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Seismological Research Letters

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Institución detectada Período Navegá Descargá Solicitá
No detectada desde ene. 1987 / hasta dic. 2023 GeoScienceWorld

Información

Tipo de recurso:

revistas

ISSN impreso

0895-0695

ISSN electrónico

1938-2057

País de edición

Estados Unidos

Fecha de publicación

Tabla de contenidos

Near-Field Ground Motions from the July 2019 Ridgecrest, California, Earthquake Sequence

Susan E. Hough; Eric Thompson; Grace A. Parker; Robert W. Graves; Kenneth W. Hudnut; Jason Patton; Timothy Dawson; Tyler Ladinsky; Michael Oskin; Krittanon Sirorattanakul; Kelly Blake; Annemarie Baltay; Elizabeth Cochran

<jats:title>Abstract</jats:title> <jats:p>The 2019 Ridgecrest, California, earthquake sequence, including an Mw 6.4 event on 4 July and an Mw 7.1 approximately 34 hr later, was recorded by 15 instruments within 55 km nearest-fault distance. To characterize and explore near-field ground motions from the Mw 6.4 foreshock and Mw 7.1 mainshock, we augment these records with available macroseismic information, including conventional intensities and displaced rocks. We conclude that near-field shaking intensities were generally below modified Mercalli intensity 9, with concentrations of locally high values toward the northern and southern termini of the mainshock rupture. We further show that, relative to near-field ground motions at hard-rock sites, instrumental ground motions at alluvial near-field sites for both the Mw 6.4 foreshock and Mw 7.1 mainshock were depleted in energy at frequencies higher than 2–3 Hz, as expected from ground-motion models. Both the macroseismic and instrumental observations suggest that sediments in the Indian Wells Valley experienced a pervasively nonlinear response, which helps explain why shaking intensities and damage in the closest population center, Ridgecrest, were relatively modest given its proximity to the earthquakes.</jats:p>

Palabras clave: Geophysics.

Pp. 1542-1555