Abstract
Strong ground motion simulations require physically plausible earthquake source model. Here, I present the application of such a kinematic model introduced originally by Ruiz et al. (Geophys J Int 186:226–244, 2011). The model is constructed to inherently provide synthetics with the desired omega-squared spectral decay in the full frequency range. The source is composed of randomly distributed overlapping subsources with fractal number-size distribution. The position of the subsources can be constrained by prior knowledge of major asperities (stemming, e.g., from slip inversions), or can be completely random. From earthquake physics point of view, the model includes positive correlation between slip and rise time as found in dynamic source simulations. Rupture velocity and rise time follows local S-wave velocity profile, so that the rupture slows down and rise times increase close to the surface, avoiding unrealistically strong ground motions. Rupture velocity can also have random variations, which result in irregular rupture front while satisfying the causality principle. This advanced kinematic broadband source model is freely available and can be easily incorporated into any numerical wave propagation code, as the source is described by spatially distributed slip rate functions, not requiring any stochastic Green’s functions. The source model has been previously validated against the observed data due to the very shallow unilateral 2014 Mw6 South Napa, California, earthquake; the model reproduces well the observed data including the near-fault directivity (Seism Res Lett 87:2–14, 2016). The performance of the source model is shown here on the scenario simulations for the same event. In particular, synthetics are compared with existing ground motion prediction equations (GMPEs), emphasizing the azimuthal dependence of the between-event ground motion variability. I propose a simple model reproducing the azimuthal variations of the betweenevent ground motion variability, providing an insight into possible refinement of GMPEs’ functional forms.
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Aki, K., & Richards, P. G. (2002). Quantitative seismology. Sausalito, California: University Science.
Ameri, G., Gallovič, F., & Pacor, F. (2012). Complexity of the Mw6.3 2009 L’Aquila (Central Italy) earthquake: 2. Broadband strong-motion modeling. Journal Geophysical Research, 117, B04308. https://doi.org/10.1029/2011JB008729.
Andrews, D. J. (1980). A stochastic fault model: 1. static case. Journal Geophysical Research, 85, 3867–3877.
Ben-Menahem, A. (1961). Radiation of seismic surface waves from finite moving sources. Bulletin of the Seismological Society of America, 51, 401–435.
Bernard, P., Herrero, A., & Berge, C. (1996). Modeling directivity of heterogeneous earthquake ruptures. Bulletin of the Seismological Society of America, 86, 1149–1160.
Boore, D. M., Stewart, J. P., Seyhan, E., & Atkinson, G. M. (2014). NGA-West 2 equations for predicting PGA, PGV, and 5%- damped PSA for shallow crustal earthquakes. Earthquake Spectra, 30, 1057–1085.
Bouchon, M. (1981). A simple method to calculate Green’s functions for elastic layered media’’. Bulletin of the Seismological Society of America, 71, 959–971.
Brocher, T. M., et al. (2015). TheM6.0 24 August 2014 South Napa Earthquake’’. Seismological Research Letters, 86, 309–326.
Brune, J. N. (1970). Tectonic stress and the spectra of seismic shear waves from earthquakes. Journal Geophysical Research, 75, 4997–5009.
Causse,M.,&Song, S. G. (2015).Are stress drop and rupture velocity of earthquakes independent? Insight from observed ground motion variability. Geophysical Research Letters, 42, 7383–7389.
Convertito, V., De Matteis, R., & Emolo, A. (2016). Investigating Triggering of the Aftershocks of the 2014 Napa Earthquake. Bulletin of the Seismological Society of America, 106, 2063–2070.
Coutant, O. (1989). Program of numerical simulation AXITRA’’, research report. Grenoble, France: Lab. de Geophys. Interne et Tectonophys.
Day, S. M., Gonzalez, S. H., Anooshehpoor, R., & Brune, J. N. (2008). Scale-model and numerical simulations of near-fault seismic directivity. Bulletin of the Seismological Society of America, 98(3), 1186–1206.
Dreger, D. S., Huang, M.-H., Rodgers, A., Taira, T., & Wooddell, K. (2015). Kinematic finite-source model for the 24 August 2014 South Napa, California, earthquake from joint inversion of seismic, GPS and InSAR data. Seismological Research Letters, 86, 327–334.
Gallovič, F. (2016).Modeling velocity recordings of theMw6.0 South Napa, California, earthquake: unilateral event with weak high-frequency directivity. Seismological Research Letters, 87, 2–14.
Gallovič, F., & Brokešová, J. (2007). Hybrid k-squared source model for strong ground motion simulations: introduction. Physics of the Earth and Planetary Interiors, 160, 34–50.
Gallovič, F., & Burjánek, J. (2007). High-frequency directivity in strong ground motion modeling methods. Annals of Geophysics 50(2), 203–211.
Gallovič, F., Imperatori, W., & Mai, P. M. (2015). Effects of threedimensional crustal structure and smoothing constraint on earthquake slip inversions: case study of the Mw6.3 2009 L’Aquila earthquake. Journal Geophysical Research, 120, 428–449.
Graves, R. W., & Pitarka, A. (2010). Broadband ground-motion simulation using a hybrid approach. Bulletin of the Seismological Society of America, 100, 2095–2123.
Imperatori, W., & Mai, M. P. (2012). Broad-band near-field ground motion simulations in 3-dimensional scattering media. Geophysical Journal International, 192(2), 725–744.
Imtiaz, A., Causse, M., Chaljub, E., & Cotton, F. (2015). Is groundmotion variability distance-dependent? Insight from finite-source rupture simulations. Bulletin of the Seismological Society of America, 105, 950–962.
Ji, Ch., Archuleta, R. J., & Twardzik, C. (2015). Rupture history of 2014 Mw 6.0 South Napa earthquake inferred from near fault strong motion data and its impact to the practice of ground strong motion prediction. Geophysical Reseach Letters, 42, 2149–2156.
Melgar, D., Geng, J., Crowell, B. W., Haase, J. S., Bock, Y., Hammond, W. C., et al. (2015). Seismogeodesy of the 2014 Mw6.1 Napa earthquake, California: rapid response and modeling of fast rupture on a dipping strike-slip fault. Journal of Geophysical Research: Solid Earth, 120, 5013–5033.
Pacor, F., Gallovič, F., Puglia, R., Luzi, L., & D’Amico, M. (2016). Diminishing high-frequency directivity due to a source effect: empirical evidence from small earthquakes in the Abruzzo region, Italy. Geophysical Reseach Letters, 43, 5000–5008.
Podvin, P., & Lecomte, I. (1991). Finite difference computation of traveltimes in very contrasted velocity models: a massively parallel approach and its associated tool. Geophysical Journal International, 105, 271–284.
Ruiz, J. A., Baumont, D., Bernard, P., & Berge-Thierry, C. (2011). Modeling directivity of strong ground motion with a fractal, k-2, kinematic source model. Geophysical Journal International, 186, 226–244.
Sato, H., Fehler, M., & Maeda, T. (2012). Seismic wave propagation and scattering in the heterogeneous earth structure (2nd ed.). Berlin: Springer.
Schmedes, J., Archuleta, R. J., & Lavallée, D. (2010). Correlation of earthquake source parameters inferred from dynamic rupture simulations. Journal Geophysical Research, 115, B03304.
Somerville, P., Smith, N. F., Graves, W., & Abrahamson, N. (1997). Modification of empirical strong ground motion attenuation relations to include the amplitude and duration effects of rupture directivity. Seismological Research Letters, 68, 199–222.
Stidham, C., Antolik, M., Dreger, D., Larsen, S., & Romanowicz, B. (1999). Three-dimensional structure influences on the strong motion wavefield of the 1989 Loma Prieta earthquake. Bulletin of the Seismological Society of America, 89, 1184–1202.
Vyas, J Ch., Mai, P. M., & Galis, M. (2016). Distance and azimuthal dependence of ground-motion variability for unilateral strike-slip ruptures. Bulletin of the Seismological Society of America, 106,1584–1599.
Wei, S., Barbot, S., Graves, R., Lienkaemper, J. J., Wang, T., Hudnut, K., et al. (2015). The 2014 Mw 6.1 South Napa earthquake: a unilateral rupture with shallow asperity and rapid afterslip. Seismological Research Letters, 86, 344–354.
Zeng, Y., Anderson, J. G., & Yu, G. (1994). A composite source model for computing realistic synthetic strong ground motions. Geophysical Reseach Letters, 21, 725–728.
Acknowledgements
I acknowledge the reviews provided by the two anonymous reviewers who helped to improve the manuscript. Accelerometric data were downloaded from the freely available online repository Center for Engineering Strong Motion Data (CESMD, http://strongmotioncenter.org). Map figures were prepared using the Generic Mapping Tools package (http://www.soest.hawaii.edu/gmt/). Financial support: Grant Agency of Czech Republic 14-04372S.
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Gallovič, F. (2018). Azimuthal Dependence of the Ground Motion Variability from Scenario Modeling of the 2014 Mw6.0 South Napa, California, Earthquake Using an Advanced Kinematic Source Model. In: Dalguer, L., Fukushima, Y., Irikura, K., Wu, C. (eds) Best Practices in Physics-based Fault Rupture Models for Seismic Hazard Assessment of Nuclear Installations. Pageoph Topical Volumes. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-72709-7_9
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