Ground motions on rocky, cliffed, and sandy shorelines generated by ocean waves

DOI Web Site Web Site 被引用文献1件
  • Adam P. Young
    Integrative Oceanography Division Scripps Institution of Oceanography University of California San Diego La Jolla California USA
  • Robert T. Guza
    Integrative Oceanography Division Scripps Institution of Oceanography University of California San Diego La Jolla California USA
  • Mark E. Dickson
    School of Environment University of Auckland Auckland New Zealand
  • William C. O'Reilly
    Integrative Oceanography Division Scripps Institution of Oceanography University of California San Diego La Jolla California USA
  • Reinhard E. Flick
    Integrative Oceanography Division Scripps Institution of Oceanography University of California San Diego La Jolla California USA

書誌事項

公開日
2013-12
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2013jc008883
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We compare ground motions observed within about 100 m of the waterline on eight sites located on shorelines with different morphologies (rock slope, cliff, and sand beaches). At all sites, local ocean waves generated ground motions in the frequency band 0.01–40 Hz. Between about 0.01 and 0.1 Hz, foreshore loading and gravitational attraction from ocean swell and infragravity waves drive coherent, in‐phase ground flexing motions mostly oriented cross‐shore that decay inland. At higher frequencies between 0.5 and 40 Hz, breaking ocean waves and wave‐rock impacts cause ground shaking. Overall, seismic spectral shapes were generally consistent across shoreline sites and usually within a few orders of magnitude despite the diverse range of settings. However, specific site response varied and was influenced by a combination of tide level, incident wave energy, site morphology, ground composition, and signal decay. Flexing and shaking increased with incident wave energy and was often tidally modulated, consistent with a local generation source. Flexing magnitudes were usually larger than shaking, and flexing displacements of several mm were observed during relatively large incident wave conditions (Hs 4–5 m). Comparison with traffic noise and earthquakes illustrate the relative significance of local ocean‐generated signals in coastal seismic data. Seismic observations are not a simple proxy for wave‐cliff interaction.</jats:p>

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