Volume 45 Issue 1
Jan.  2023
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Zhao Y H,Su W G,Feng L L,Li X,Liu L,Sun X H. 2023. Characteristics of the dominant azimuth anomalies of geoelectric field at Dawu station before MS7.4 Maduo,Qinghai earthquake in 2021. Acta Seismologica Sinica,45(1):76−83 doi: 10.11939/jass.20210162
Citation: Zhao Y H,Su W G,Feng L L,Li X,Liu L,Sun X H. 2023. Characteristics of the dominant azimuth anomalies of geoelectric field at Dawu station before MS7.4 Maduo,Qinghai earthquake in 2021. Acta Seismologica Sinica45(1):76−83 doi: 10.11939/jass.20210162

Characteristics of the dominant azimuth anomalies of geoelectric field at Dawu station before MS7.4 Maduo,Qinghai earthquake in 2021

doi: 10.11939/jass.20210162
  • Received Date: 2021-10-20
  • Rev Recd Date: 2022-05-20
  • Available Online: 2023-01-04
  • Publish Date: 2023-01-17
  • In order to know whether there were seismic electrical signals before MS7.4 Maduo, Qinghai earthquake on 22 May 2021, this paper analyzed the original data of geoelectric field from Dawu seismic station by using the dominant azimuth method, and the variation characteristics of rockmass fracture structure before the MS7.4 Maduo earthquake were obtained. Furthermore, the rockmass frasture structure characteristics of eight geoelectric stations within 500 km of the earthquake and previous related earthquake cases are comprehensively analyzed. The results show that the geoelectric field dominant azimuths of the two observation sites at Dawu had a significantly synchronous deflection phenomenon eleven months before the earthquake, and the geoelectric field of one site increased sharply again one month before the earthquake. The abnormal characteristics of the site are mainly manifested as the rapid deflection of the jump range of the dominant azimuth, with the maximum deflection reaching 45°−90°. Additionally, the stations Garze and Maqu in the same secondary block showed quasisynchronous changes with the Dawu station, while the stations in other secondary blocks showed no anomalies, indicating that the abnormal responses are affected by regional tectonic settings. And combined with the previous earthquake case analyses, it is deduced that the dominant azimuth anomaly based on the Dawu electric field has good prediction efficiency for the short and medium term earthquake.


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  • [1]
    Yisimayili A,Chen J H,Mao Z Q. 2020. Geoelectric anomalies before the two M6 earthquakes in northern Tianshan in 2016−2017[J]. Chinese Journal of Radio Science,35(3):430–436 (in Chinese).
    An Z H,Gao Y,Fan Y Y,Liu J,Wang J J. 2017. Review and prospect for the harmonic resonance waves of geo-electricity driven by tidal forces[J]. Progress in Geophysics,32(1):1–7 (in Chinese).
    Chen Q,An Z H,Fan Y Y. 2019. Statistical evidence of tidal triggered earthquakes in North and South Seismic Belt[J]. Progress in Geophysics,34(5):1714–1720 (in Chinese).
    Fan Y Y,Du X B,Jacques Z,Tan D C,Liu J,An Z H,Chen J Y,Zheng G L,Xie T. 2010. The electromagnetic phenomena before the MS8.0 Wenchuan earthquake[J]. Chinese Journal of Geophysics,53(12):2887–2898 (in Chinese).
    Huang Q H. 2005. The state-of-the-art in seismic electromagnetic observation[J]. Developments in World Seismology,(11):4–7 (in Chinese).
    Huang Q H,Liu T. 2006. Earthquakes and tide response of geoelectric potential field at the Niijima station[J]. Chinese Journal of Geophysics,49(6):1745–1754 (in Chinese).
    Ma Q Z. 2008. Multi-dipole observation system and study on the abnormal variation of the geoelectric field observed at Capital Network before the 2006 Wen’an,Hebei of China,MS5.1 earthquake[J]. Acta Seismologica Sinica,30(6):615–625 (in Chinese).
    Mao T E,Xi J L,Wang Y Q,Yin S Z. 1999. The variation characteristics of the telluric field in the process of earthquake[J]. Chinese Journal of Geophysics,42(4):520–528 (in Chinese).
    Qian F Y,Zhao Y L. 2005. Study on geoelectric field method for short-term and impending earthquake prediction[J]. Earthquake,25(2):33–40 (in Chinese).
    Tan D C,Zhao J L,Xi J L,Du X B,Xu J M. 2010. A study on feature and mechanism of the tidal geoelectrical field[J]. Chinese Journal of Geophysics,53(3):544–555 (in Chinese).
    Tan D C,Wang L W,Zhao J L,Xi J L,Liu D P,Yu H,Chen J Y. 2011. Influence factors of harmonic waves and directional waveforms of tidal geoelectrical field[J]. Chinese Journal of Geophysics,54(7):1842–1853 (in Chinese).
    Tan D C,Zhao J L,Xi J L,Liu D P,An Z H. 2012. The variation of waveform and analysis of composition for the geoelectrical field before moderate or strong earthquakes in Qinghai-Tibetan Plateau regions[J]. Chinese Journal of Geophysics,55(3):875–885 (in Chinese).
    Tan D C,Xi J L,Zhang H,Wang L W,Fan Y Y,An H J. 2013. Hydrogeologic factors of geoelectric field and diurnal computation of preferred orientation of crack water seepage[J]. Acta Seismologica Sinica,35(1):36–49 (in Chinese).
    Tan D C,Xin J C,Wang J J,Fan Y Y,Wang W M. 2019. Application foundation and earthquake case analysis of the telluric field rock crack model[J]. Chinese Journal of Geophysics,62(2):558–571 (in Chinese).
    Tian S,Wang J G,Xu X G,Dong H J,Cui X F,Ma J. 2009. Research on the technique of extracting seismic precursory anomaly from telluric electric field observation[J]. Acta Seismologica Sinica,31(4):424–431 (in Chinese).
    Xi J L. 2019. A review of geoelectric field observation methods and techniques[J]. Seismological and Geomagnetic Observation and Research,40(2):1–20 (in Chinese).
    Xin J C,Tan D C,Zhao F,Zhang Y F,Li X S. 2017. Calculation of preferred orientation of rock cracks influenced by typical interferences[J]. Earthquake,37(4):112–122 (in Chinese).
    Ye Q,Du X B,Zhou K C,Li N,Ma Z H. 2007. Spectrum characteristics of geoelectric field variation[J]. Acta Seismologica Sinica,29(4):382–390 (in Chinese).
    Zhan Y. 2008. Deep Electric Structures Beneath the Northeastern Margin of the Tibetan Plateau and Its Tectonic Implications[D]. Beijing: Institute of Geology, China Earthquake Administration: 60–61 (in Chinese).
    Zhang B,Tan D C,Luo N,Yin X B,Wu H S. 2020. Interference analysis of HVDC transmission to electric field observation of Dabaishe station[J]. Earthquake,40(1):140–150 (in Chinese).
    Varotsos P,Alexopoulos K. 1984a. Physical properties of the variations of the electric field of the earth preceding earthquakes,I[J]. Tectonophysics,110(1/2):73–98.
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