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Volume 19 Number 2
  • ISSN: 1569-4445
  • E-ISSN: 1873-0604

Abstract

ABSTRACT

Seismic surveys were performed using a novel application of combined active and passive surface wave methods to evaluate the integrity of levees protecting islands in the Sacramento–San Joaquin Delta, California, USA, from flooding. Delta islands have been undergoing rapid subsidence during the past century due to farming practices that have led to the loss of a surficial peat layer. A large earthquake on any one of several active faults in the region could cause multiple levee failures and extensive flooding in the Delta. Surface wave surveys were carried out along the crest of levees using the active method (2D multichannel analysis of surface waves) and along the base of levees using the passive method (microtremor array method). This allowed 2D seismic S‐wave velocity () profiles to be prepared for each site by combining shallow data from the active survey along the crown of the levee with deeper data from a passive survey along the toe of the levee. These profiles reveal a low‐velocity peat layer beneath the levee body that was confirmed by geotechnical borehole logs. Lateral variability of the levee was evaluated using average velocity to the base of the levee versus along‐levee distance.

© 2021 European Association of Geoscientists & Engineers © 2021 European Association of Geoscientists & Engineers
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/content/journals/10.1002/nsg.12144
2021-04-16
2024-04-25

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http://instance.metastore.ingenta.com/content/journals/10.1002/nsg.12144
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Active and passive seismic surface wave methods for levee assessment in the Sacramento–San Joaquin Delta, California, USA
Near Surface Geophysics 19, 141 (2021); https://doi.org/10.1002/nsg.12144
/content/journals/10.1002/nsg.12144
/content/journals/10.1002/nsg.12144
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  • Article Type: Research Article
Keyword(s): Geotechnical; MASW; Seismic; Surface wave; S‐wave; Velocity

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