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Liu Zhipeng and His Research on the 2016 Earthquake of Christchurch, New Zealand
26/03/2019 - Dr Liu Zhipeng and his colleagues of School of Earth and Space Sciences, Peking University, recently co-authored and published an article entitled “Utilizing Back-Projection Method Based on 3-D Global Tomography Model to Investigate Mw 7.8 New Zealand South Island Earthquake” in Acta Scientiarum Naturalium Universitatis Pekinensis, Vol. 54, No. 4 (July 2018).
Dr Liu Zhipeng and his colleagues of School of Earth and Space Sciences, Peking University, recently co-authored an article entitled “Utilizing Back-Projection Method Based on 3-D Global Tomography Model to Investigate Mw 7.8 New Zealand South Island Earthquake” (《利用基于全球三维模型的反投影方法研究2016 年Mw 7.8 级新西兰地震》), which was published in Acta Scientiarum Naturalium Universitatis Pekinensis, Vol. 54, No. 4 (July 2018).
Based on a 3-D global velocity structure model, the research project used teleseismic P wave data from Asian and South American array to image the rupture process of 2016 Mw 7.8 New Zealand earthquake via backprojection analysis. The results show that the rupture is a unilateral one with northeast direction, extending to the ocean. The rupture speed is about 1.65 km/s. There are two phases dominated by high frequency power radiation, occurring during 2040 s and 6080 s, respectively. The second phase is the major one, whose distribution of low frequency power radiation is consistent with the centroid location of the event. The high frequency back projection result of the South American data is better correlated with the peak ground acceleration result. According to the comparison and analysis of the Asian and South American results, it could be inferred that in order to obtain more detailed rupture information of high frequency, the data of array deployed in the region with lower 3-D heterogeneity should be adopted in back projection analysis to enhance the coherency of waveforms. |