Modeling Velocity Recordings of the Mw 6.0 South Napa, California, Earthquake: Unilateral Event with Weak High-Frequency Directivity

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10331165" target="_blank" >RIV/00216208:11320/16:10331165 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1785/0220150042" target="_blank" >http://dx.doi.org/10.1785/0220150042</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1785/0220150042" target="_blank" >10.1785/0220150042</a>

Result language

angličtina

Original language name

Modeling Velocity Recordings of the Mw 6.0 South Napa, California, Earthquake: Unilateral Event with Weak High-Frequency Directivity

Original language description

On 24 August 2014, an Mw 6.0 earthquake struck the Napa area in the north San Francisco Bay region, causing one fatality and damaging many older buildings in the Napa area. First, I employ low-frequency data (0.05-0.5 Hz) from 10 near-fault strong-motion stations to perform slip inversion, revealing (in agreement with other studies) rupture propagating up-dip and unilaterally along the fault with a dominant shallow asperity. Then I generate broadband synthetics (0.05-5 Hz) using an advanced Ruiz integral kinematic (RIK) source model (Ruiz et al., 2011) and a 1D velocity model. The RIK model is composed of randomly distributed overlapping subsources with a fractal number-size distribution. The particular distribution of the RIK subsources is constrained by the low-resolution slip model from the inversion. Besides providing stable omegasquared spectral decay at high frequencies, the RIK model is able to reproduce the frequency-dependent directivity effect with adjustable strength. Comparison of the synthetic velocity waveforms with the observed data shows that the smallest modeling bias and variance is achieved by a rupture model with complex rupture propagation and thus weak high-frequency directivity. I link my findings with other studies, including analog experiments by Day et al. (2008), suggesting that this feature is rather common to earthquake sources.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DC - Seismology, volcanology and Earth structure

OECD FORD branch

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Project

<a href="/en/project/GA14-04372S" target="_blank" >GA14-04372S: Multiscale spatial-temporal complexity of tectonic earthquake sources</a><br>

Continuities

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

Publication year

2016

Confidentiality

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

Name of the periodical

Seismological Research Letters

ISSN

0895-0695

e-ISSN

—

Volume of the periodical

87

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

2-14

UT code for WoS article

000375045700001

EID of the result in the Scopus database

2-s2.0-84954232518