Ocean waves as a passive MASW source

摘要: Abstract Ocean waves have long been considered to be a source of seismic surface-wave energy for subsurface exploration. We test the utility ocean-source recording, sensitivity array orientation with respect shoreline direction, and equivalence passive- active-source data acquired in near-shore environment. The Kohala peninsula northwestern Hawaiʻi (Big Island), its exposure strong trade winds prominent rock soil outcrops along sea cliffs, provides an ideal natural laboratory study ocean noise as passive source. results show that passive-source recorded from over headland produce coherent dispersion relationships (phase velocity function frequency) can modeled shear-wave shallow subsurface, especially when combined data. also demonstrate dependence on quality spectra—an perpendicular produces more complete frequency range higher coherency, relative oriented parallel shoreline. Previous geophysical investigations site, constrained by geologic outcrop adjacent cliff, confirm velocity-depth modeling. used modeling upper 10–50 m relatively short array, but improved combining active sources orienting direction ocean-wave propagation.