Broadband Strong Ground Motion Modeling Using Planar Dynamic Rupture With Fractal Parameters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10473648" target="_blank" >RIV/00216208:11320/23:10473648 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=zsjf0Ui.aw" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=zsjf0Ui.aw</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2023JB026506" target="_blank" >10.1029/2023JB026506</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Broadband Strong Ground Motion Modeling Using Planar Dynamic Rupture With Fractal Parameters

Popis výsledku v původním jazyce

Dynamic rupture modeling represents a promising physics-based approach to strong ground motion simulations. However, its application in a broad frequency range (0-10 Hz), interesting for engineering studies, is challenging. The main reason is that widely used and relatively simple planar fault models with smooth distributions of initial stress and frictional parameters, or even self-similar initial stress, result in ground motions depleted in high-frequency content. Here we propose an efficient approach for the linear slip-weakening friction model on a planar fault based on the Ide and Aochi (2005, ) multiscale model with a small-scale random fractal distribution of the slip-weakening distance D-c. We propose a way to combine these variations with a large-scale deterministic dynamic model. We illustrate the approach on an elliptical model and a smooth model of the 2016 M-w 6.2 Amatrice, Italy, earthquake from low-frequency dynamic rupture inversion. To intensify the incoherence of the rupture propagation, we also include a variation of the strength and initial stress, both correlated with D-c. These additions result in sustained high-frequency radiation during the whole rupture propagation and omega-square source time functions. The new model of the Amatrice earthquake generates synthetics that agree with the local ground motion model up to 5 Hz in terms of spectral accelerations while preserving the average and integral dynamic rupture parameters (e.g., stress drop, fracture and radiated energy). The fractal dynamic model can be easily implemented in any dynamic rupture propagation code and is thus readily applicable in broadband physics-based ground motion predictions for earthquake scenarios in seismic hazard assessment.

Název v anglickém jazyce

Broadband Strong Ground Motion Modeling Using Planar Dynamic Rupture With Fractal Parameters

Popis výsledku anglicky

Dynamic rupture modeling represents a promising physics-based approach to strong ground motion simulations. However, its application in a broad frequency range (0-10 Hz), interesting for engineering studies, is challenging. The main reason is that widely used and relatively simple planar fault models with smooth distributions of initial stress and frictional parameters, or even self-similar initial stress, result in ground motions depleted in high-frequency content. Here we propose an efficient approach for the linear slip-weakening friction model on a planar fault based on the Ide and Aochi (2005, ) multiscale model with a small-scale random fractal distribution of the slip-weakening distance D-c. We propose a way to combine these variations with a large-scale deterministic dynamic model. We illustrate the approach on an elliptical model and a smooth model of the 2016 M-w 6.2 Amatrice, Italy, earthquake from low-frequency dynamic rupture inversion. To intensify the incoherence of the rupture propagation, we also include a variation of the strength and initial stress, both correlated with D-c. These additions result in sustained high-frequency radiation during the whole rupture propagation and omega-square source time functions. The new model of the Amatrice earthquake generates synthetics that agree with the local ground motion model up to 5 Hz in terms of spectral accelerations while preserving the average and integral dynamic rupture parameters (e.g., stress drop, fracture and radiated energy). The fractal dynamic model can be easily implemented in any dynamic rupture propagation code and is thus readily applicable in broadband physics-based ground motion predictions for earthquake scenarios in seismic hazard assessment.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

<a href="/cs/project/GA23-06345S" target="_blank" >GA23-06345S: Seismo-geodynamické modelování Helénské subdukce</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Geophysical Research: Solid Earth

ISSN

2169-9313

e-ISSN

2169-9356

Svazek periodika

128

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

23

Strana od-do

e2023JB026506

Kód UT WoS článku

001000301500001

EID výsledku v databázi Scopus

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