755–1764

Kissling, E., Kradolfer, U., Maurer, H. (1995). VELEST User's Guide-Short Introduction. Zürich: Institute of Geophysics and Swiss Seismological Service, ETH Zürich.222

Klein, F. W. (2002). User's Guide to HYPOINVERSE-2000, A Fortran Program to Solve for Earthquake Locations and Magnitudes. Open File Report 02-171, United States Department of the Interior Geological Survey.222

Li, C., Zhai, Q. G., Dong, Y. S., Huang, X. P. (2006a). Discovery of eclogite and its geological significance in Qiangtang area, central Tibet. Chin. Sci. Bull., 51(9), 1095–1100. https://doi.org/10.1007/s11434-006-1095-3

Li, C., Zhai, Q. G., Chen, W., Yu, J. J., Huang, X. P., Zhang, Y. (2006b). Ar-Ar chronometry of the eclogite from central Qiangtang area, Qinghai-Tibet Plateau. Acta Petrol. Sin., 22(12), 2843–2849. https://doi.org/10.3969/j.issn.1000-0569.2006.12.003

Li, Y. H., Tian, X. B., Wu, Q. J., Zeng, R. S., Zhang, R. Q. (2006). The Poisson ratio and crustal structure of the central Qinghai-Xizang inferred from INDEPTH-III teleseismic waveforms: Geological and geophysical implications. Chinese J. Geophys., 49(4), 1037–1044. https://doi.org/10.3321/j.issn:0001-5733.2006.04.015

Liang, X. F., Tian, X. B., Zhu, G. H., Wu, C. L., Duan, Y. H., Li, W., Zhou, B. B., Zhang, M. H., Yu, G. P., … Teng, J. W. (2016). SANDWICH: a 2D broadband seismic array in Central Tibet. Seismol. Res. Lett., 87(4), 864–873. https://doi.org/10.1785/0220150243

Lin, A. M., Fu, B. H., Guo, J. M., Zeng, Q. L., Dang, G. M., He, W. G., Zhao, Y. (2002). Co-seismic strike-slip and rupture length produced by the 2001 Ms 8.1 Central Kunlun earthquake. Science, 296(5575), 2015–2017. https://doi.org/10.1126/science.1070879

Ma, Z. J. (1992). Research on the Seismogenic Layers of the China Mainland (in Chinese). Beijing: Seismological Press.222

Ma, Z. J., Chen, X. L., Ye, S. H., Lai, X. A., Wei, Z. Q., Chen, J. R., Ning, J. S., Xu, H. Z., Ding, G. Y. (2001). Contemporary crustal movement of continental China obtained by global positioning system (GPS) measurements. Chin. Sci. Bull., 46(18), 1552–1554. https://doi.org/10.1007/BF02900579

Mechie, J., Kind, R. (2013). A model of the crust and mantle structure down to 700 km depth beneath the Lhasa to Golmud transect across the Tibetan plateau as derived from seismological data. Tectonophysics, 606, 187–197. https://doi.org/10.1016/j.tecto.2013.04.030

Owens, T. J., Randall, G. E., Wu, F. T., Zeng, R. S. (1993). PASSCAL instrument performance during the Tibetan Plateau passive seismic experiment. Bull. Seismol. Soc. Am., 83(6), 1959–1970

Peng, M., Tan, H. D., Jiang, M., Wang, W., Li, Q. Q., Zhang, L. S. (2012). Joint inversion of receiver functions and magnetotelluric data: Application to crustal and mantle structure beneath central Namche Barwa, eastern Himalayan syntaxis. Chinese J. Geophys., 55(7), 2281–2291. https://doi.org/10.6038/j.issn.0001-5733.2012.07.014

Teng, J. W., Wang, S. Z., Yao, Z. X., Xu, Z. W., Zhu, Z. W., Yang, B. P., Zhou, W. H. (1980). Characteristics of the geophysical fields and plate tectonics of the Qinghai-Xizang Plateau and its neighbouring regions. Acta Geophys. Sin., 23(3), 254–268

Teng, J. W., Sun, K. Z., Wei, S. Y., Xue, C. S. (1989). Characteristics of seismicity in the Qinghai-Xizang Plateau and its marginal zone. In Summary of the abstracts of the Geophysical Institute of the Chinese Academy of Sciences (in Chinese). Beijing: Chinese Society for Rock Mechanics & Engineering.222

Tilmann, F., Ni, J., INDEPTH III Seismic Team. (2003). Seismic imaging of the downwelling Indian lithosphere beneath Central Tibet. Science, 300(5624), 1424–1427. https://doi.org/10.1126/science.1082777

Turner, S., Hawkesworth, C., Liu, J. Q., Rogers, N., Kelley, S., van Calsteren, P. (1993). Timing of Tibetan uplift constrained by analysis of volcanic rocks. Nature, 364(6432), 50–54. https://doi.org/10.1038/364050a0

Wang, C. S. (2001). Geological Evolution and Oil and Gas Prospect Evaluation in the Qiangtang Basin, Tibet (in Chinese). Beijing: Geological Publishing House.222

Wang, C. S., Dai, J. E., Zhao, X. X., Li, Y. L., Graham, S. A., He, D. F., Ran, B., Meng, J. (2014). Outward-growth of the Tibetan Plateau during the Cenozoic: A review. Tectonophysics, 621, 1–43. https://doi.org/10.1016/j.tecto.2014.01.036

Wang, S. Y., Gao, A. J., Xue, Z. H., Zhang, X. D., Guo, Y. (2000). Relocation of earthquakes in northeastern region of Qinghai-Xizang plateau and characteristics of earthquake activity. Acta Seismol. Sin., 13(3), 257–264. https://doi.org/10.1007/s11589-000-0034-7

Wen, S. L., Tao, X. L., Cao, H. W., Danzeng, Z. M., De, J. (2010). Seismic characteristic analysis of Nima Ms5.6 earthquake in Tibet. J. Inst. Dis.-Prevent. Sci. Technol., 12(1), 36–39. https://doi.org/10.3969/j.issn.1673-8047.2010.01.008

Williams, H. M., Turner, S. P., Pearce, J. A., Kelley, S. P., Harris, N. B. W. (2004). Nature of the source regions for post-collisional, potassic magmatism in southern and northern Tibet from geochemical variations and inverse trace element modelling. J. Petrol., 45(3), 555–607. https://doi.org/10.1093/petrology/egg094

Yang, Z. X., Chen, Y. T., Zheng, Y. J., Tu, X. W. (2003). Accurate relocation of earthquakes in central-western China using the double-difference earthquake location algorithm. Sci. China Ser. D, 46(S2), 181–188. https://doi.org/10.1360/03dz0014

Yao, H. Z., Duan, Q. F., Niu, Z. J. (2001). Progress work of the "Cibuzhang Interchange 1: 250000 Regional Geological Survey" in the Source Region of the Yangtze River. Geol. Miner. Resour. South China(3), 70–71

Yin, A., Harrison, T. M. (2000). Geologic evolution of the Himalayan-Tibetan orogen. Annu. Rev. Earth Planet. Sci., 28, 211–280. https://doi.org/10.1146/annurev.earth.28.1.211

Zheng, H. W., Li, T. D., Gao, R., Zhao, D. P., He, R. Z. (2007). Teleseismic P-wave tomography evidence for the Indian lithospheric mantle subducting northward beneath the Qiangtang terrane. Chinese J. Geophys., 50(5), 1418–1426

Zheng, J. D., Zheng, B. H. (1982). Study of the characteristics of seismology and geology in the Xizang region from satellite imagery. Seismol. Geol., 4(4), 35–44

Zheng, J. D. (1986). Seismicity in the Tibetan plateau. Chin. Sci. Bull.(23), 1815–1818

Zheng, X. F., Ouyang, B., Zhang, D. N., Yao, Z. X., Liang, J. H., Zheng, J. (2009). Technical system construction of Data Backup Centre for China Seismograph Network and the data support to researches on the Wenchuan earthquake. Chinese J. Geophys., 52(5), 1412–1417. https://doi.org/10.3969/j.issn.0001-5733.2009.05.031

Zou, C. Q., He, R. Z., Zhang, Z. (2012). Seismicity characteristics beneath the northern Tibetan Plateau and its tectonic significances. Prog. Geophys., 27(2), 429–440. https://doi.org/10.6038/j.issn.1004-2903.2012.02.006

Zhu, G. H., Liang, X. F., Tian, X. B., Yang, H. F., Wu, C. L., Duan, Y. H., Li, W., Zhou, B. B. (2017). Analysis of the seismicity in central Tibet based on the SANDWICH network and its tectonic implications. Tectonophysics, 702, 1–7. https://doi.org/10.1016/j.tecto.2017.02.020

Zhu, L. P., Helmberger, D. V. (1996). Advancement in source estimation techniques using broadband regional seismograms. Bull. Seismol. Soc. Am., 86(5), 1634–1641

Zhu, L. P., Helmberger, D. V., Saikia, C. K., Woods, B. B. (1997). Regional waveform calibration in the Pamir‐Hindu Kush region. J. Geophys. Res., 102(B10), 22799–22813. https://doi.org/10.1029/97JB01855

[1]

Shun-Rong Zhang, Philip J. Erickson, Larisa P. Goncharenko, Anthea J. Coster, Nathaniel A. Frissell, 2017: Monitoring the geospace response to the Great American Solar Eclipse on 21 August 2017, Earth and Planetary Physics, 1, 72-76. doi: 10.26464/epp2017011

[2]

Qing Wang, XiaoDong Song, JianYe Ren, 2017: Ambient noise surface wave tomography of marginal seas in east Asia, Earth and Planetary Physics, 1, 13-25. doi: 10.26464/epp2017003

[3]

LiangQuan Ge, JianKun Zhao, QingXian Zhang, YaoYao Luo, Yi Gu, 2018: Mapping of the lunar surface by average atomic number based on positron annihilation radiation from Chang’e-1, Earth and Planetary Physics, 2, 238-246. doi: 10.26464/epp2018023

[4]

XinYan Zhang, ZhiMing Bai, Tao Xu, Rui Gao, QiuSheng Li, Jue Hou, José Badal, 2018: Joint tomographic inversion of first-arrival and reflection traveltimes for recovering 2-D seismic velocity structure with an irregular free surface, Earth and Planetary Physics, 2, 220-230. doi: 10.26464/epp2018021

Article Metrics
  • PDF Downloads()
  • Abstract views()
  • HTML views()
  • Cited by(0)
Catalog

Figures And Tables

Fine relocation, mechanism, and tectonic indications of middle-small earthquakes in the Central Tibetan Plateau

YuLan Li, BaoShan Wang, RiZheng He, HongWei Zheng, JiangYong Yan, Yao Li