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DTSTART;TZID=Europe/Rome:20260622T160000
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DTSTAMP:20260615T095620Z
CREATED:20260615T095341Z
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UID:33441-1782144000-1782147600@www.dica.polimi.it
SUMMARY:Seismic Wave Propagation in Complex Geological Domains: From Site Effects in Earthquakes to Diffuse Fields in Passive Seismology
DESCRIPTION:Within the PhD course on Elastic Wave Propagation with applications to Earthquake Engineering at Politecnico di Milano\, Prof. Francisco José Sánchez-Sesma\, Instituto de Ingeniería\, UNAM México\, will deliver a lecture on Seismic Wave Propagation in Complex Geological Domains: From Site Effects in Earthquakes to Diffuse Fields in Passive Seismology. \n  \n\nThe lecture will be delivered on June 22\, 2026\, at 16:00 (Italian time) in the Webex personal room: politecnicomilano.webex.com/meet/roberto.paolucci\nThis will be a repetition of the Joyner Memorial Lecture\, awarded jointly by the Earthquake Engineering Research Institute (EERI) and the Seismological Society of America (SSA)\, which recognizes outstanding individuals working at the intersection of earthquake science and engineering\, whether it involves contributions from earthquake science to earthquake engineering\, or from earthquake engineering to earthquake science. For 20 years\, these distinguished speakers have contributed to building codes\, seismic design guidelines\, probabilistic seismic hazard analysis\, and the characterization of site effects. Francisco José Sánchez-Sesma of the Universidad Nacional Autónoma de México (UNAM) delivered the 2026 Joyner Lecture at the SSA Annual Meeting in Pasadena\, CA\, and will do so again at the 13NCEE in Portland\, OR.\n\nAbstract\nThis lecture emerges from decades of research on seismic waves in complex geological media to assess ground motion\, from strong shaking to weak ambient vibrations such as microtremors and seismic noise. It is dedicated to William B. Joyner\, who bridged the gap between seismologists and engineers to achieve an earthquake-resilient society. Personally\, the 1985 Michoacán earthquake (Mw 8.1)\, which caused catastrophic damage in Mexico City\, was a key motivation. The Random Vibration Theory\, reformulated by Boore and Joyner\, helped us to craft the Mexico City building code\, which incorporated the Fourier spectrum as a design concept. Seismic hazard is a big puzzle; we take little pieces and try to solve each one. The Indirect Boundary Element Method (IBEM) enabled the study of the seismic response of topographic features and alluvial valleys to educate the intuition. The need for a geomorphological description is evident. Diffuse fields allowed us to establish the exact retrieval of Green’s functions from noise cross-correlations. This leads to a theory for the H/V spectral ratio to model ambient seismic noise measurements and infer subsurface layered structures. However\, including lateral irregularity is a major challenge. Preliminary results suggest it is possible to spot\, from H/V results\, zones that may trap energy in earthquakes.
URL:https://www.dica.polimi.it/it/evento/seismic-wave-propagation-in-complex-geological-domains-from-site-effects-in-earthquakes-to-diffuse-fields-in-passive-seismology/
LOCATION:collegamento Webex
CATEGORIES:Webinar e Workshop
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