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Meng Lingyuan, Shi Baoping, Liu Jie. 2013: Characteristics of strong ground motion from the sequence of New Zealand earthquake: 2010, MW7.0, main shock and 2011, MW6.1, aftershock. Acta Seismologica Sinica, 35(3): 351-368. DOI: 10.3969/j.issn.0253-3782.2013.03.007
Citation: Meng Lingyuan, Shi Baoping, Liu Jie. 2013: Characteristics of strong ground motion from the sequence of New Zealand earthquake: 2010, MW7.0, main shock and 2011, MW6.1, aftershock. Acta Seismologica Sinica, 35(3): 351-368. DOI: 10.3969/j.issn.0253-3782.2013.03.007
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Characteristics of strong ground motion from the sequence of New Zealand earthquake: 2010, MW7.0, main shock and 2011, MW6.1, aftershock

  • 1.

    College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China

  • 2.

    China Earthquake Network Center, Beijing 100045, China

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  • Received Date: April 17, 2012
  • Revised Date: July 23, 2012
  • Published Date: April 30, 2013
    Graphical Abstract
    • Abstract
  • The New Zealand earthquake of September 3, 2010, MW7.0 occurred in the South Island of New Zealand with depth of 10 km. The February 21, 2011, South Island, New Zealand, earthquake occurred as a part of the aftershock sequence of the 2010 MW7.0 mainshock (Darfield earthquake of 2010). This largest MW 6.1 aftershock (Christchurch earthquake of 2011) is significantly closer to the main population center of Christchurch, New Zealand, than is the September 2010 mainshock, however, violent MW6.1 aftershock was caused by movement along a fault that does not appear to have broken the surface. Considering the amplification of shallow velocity structure (vS30), we compared the observed horizontal PGAs (peak ground acceleration) and PGVs (peak ground velocity) of both the mainshock and aftershock with NGA (next generation attenuation), respectively. The near-field strong ground motion of the aftershock is higher than the observations of mainshock. For the New Zealand sequence, two special finite fault models, dynamical composite source model (DCSM) and scholastic finite-fault model (SFFM), are constructed for Darfield and Christchurch earthquake of 2010 and 2011, respectively. For comparison purpose, we also conducted the broadband ground motion predictions for the station of Heathcote Valley Primary School (HVSC) and Greendale station (GDLC), which are the nearest stations from the epicenter of mainshock and aftershock, respectively. We compared the advantage and limitation of the DCSM and SFFM, respectively, for developing appropriate technique to generate the shaking map in real time and for earthquake early warning.
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