Ground‐Motion Attenuation in the Sacramento–San Joaquin Delta, California, from 14 Bay Area Earthquakes, including the 2014 M 6.0 South Napa Earthquake

Erdem, Jemile; Boatwright, J.; Fletcher, J. B.

doi:10.1785/0120180182

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…Examination of the 2014 South Napa earthquake comparisons clearly shows as observed by Baltay and Boatwright (2015) and Erdem et al (2019) that the data are significantly lower than the NGA-West2 GMMs at PGA (Figures 8 and 9). However, we looked at all raypaths (not just those through the Delta) and found that even for stations where the raypaths do not cross the Delta, the ground motions are lower in the 2014 earthquake.…”

Section: Evaluation Of Gmmsmentioning

confidence: 65%

“…It is worth noting that we are comparing the recorded data from 14 earthquakes with four of the NGA-West2 GMMs, and not just a single model as did Erdem et al (2019). Our observations for the 2014 mainshock could be explained by a lower-than-average stress drop which would affect ground motions at all azimuths.…”

Section: Evaluation Of Gmmsmentioning

confidence: 85%

“…Erdem et al (2019) evaluated 14 additional Bay area earthquakes ( M > 4) to assess whether the same attenuation effects observed in the 2014 South Napa earthquake are also present in the Delta and surrounding region. They restricted the dataset to PGA and peak ground velocity (PGV) and for stations where the raypaths crossed through the Delta.…”

Section: Evaluation Of Gmmsmentioning

confidence: 99%

“…In this study, we compared the strong motion data of 14 earthquakes downloaded from Center for Earthquake Strong Motion Data (CESMD) and the Pacific Earthquake Engineering Research (PEER) Center that have occurred within 100 km of the center of the Delta since 1980 and the NGA-West flatfile (Table 2; Figure 7). Only seven of the earthquakes in our dataset were evaluated by Erdem et al (2019) because they restricted their dataset to only include earthquakes whose raypaths traversed the Delta. They also were able to obtain more station recordings in the Delta than in our study.…”

Section: Evaluation Of Gmmsmentioning

confidence: 99%

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Seismic hazard analyses of the Metropolitan Water District Emergency Freshwater Pathway, California

et al. 2021

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The Sacramento-San Joaquin Delta in central California is particularly susceptible to damage in a large earthquake due to the vulnerability of the levees that protect cities, farms, and infrastructure. The Delta is located adjacent to the seismically active San Andreas fault system and is also subject to strong ground shaking from numerous other seismic sources in central California, including faults within the Delta. We performed a probabilistic seismic hazard analysis (PSHA) to provide seismic design ground motions for the Metropolitan Water District (MWD) Emergency Freshwater Pathway. We have evaluated the appropriateness of the Next Generation of Attenuation (NGA)-West2 ground motion models for use in our analyses of the Delta, evaluated shear-wave velocity ( VS) data in the vicinity of the Pathway, and performed site response analyses. The latter was performed to compute the probabilistic hazard at the top of the peat at five sites along the Pathway. The sixth site was located outside the Delta and on firm soil. The probabilistic hazard for the six sites and for a range of return periods of engineering relevance were computed in the PSHA. For a return period of 2500 years, the peak horizontal ground acceleration (PGA) values on peat ranged from 0.40 g to 0.53 g. The seismic sources that control the hazard at these sites vary as a function of return period and spectral frequency, but in general, the closer the sites are to faults within the San Andreas fault system, the higher the hazard.

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Section: Evaluation Of Gmmsmentioning

confidence: 65%

Section: Evaluation Of Gmmsmentioning

confidence: 85%

Section: Evaluation Of Gmmsmentioning

confidence: 99%

Section: Evaluation Of Gmmsmentioning

confidence: 99%

See 2 more Smart Citations

Seismic hazard analyses of the Metropolitan Water District Emergency Freshwater Pathway, California

et al. 2021

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Estimation of Source and Spectral Decay Parameters for Local Earthquakes in Siang Region of Arunachal Himalaya and Its Implication to the Tectonics and Crustal Heterogeneity

Rai,

Mittal,

Singh

2024

Pure Appl. Geophys.

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Estimates of κ0 and Effects on Ground Motions in the San Francisco Bay Area

Nye

Sahakian

King

et al. 2022

Bulletin of the Seismological Society of America

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Ground-motion studies are a key component of seismic hazard analyses and often rely on information of the source, path, and site. Extensive research has been done on each of these parameters; however, site-specific studies are of particular interest to seismic hazard studies, especially in the field of earthquake engineering, as near-site conditions can have a significant impact on the resulting ground motion at a site. There has been much focus on the constraint of site parameters and their application to seismic hazard studies, especially in the development of ground-motion models (GMMs). Kappa is an observational parameter describing the high-frequency attenuation of spectra, and its site contribution (κ0) has shown to be a good predictor of high-frequency ground motions; however, measurements are often limited. In this study, we develop a κ0 dataset for the San Francisco Bay area (SFBA) by estimating κ0 for 228 stations, and we produce a continuous regional map of κ0. We find κ0 to range between 0.003 and 0.072 s, with larger values concentrating on the east, north, and south sides of the bay, and lower values concentrating on the west side. We also evaluate the robustness of κ0 as a site parameter and find it to correlate with peak ground acceleration. These estimates of κ0 can add predictive power to GMMs, thus increasing the accuracy of predicted ground motion and improving the robustness of ground-motion studies in the SFBA.

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Ground‐Motion Attenuation in the Sacramento–San Joaquin Delta, California, from 14 Bay Area Earthquakes, including the 2014 M 6.0 South Napa Earthquake

Cited by 6 publications

References 14 publications

Seismic hazard analyses of the Metropolitan Water District Emergency Freshwater Pathway, California

Seismic hazard analyses of the Metropolitan Water District Emergency Freshwater Pathway, California

Estimation of Source and Spectral Decay Parameters for Local Earthquakes in Siang Region of Arunachal Himalaya and Its Implication to the Tectonics and Crustal Heterogeneity

Estimates of κ0 and Effects on Ground Motions in the San Francisco Bay Area

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