Seismic Site Characterization of an Urban Sedimentary Basin, Livermore Valley, California: Site Response, Basin‐Edge‐Induced Surface Waves, and 3D Simulations

Hartzell, Stephen H.; Leeds, Alena L.; Ramirez-Guzmán, L.; Allen, James P.; Schmitt, Robert G.

doi:10.1785/0120150289

Cited by 19 publications

(1 citation statement)

References 58 publications

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“…Furthermore, the 3‐D basin imaging allows us to define the infill geometry and thickness changes; this is crucial for scenario‐based seismic hazard analyses, because wave reverberation and local ground‐motion amplification are primarily controlled by sharp seismic velocity contrasts, geometric complexities in the buried bedrock topography, and lithological properties of the sedimentary infill [ Bard and Bouchon , ; Aki , ; De Luca et al ., ; Hartzell et al ., ; among many others]. In fact, increased duration, frequency‐dependent ground‐motion amplification, and spatial variability of ground motions have been observed frequently in both the near‐ and far‐field of strong to great earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Geometry and evolution of a fault‐controlled Quaternary basin by means of TDEM and single‐station ambient vibration surveys: The example of the 2009 L'Aquila earthquake area, central Italy

et al. 2017

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We applied a joint survey approach integrating time domain electromagnetic soundings and single‐station ambient vibration surveys in the Middle Aterno Valley (MAV), an intermontane basin in central Italy and the locus of the 2009 L'Aquila earthquake. By imaging the buried interface between the infilling deposits and the top of the pre‐Quaternary bedrock, we reveal the 3‐D basin geometry and gain insights into the long‐term basin evolution. We reconstruct a complex subsurface architecture, characterized by three main depocenters separated by thresholds. Basin infill thickness varies from ~200–300 m in the north to more than 450 m to the southeast. Our subsurface model indicates a strong structural control on the architecture of the basin and highlights that the MAV experienced considerable modifications in its configuration over time. The buried shape of the MAV suggests a recent and still ongoing predominant tectonic control by the NW‐SE trending Paganica‐San Demetrio Fault System (PSDFS), which crosscuts older ~ENE and NNE trending extensional faults. Furthermore, we postulate that the present‐day arrangement of the PSDFS is the result of the linkage of two previously isolated fault segments. We provide constraints on the location of the southeastern boundary of the PSDFS, defining an overall ~19 km long fault system characterized by a considerable seismogenetic potential and a maximum expected magnitude larger than M 6.5. This study emphasizes the benefit of combining two easily deployable geophysical methods for reconstructing the 3‐D geometry of a tectonically controlled basin. Our joint approach provided us with a consistent match between these two independent estimations of the basin substratum depth within 15%.

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Section: Introductionmentioning

confidence: 99%

Geometry and evolution of a fault‐controlled Quaternary basin by means of TDEM and single‐station ambient vibration surveys: The example of the 2009 L'Aquila earthquake area, central Italy

et al. 2017

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The analysis of Yunnan Dayao basin effect based on microtremor test and numerical simulation

He,

Zhang,

Liu

et al. 2024

Earthquake Engineering and Resilience

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Microtremor tests and finite element numerical simulations were used to analyze the seismic ground motion effects of the Yunnan Dayao sedimentary basin. The results of the microtremor relative to the reference point spectral ratio (HS/HR) method showed that the spectral ratio curves of each observation point in Dayao basin show multipeak characteristics, indicating that the site consists of different soil layers; the predominant frequencies of each observation point mainly are 6~9 Hz in the basin and there are lots of differences in the predominant frequencies of different observation points, which indicate that the site stiffness of each observation point is different; the differences of spectral ratios between the east–west directions (EW) and the north–south directions (NS) reveal the site's anisotropy. The amplification coefficient characteristics of each observation point in the basin obtained by numerical simulation show that the predominant frequency is 6 ~ 9 Hz; the amplification coefficients of each observation point are different; the edge effect and the focusing effect amplify the seismic ground motion in the basin; the different amplification coefficients of the two sub‐basins reflect the significant effect of the basin soil layers' differences on the seismic ground motion, the site is softer and amplification coefficients are larger; the slope degree of basin edges significantly affects the seismic ground motion near the basins edge, the amplification coefficients of the slope steeper and amplification coefficients larger. This study demonstrates that the microtremor test spectral ratio (HS/HR) method has good reliability applied to the analysis of basin effect and combining the finite element numerical simulation method is more effective in revealing the basin effect mechanism.

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Prediction and Modeling for Local Site Amplification Effect of Ground Motion: Exploring Optimized Machine Learning Approaches

Meng

Zhao

Liu

et al. 2022

Pure Appl. Geophys.

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Seismic Site Characterization of an Urban Sedimentary Basin, Livermore Valley, California: Site Response, Basin‐Edge‐Induced Surface Waves, and 3D Simulations

Cited by 19 publications

References 58 publications

Geometry and evolution of a fault‐controlled Quaternary basin by means of TDEM and single‐station ambient vibration surveys: The example of the 2009 L'Aquila earthquake area, central Italy

Geometry and evolution of a fault‐controlled Quaternary basin by means of TDEM and single‐station ambient vibration surveys: The example of the 2009 L'Aquila earthquake area, central Italy

The analysis of Yunnan Dayao basin effect based on microtremor test and numerical simulation

Prediction and Modeling for Local Site Amplification Effect of Ground Motion: Exploring Optimized Machine Learning Approaches

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