IGPP is pleased to invite you to join its Fall 2023 Seminar Series presentation featuring Charles University's Frantisek Gallovic. Dr. Gallovic's talk, "From dynamic earthquake rupture inversions to broadband ground motion modeling, with real-world applications" will occur at 12pm October 17, 2023.
Time: 12:00 pm, Pacific Time
Location: Munk Conference Room and Zoom https://ucsd.zoom.us/j/93654851631?pwd=eHBzVkRxN3ZZZllxNHlmWXdRZjdEUT09 (password: igpp)
Abstract: Broadband earthquake ground-motion modeling based on low-frequency dynamic source inversions is becoming possible thanks to increasing computational power and development of tailor-made efficient numerical codes. I will present our dynamic rupture inversions applied to local low-frequency (<1 Hz) strong-motion waveforms of the 2016 Mw6.2 Amatrice, Italy, and the 2020 Mw6.8 Elazig, Türkiye, earthquakes, and a preliminary dynamic inversion of apparent source time functions of the 2010 Mw6.8 570-km deep earthquake in Northeastern China. Extending the dynamic modeling to high frequencies (0-10 Hz) is challenging because the inferred dynamic rupture models are smooth and characterized by depleted high-frequency ground motion content. To remedy this issue, I will present our recently published technique to enrich the dynamic models with small-scale random fractal perturbations in fracture energy and initial stress. The random perturbations preserve large-scale characteristics of the original model and introduce small-scale abrupt changes in rupture velocity, including local supershear propagation. The approach improves the fit to the recordings of the Amatrice earthquake and Central Italy ground motion model up to 10 Hz, and is readily implemented in physics-based earthquake rupture modeling for seismic hazard applications.
Prof. Gallovič’s website for more information: https://geo.mff.cuni.cz/~gallovic/