Validation of 3D Velocity Models Using Earthquakes with Shallow Slip: Case Study of the 2014 M-w 6.0 South Napa, California, Event

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10366882" target="_blank" >RIV/00216208:11320/17:10366882 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1785/0120160041" target="_blank" >http://dx.doi.org/10.1785/0120160041</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1785/0120160041" target="_blank" >10.1785/0120160041</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Validation of 3D Velocity Models Using Earthquakes with Shallow Slip: Case Study of the 2014 M-w 6.0 South Napa, California, Event

Popis výsledku v původním jazyce

3D velocity models constitute a key element in strong ground motion modeling, for example, earthquake-hazard assessment. Their validation is typically based on modeling weak earthquakes with foci limited to depths greater than similar to 5 km. However, ruptures during moderate and large earthquakes can propagate to shallower depths (and eventually reach the surface). For such shallow sources, velocity models may not be validated with sufficient accuracy. In this respect, we conduct a series of tests based on the 2014 M-w 6.0 South Napa earthquake, which was characterized by a very shallow slip asperity, to assess the performance of the U.S. Geological Survey 3D San Francisco Bay area velocity model within 20-km fault distance. Our study indicates that the velocity model performs generally well with some exceptions, in which large-amplitude surface waves not present in the observed data are systematically excited. We conclude that more complex fault geometries or slightly deeper slip would not result in a better fit of the observed data. Contrarily, we demonstrate that smoothing the velocity model (i.e., reducing the strong velocity contrasts between basin fill and bedrock) effectively attenuates the spurious oscillations.

Název v anglickém jazyce

Validation of 3D Velocity Models Using Earthquakes with Shallow Slip: Case Study of the 2014 M-w 6.0 South Napa, California, Event

Popis výsledku anglicky

3D velocity models constitute a key element in strong ground motion modeling, for example, earthquake-hazard assessment. Their validation is typically based on modeling weak earthquakes with foci limited to depths greater than similar to 5 km. However, ruptures during moderate and large earthquakes can propagate to shallower depths (and eventually reach the surface). For such shallow sources, velocity models may not be validated with sufficient accuracy. In this respect, we conduct a series of tests based on the 2014 M-w 6.0 South Napa earthquake, which was characterized by a very shallow slip asperity, to assess the performance of the U.S. Geological Survey 3D San Francisco Bay area velocity model within 20-km fault distance. Our study indicates that the velocity model performs generally well with some exceptions, in which large-amplitude surface waves not present in the observed data are systematically excited. We conclude that more complex fault geometries or slightly deeper slip would not result in a better fit of the observed data. Contrarily, we demonstrate that smoothing the velocity model (i.e., reducing the strong velocity contrasts between basin fill and bedrock) effectively attenuates the spurious oscillations.

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/GA14-04372S" target="_blank" >GA14-04372S: Složitost zdrojů tektonických zemětřesení na různých časoprostorových škálách</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Bulletin of the Seismological Society of America

ISSN

0037-1106

e-ISSN

—

Svazek periodika

107

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

1019-1026

Kód UT WoS článku

000402373000037

EID výsledku v databázi Scopus

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