The Linked Complexity of Coseismic and Postseismic Faulting Revealed by Seismo‐Geodetic Dynamic Inversion of the 2004 Parkfield Earthquake

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10488402" target="_blank" >RIV/00216208:11320/24:10488402 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2024JB029410" target="_blank" >10.1029/2024JB029410</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Linked Complexity of Coseismic and Postseismic Faulting Revealed by Seismo‐Geodetic Dynamic Inversion of the 2004 Parkfield Earthquake

Popis výsledku v původním jazyce

Several regularly recurring moderate-size earthquakes motivated dense instrumentation of theParkfield section of the San Andreas fault (SAF), providing an invaluable near-fault observatory. We present aseismo-geodetic dynamic inversion of the 2004 Parkfield earthquake, which illuminates the interlinkedcomplexity of faulting across time scales. Using fast-velocity-weakening rate-and-state friction, we jointlymodel coseismic dynamic rupture and the 90-day evolution of postseismic slip in a 3D domain. We utilize aparallel tempering Markov chain Monte Carlo approach to solve this non-linear high-dimensional inverseproblem, constraining spatially varying prestress and fault friction parameters by 30 strong motion and 12 GPSstations. From visiting &gt;2 million models, we discern complex coseismic rupture dynamics that transition froma strongly radiating pulse-like phase to a mildly radiating crack-like phase. Both coseismic phases are separatedby a shallow strength barrier that nearly arrests rupture and leads to a gap in the afterslip, reflecting the geologicheterogeneity along this segment of the SAF. Coseismic rupture termination involves distinct arrest mechanismsthat imprint on afterslip kinematics. A backward propagating afterslip front may drive delayed aftershockactivity above the hypocenter. Trade-off analysis of the 10,500 best-fitting models uncovers local correlationsbetween prestress levels and the reference friction coefficient, alongside an anticorrelation between prestressand rate-state parameters b a. We find that a complex, fault-local interplay of dynamic parametersdetermines the nucleation, propagation, and arrest of both, co- and postseismic faulting. This study demonstratesthe potential of inverse physics-based modeling to reveal novel insights and detailed characterizations of well-recorded earthquakes.

Název v anglickém jazyce

The Linked Complexity of Coseismic and Postseismic Faulting Revealed by Seismo‐Geodetic Dynamic Inversion of the 2004 Parkfield Earthquake

Popis výsledku anglicky

Several regularly recurring moderate-size earthquakes motivated dense instrumentation of theParkfield section of the San Andreas fault (SAF), providing an invaluable near-fault observatory. We present aseismo-geodetic dynamic inversion of the 2004 Parkfield earthquake, which illuminates the interlinkedcomplexity of faulting across time scales. Using fast-velocity-weakening rate-and-state friction, we jointlymodel coseismic dynamic rupture and the 90-day evolution of postseismic slip in a 3D domain. We utilize aparallel tempering Markov chain Monte Carlo approach to solve this non-linear high-dimensional inverseproblem, constraining spatially varying prestress and fault friction parameters by 30 strong motion and 12 GPSstations. From visiting &gt;2 million models, we discern complex coseismic rupture dynamics that transition froma strongly radiating pulse-like phase to a mildly radiating crack-like phase. Both coseismic phases are separatedby a shallow strength barrier that nearly arrests rupture and leads to a gap in the afterslip, reflecting the geologicheterogeneity along this segment of the SAF. Coseismic rupture termination involves distinct arrest mechanismsthat imprint on afterslip kinematics. A backward propagating afterslip front may drive delayed aftershockactivity above the hypocenter. Trade-off analysis of the 10,500 best-fitting models uncovers local correlationsbetween prestress levels and the reference friction coefficient, alongside an anticorrelation between prestressand rate-state parameters b a. We find that a complex, fault-local interplay of dynamic parametersdetermines the nucleation, propagation, and arrest of both, co- and postseismic faulting. This study demonstratesthe potential of inverse physics-based modeling to reveal novel insights and detailed characterizations of well-recorded earthquakes.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

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

2024

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

30

Strana od-do

1-30

Kód UT WoS článku

001371400900001

EID výsledku v databázi Scopus

2-s2.0-85211169639