EGU2020-7075
https://doi.org/10.5194/egusphere-egu2020-7075
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Multi-band imaging of seismic source rupture process

Hailin Du, Xu Zhang, and Yongzhe Wang
Hailin Du et al.
  • Institute of Geophysics, China Earthquake Administration, China (duhl@cea-igp.ac.cn)

The standard method to image the source rupture process of a large earthquake is finite fault inversion, which uses the low-frequency signal to invert the slip distribution of the fault. However, in different stages of the source rupture process of a large earthquake, the seismic waves radiated by the source have different dominant frequencies, such as high frequency seismic waves excited by the rupture front. If we can analyze seismic waves in different frequency bands, it is expected to obtain a more detailed source rupture process of large earthquakes. Therefore, we respectively adopted the high frequency signal back-projection imaging method and the low frequency signal finite fault inversion method, and took the 2016 Kaikoura MW7.8 earthquake as an example to obtain the history of rupture propagation and fault slip distribution.The calculated results show that the high-frequency energy radiation of the earthquake can be divided into three stages, and the low-frequency energy radiation can be divided into two stages. The energy release process in different frequency bands is complementary in time and space. The rupture process of the whole source can be explained by the asperity model and the barrier model.

How to cite: Du, H., Zhang, X., and Wang, Y.: Multi-band imaging of seismic source rupture process, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-7075, https://doi.org/10.5194/egusphere-egu2020-7075, 2020