Low-parametric modeling of the 2015, M-W 8.3 Illapel, Chile earthquake

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10388669" target="_blank" >RIV/00216208:11320/18:10388669 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jsames.2018.08.006" target="_blank" >http://dx.doi.org/10.1016/j.jsames.2018.08.006</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jsames.2018.08.006" target="_blank" >10.1016/j.jsames.2018.08.006</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Low-parametric modeling of the 2015, M-W 8.3 Illapel, Chile earthquake

Popis výsledku v původním jazyce

The M-W 8.3 (GCMT) Illapel megathrust earthquake is investigated. The objective is to find out which features of the previously published rupture scenarios can be resolved by using a regional strong-motion network (epicentral distances 130-260 km) and source models with a few parameters only. Low-frequency waveforms (&lt; 0.05 Hz) at nine stations (Centro Sismologico Nacional, Chile) are subjected to modeling. Various representations of the source are used: (i) multiple-point source models based either on iterative deconvolution or simultaneous inversion of source pairs, (ii) models of circular and elliptical uniform-slip patches, employing synthetic and empirical Green&apos;s functions, respectively. This variety of methods provides consistent results. The earthquake appears to be a segmented rupture progressing from an early (deep) moment release to a later (shallow) one, towards the northwest. The source models of slip-uniform patches synchronously suggest a low rupture speed of 1-2 km/s. Despite the different data sets and methods used in this study, the estimate of rupture speed is consistent with independent publications. As for ambiguity in literature regarding the depth and timing of the rupture, our paper clearly prefers the models including a similar to 20-30 s delay of the shallow moment release compared to the initial deep one. The strong-motion data set and low-parametric models proved to be competitive with more sophisticated approaches like multi-parameter slip models using a variety of regional geophysical observables. These results, together with the results from other studies for smaller events, show that strong-motion networks can be useful for studying rupture processes in a wide range of magnitudes, thus promoting the improvement of regional strong-motion networks in poorly instrumented regions.

Název v anglickém jazyce

Low-parametric modeling of the 2015, M-W 8.3 Illapel, Chile earthquake

Popis výsledku anglicky

The M-W 8.3 (GCMT) Illapel megathrust earthquake is investigated. The objective is to find out which features of the previously published rupture scenarios can be resolved by using a regional strong-motion network (epicentral distances 130-260 km) and source models with a few parameters only. Low-frequency waveforms (&lt; 0.05 Hz) at nine stations (Centro Sismologico Nacional, Chile) are subjected to modeling. Various representations of the source are used: (i) multiple-point source models based either on iterative deconvolution or simultaneous inversion of source pairs, (ii) models of circular and elliptical uniform-slip patches, employing synthetic and empirical Green&apos;s functions, respectively. This variety of methods provides consistent results. The earthquake appears to be a segmented rupture progressing from an early (deep) moment release to a later (shallow) one, towards the northwest. The source models of slip-uniform patches synchronously suggest a low rupture speed of 1-2 km/s. Despite the different data sets and methods used in this study, the estimate of rupture speed is consistent with independent publications. As for ambiguity in literature regarding the depth and timing of the rupture, our paper clearly prefers the models including a similar to 20-30 s delay of the shallow moment release compared to the initial deep one. The strong-motion data set and low-parametric models proved to be competitive with more sophisticated approaches like multi-parameter slip models using a variety of regional geophysical observables. These results, together with the results from other studies for smaller events, show that strong-motion networks can be useful for studying rupture processes in a wide range of magnitudes, thus promoting the improvement of regional strong-motion networks in poorly instrumented regions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Journal of South American Earth Sciences

ISSN

0895-9811

e-ISSN

—

Svazek periodika

88

Číslo periodika v rámci svazku

December 2018

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

144-156

Kód UT WoS článku

000452946100012

EID výsledku v databázi Scopus

2-s2.0-85052456612