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Jiang Yongzheng, Wang Hongwei, Ren Yefei, Wen Ruizhi. 2017: Rupture directivity effect of near-field ground motions in Italy MW6.2 earthquake on August 24， 2016. Acta Seismologica Sinica, 39(1): 132-142. DOI: 10.11939/jass.2017.01.011
Citation: Jiang Yongzheng, Wang Hongwei, Ren Yefei, Wen Ruizhi. 2017: Rupture directivity effect of near-field ground motions in Italy MW6.2 earthquake on August 24， 2016. Acta Seismologica Sinica, 39(1): 132-142. DOI: 10.11939/jass.2017.01.011
shu

Rupture directivity effect of near-field ground motions in Italy MW6.2 earthquake on August 24， 2016

  • 1.

    Institute of Engineering Mechanics， China Earthquake Administration， Harbin 150080， China

  • 2.

    Key Laboratory of Earthquake Engineering and Engineering Vibration， China Earthquake Administration， Harbin 150080， China

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  • Received Date: December 13, 2015
  • Revised Date: November 30, 2016
  • Published Date: December 31, 2016
    Graphical Abstract
    • Abstract
  • For investigating the rupture directivity effect of the central Italy MW6.2 earthquake on August 24， 2016， more than 150 strong motion stations are separated into two groups， which are SE and NW， according to the fault strike. Comparing the PGA， PGV， pseudo-acceleration response spectrum (PSA) and significant duration DSR of two groups， the results show that: the observed PGAs, PGVs and PSAs of NW group are larger than those of SE group; the residuals between the observed and predicted PGAs and PGVs are significantly correlated with the azimuth; the observed DSR of NW group is smaller than that of SE group. From these observations we deduce that the rupture directivity effect exists in this earthquake. Furthermore， the inversion for source rupture parameters using PGAs and PGVs, respectively， shows that the rupture is bilateral， and the MW6.2 earthquake predominantly ruptured in the direction 345°--360°， accounting for 70%--80% of the total rupture， and the rupture velocity is 2.2--2.5 km/s. These results validate the conclusion that the differences of ground motion parameters between two groups of stations might be caused by the rupture directivity effect.
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    • References (29)
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