Numerical simulations are carried out for the dynamic rupture and wave propagation process of the 24th August 2016 ML 6.0 Amatrice, Italy, earthquake, using a boundary domain method (BDM), a hybrid method of boundary integral equation and finite difference methods. Dynamic rupture parameters of two seismogenic asperities are searched by iterative search through the comparison of the near-field ground motions. The preferred models indicate two asperities, aligned at around 4–5 km depth and separated from each other as well as from the initial rupture point. This requires a few supplementary patches connecting them, and that are less energetic than the asperities. The asperities are characterized by a radius of 2–3 km in the south (first to rupture) and of 2–4 km in the north (second to rupture), and the corresponding fracture energies of the asperities are (25.35 ± 0.63) × 1012 J and (38.05 ± 7.91) × 1012 J, respectively. These values are consistent with the scaling relation extrapolated from various analyses of large earthquakes. Although the parameter space of the search is limited due to the numerical performance of the dynamic rupture simulation, the proposed simple characterization of the earthquakes source confirms the scaling relation in fracture energy of the seismogenic asperities, which is essential for constructing mechanical earthquake source models.
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Seismological data is available from ITACA (Italian Accelerometric Archive) database from INGV homepage (http://itaca.mi.ingv.it), accessed on the 3rd July 2017. Finite source model is available on Finite-Source Rupture Model Database (http://equake-rc.info/SRCMOD/), accessed on the 6th June 2018. The other information is in the given references.
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We thank INGV for the recorded data and other useful information. We also thank E. Tinti and F. Gallovič for their precision on the kinematic models. Numerical simulations are carried out on French supercomputing center GENCI/CINES under the Grants A0030406700 and A0050406700. C.T. was funded by the Centre National d’Études Spatiales (CNES) as well as by the ANR JCJC E-POST (ANR-14-CE03-0002-01JCJC E-POST). The authors also thanks the editor Luis Dalguer as well as Andre Herrero and an anonymous reviewer for their constructive comments.
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Aochi, H., Twardzik, C. Imaging of Seismogenic Asperities of the 2016 ML 6.0 Amatrice, Central Italy, Earthquake Through Dynamic Rupture Simulations. Pure Appl. Geophys. 177, 1931–1946 (2020). https://doi.org/10.1007/s00024-019-02199-z
- 2016 Amatrice earthquake
- dynamic rupture simulation
- patch model
- fracture energy
- scaling law