Broadband dynamic rupture modeling with fractal fault roughness, frictional heterogeneity, viscoelasticity and topography: the 2016 Mw 6.2 Amatrice, Italy earthquake

Advances in physics-based earthquake simulations, utilizing high-performance computing, have been exploited to better understand the generation and characteristics of the high-frequency seismic wavefield. However, direct comparison to ground motion observations of a specific earthquake is challenging. We here propose a new approach to simulate data-fused broadband ground motion synthetics using 3D dynamic rupture modeling of the 2016 Mw 6.2 Amatrice, Italy earthquake. We augment a smooth, best-fitting model from Bayesian dynamic rupture source inversion of strong-motion data (<1 Hz) with fractal fault roughness, frictional heterogeneities, viscoelastic attenuation, and topography. The required consistency to match long periods allows us to quantify the role of small-scale dynamic source heterogeneities, such as the 3D roughness drag, from observational broadband seismic waveforms. We demonstrate that 3D data-constrained fully dynamic rupture synthetics show good agreement with various observed ground-motion metrics up to ∼5 Hz and are an important avenue toward non-ergodic, physics-based seismic hazard assessment.

@article{id2802,
  author = {Taufiqurrahman, Taufiq and Gabriel, Alice-Agnes and Ulrich, Thomas and Valentova, Lubica and Gallovic, Frantisek},
  doi = {https://doi.org/10.1029/2022GL098872},
  journal = {Geophysical Research Letters},
  language = {en},
  number = {22},
  pages = {e2022GL098872},
  title = {Broadband dynamic rupture modeling with fractal fault roughness, frictional heterogeneity, viscoelasticity and topography: the 2016 Mw 6.2 Amatrice, Italy earthquake},
  url = {https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2022GL098872},
  volume = {49},
  year = {2022},
}

%O Journal Article
%A Taufiqurrahman, Taufiq
%A Gabriel, Alice-Agnes
%A Ulrich, Thomas
%A Valentova, Lubica
%A Gallovic, Frantisek
%R https://doi.org/10.1029/2022GL098872
%J Geophysical Research Letters
%G en
%N 22
%P e2022GL098872
%T Broadband dynamic rupture modeling with fractal fault roughness, frictional heterogeneity, viscoelasticity and topography: the 2016 Mw 6.2 Amatrice, Italy earthquake
%U https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2022GL098872
%V 49
%D 2022