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Ye Q D，Yan C H，Wang S W，Mao Y F，Yu D X，Yan L L. 2018. Crustal 2-D QS tomography in Longtan reservoir，Guangxi region. Acta Seismologica Sinica，40（6）：689−700. doi：10.11939/jass.20170227. DOI: 10.11939/jass.20170227
Citation: Ye Q D，Yan C H，Wang S W，Mao Y F，Yu D X，Yan L L. 2018. Crustal 2-D QS tomography in Longtan reservoir，Guangxi region. Acta Seismologica Sinica，40（6）：689−700. doi：10.11939/jass.20170227. DOI: 10.11939/jass.20170227
shu

Crustal 2-D QS tomography in Longtan reservoir，Guangxi region

  • 1.

    The First Monitoring and Application Center，China Earthquake Administration，Tianjin 300180，China

  • 2.

    Earthquake Agency of Guangxi Zhuang Autonomous Region，Nanning 530022，China

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  • Received Date: December 27, 2017
  • Revised Date: June 04, 2018
  • Available Online: November 04, 2018
  • Published Date: October 31, 2018
    Graphical Abstract
    • Abstract
  • In this study, we collected digital waveform records of 3 382 seismic events with ML≥0 recorded by Longtan reservoir induced-earthquake monitoring network in Guangxi region from September of 2006 to December of 2016 and these data have been precisely located. By using 2-D attenuation tomography technique, we extracted the 2-D QS tomography of Longtan reservoir area. The result show that there is a significant lateral heterogeneity in QS distribution in Longtan reservoir area. Approximately, there are low QS value annular regions surrounding the reservoir, and most of the low QS value regions are located at the intersections of rivers and fault zones. From the point of view of lithology, the main distribution of the low QS value corresponds to the lithologic area with strong permeability. All the above phenomena may indicate that the low QS value regions are affected by reservoir water, fault zones, and the lithology. The preliminary conclusion is: the reservoir water infiltrates through rock fracture zones, joints and crack regions of faults, as well as the regions of rock stratum with strong permeability, filling with fluid in the rock pores, increasing the internal friction, and causing significant attenuation of seismic wave, resulting in the decline of QS value. The result also shows that most of the earthquakes occurred at the transitional edge regions of high and low QS. This is perhaps a result of accumulation of strain energy in the transitional regions of hard and weak medium zones. Due to the loading effect of water mass and the lubrication effect on the crack boundary of the water in the high and low QS transition region, the shear strength of the seismogenic faults is decreased, leading to the relative sliding easily and inducing earthquakes.
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