Abstract
Using multiple-scale mobile gravity data in the Sichuan-Yunnan area, we systematically analyzed the relationships between spatial-temporal gravity changes and the 2014 Ludian, Yunnan Province Ms6.5 earthquake and the 2014 Kangding Ms6.3, 2013 Lushan Ms7.0, and 2008 Wenchuan Ms8.0 earthquakes in Sichuan Province. Our main results are as follows. (1) Before the occurrence of large earthquakes, gravity anomalies occur in a large area around the epicenters. The directions of gravity change gradient belts usually agree roughly with the directions of the main fault zones of the study area. Such gravity changes might reflect the increase of crustal stress, as well as the significant active tectonic movements and surface deformations along fault zones, during the period of gestation of great earthquakes. (2) Continuous significant changes of the multiple-scale gravity fields, as well as greater gravity changes with larger time scales, can be regarded as medium-range precursors of large earthquakes. The subsequent large earthquakes always occur in the area where the gravity changes greatly. (3) The spatial-temporal gravity changes are very useful in determining the epicenter of coming large earthquakes. The large gravity networks are useful to determine the general areas of coming large earthquakes. However, the local gravity networks with high spatial-temporal resolution are suitable for determining the location of epicenters. Therefore, denser gravity observation networks are necessary for better forecasts of the epicenters of large earthquakes. (4) Using gravity changes from mobile observation data, we made medium-range forecasts of the Kangding, Ludian, Lushan, and Wenchuan earthquakes, with especially successful forecasts of the location of their epicenters. Based on the above discussions, we emphasize that medium-/long-term potential for large earthquakes might exist nowadays in some areas with significant gravity anomalies in the study region. Thus, the monitoring should be strengthened.
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References
Chen YT, Gu HD, Lu ZX (1979) Variations of gravity before and after the Haicheng earthquake, 1975, and the Tangshan earthquake, 1976. Phys Earth Planet Inter 18(4):330–338
Chen YT, Yang ZX, Zhang Y et al (2013) From 2008 Wenchuan earthquake to 2013 Lushan earthquake. Sci Sin Terrae 43(6):1064–1072 (in Chinese)
Gu GX, Kuo JT, Keren L et al (1997) Seismogenesis and occurrence of earthquakes as observed by temporally continuous gravity variations in China. Chin Sci Bull 42(18):1919–1930 (in Chinese)
Imanishi Y, Sato T, Higashi T, Sun WK, Okubo S (2004) A network of superconducting gravimeters detects submicrogal coseismic gravity changes. Science 306:476–478
Kuo JT, Zheng JH, Song SH (1999) Determination of earthquake epicentroids by inversion of gravity variation data in the BTTZ region, China. Tectonophysics 312(2):267–281
Li DW, Guifan C, Jili C et al (2013) Earthquake prediction: from Lushan earthquake to continental earthquakes. Earth Sci Front 20(3):1–10 (in Chinese)
Liang WF, ZhaoYunfeng, Yunma X et al (2013) Gravity observations along the eastern margin of the Tibetan Plateau and an application to the Lushan Ms7.0 earthquake. Earthq Sci 26(3–4):251–257
Liang WF, Guoqing Z, Zhu Y et al (2016) Gravity variations before the Menyuan Ms6.4 earthquake. Geodesy Geodyn 7(4):223–229
Ma J, Sheng-li M, Li-qiang L et al (1995) The stages of anomalies before an earthquake and characteristics of the spatial distribution. Seismol Geol 17(4):363–371 (in Chinese)
Ma J, Sheng-li M, Li-qiang L et al (2000) Experimental study on alternate slip of intersecting faults and block movement. Seismol Geol 22(1):65–73 (in Chinese)
Teng J, Denghai B, Yang H et al (2008) Deep processes and dynamic responses associated with the Wenchuan Ms8.0 earthquake of 2008. Chin J Geophys 51(5):1385–1402 (in Chinese)
Wen XZ (2000) Character of rupture segmentation of the Xianshuihe-Anninghe-Zemuhe fault zone, Western Sichuan. Seismol Geol 22(3):239–249 (in Chinese)
Wen XZ, Fan J, Guixi YI et al (2008) The earthquake zone on the Anninghe fracture, Western Sichuan. Sci China (Series D) 38(7):797–807 (in Chinese )
Wen XZ, Fang D, Guixi Y et al (2013) Earthquake potential of the Zhaotong and Lianfeng fault zones of the eastern Sichuan-Yunnan border region. Chin J Geophys 56(10):3361–3372 (in Chinese )
Yi GX, Xueze W, Jun F et al (2004) Assessing current faulting behaviors and seismic risk of the Anninghe-Zemuhe fault zone from seismicity parameters. Acta Seismol Sin 26(3):294–303 (in Chinese)
Zhu YQ, Zai-sen J, Bing C et al (2001) Study on evolution of gravity field prediction in the north-south seismic belt and the Eastern Qinghai-Xizang block. Earthq Res China 17(1):56–69 (in Chinese )
Zhu YQ, Hu B, Hui L et al (2003) Variation of gravity field of Xinjiang area and Jiashi Ms6.8 earthquake. J Geodesy Geodyn 23(3):66–69 ( in Chinese)
Zhu YQ, Hui L, Zhu G et al (2004) Gravity evolution and earthquake activities of the northeastern edge of Qinghai-Tibet block. Acta Seismol Sin 26(Supp):71–78 (in Chinese)
Zhu YQ, Liang W, Xu Y (2008) Medium-term prediction of Ms8.0 earthquake in Wenchuan, Sichuan by mobile gravity. Recent Dev World Seismol 7:36–39 (in Chinese)
Zhu YQ, Yunma X, Yipei L et al (2009) Relations between gravity variation of Longmenshan fault zone and Wenchuan Ms8.0 earthquake. Chin J Geophys 52(10):2538–2546 (in Chinese)
Zhu YQ, Zhan FB, Zhou J et al (2010) Gravity measurements and their variations before the 2008 Wenchuan earthquake. Bull Seism Soc Am 100(5B):2815–2824
Zhu YQ, Fang L, Guo S (2011) Temporal of gravity field before and after Wenchuan Ms8.0 earthquake. Geodesy Geodynamics 2(2):33–38
Zhu YQ, Liang W, Shi C et al (2012a) Study on mechanism of gravity field change in northeastern margin of Qinghai-Tibet plateau. J Geodesy Geodynamics 32(3):1–6 (in Chinese)
Zhu YQ, Liang WF, Zhan FB et al (2012b) Study on dynamic change of gravity field in China continent. Chin J Geophys 55(3):804–813 (in Chinese)
Zhu YQ, Xueze W, Heping S et al (2013) Gravity changes before the Lushan, Sichuan, Ms=7.0 earthquake of 2013. Chin J Geophys 56(6):1887–1894 (in Chinese)
Zhu YQ, Yunfeng Z, Fang L et al (2014) Gravity changes before Ms6.6 earthquake in boundary of Ximyuan and Hejing in Xinjiang. J Geodesy Geodynamics 34(1):4–7 (in Chinese)
Zhu YQ, Fang L, Tieming L et al (2015a) Dynamic variation of the gravity field in the Sichuan-Yunnan region and its implication for seismic risk. Chin J Geophys 58(11):4187–4196 (in Chinese)
Zhu YQ, Fang L, Xinzhao Y et al (2015b) Earthquake prediction from China’s mobile gravity data. GeodesyGeodynamics 6(2):81–90
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This research was jointly funded by the National major scientific instruments development project of China (61627824) and National Natural Science Foundation of China (41274083).
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Zhu, YQ., Liang, WF. & Zhang, S. Earthquake precursors: spatial-temporal gravity changes before the great earthquakes in the Sichuan-Yunnan area. J Seismol 22, 217–227 (2018). https://doi.org/10.1007/s10950-017-9700-2
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DOI: https://doi.org/10.1007/s10950-017-9700-2