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地球与行星物理

ISSN  2096-3955

CN  10-1502/P

Citation: HaiLin Du, Xu Zhang, LiSheng Xu, WanPeng Feng, Lei Yi, Peng Li, 2018: Source complexity of the 2016 MW7.8 Kaikoura (New Zealand) earthquake revealed from teleseismic and InSAR data, Earth and Planetary Physics, 2, 310-326. doi: 10.26464/epp2018029

2018, 2(4): 310-326. doi: 10.26464/epp2018029

SOLID EARTH: SEISMOLOGY

Source complexity of the 2016 MW7.8 Kaikoura (New Zealand) earthquake revealed from teleseismic and InSAR data

1. 

Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

2. 

Canada Center for Mapping and Earth Observation, Natural Resources Canada, Ottawa, K1A0E4, Canada

3. 

School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China

4. 

College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

Corresponding author: LiSheng Xu, xuls@cea-igp.ac.cn

Received Date: 2018-05-09
Web Publishing Date: 2018-07-01

On November 13, 2016, an MW7.8 earthquake struck Kaikoura in South Island of New Zealand. By means of back-projection of array recordings, ASTFs-analysis of global seismic recordings, and joint inversion of global seismic data and co-seismic InSAR data, we investigated complexity of the earthquake source. The result shows that the 2016 MW7.8 Kaikoura earthquake ruptured about 100 s unilaterally from south to northeast (~N28°–33°E), producing a rupture area about 160 km long and about 50 km wide and releasing scalar moment 1.01×1021 Nm. In particular, the rupture area consisted of two slip asperities, with one close to the initial rupture point having a maximal slip value ~6.9 m while the other far away in the northeast having a maximal slip value ~9.3 m. The first asperity slipped for about 65 s and the second one started 40 s after the first one had initiated. The two slipped simultaneously for about 25 s. Furthermore, the first had a nearly thrust slip while the second had both thrust and strike slip. It is interesting that the rupture velocity was not constant, and the whole process may be divided into 5 stages in which the velocities were estimated to be 1.4 km/s, 0 km/s, 2.1 km/s, 0 km/s and 1.1 km/s, respectively. The high-frequency sources distributed nearly along the lower edge of the rupture area, the high-frequency radiating mainly occurred at launching of the asperities, and it seemed that no high-frequency energy was radiated when the rupturing was going to stop.

Key words: 2016 MW7.8 Kaikoura earthquake, back-projection of array recordings, ASTFs-analysis of global recordings, joint inversion of teleseismic and InSAR data, complexity of source

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Source complexity of the 2016 MW7.8 Kaikoura (New Zealand) earthquake revealed from teleseismic and InSAR data

HaiLin Du, Xu Zhang, LiSheng Xu, WanPeng Feng, Lei Yi, Peng Li