Abstract
Much of the ocean floor is covered with layers of soft sediment that cannot withstand large shearing forces without tearing. As a consequence, shear-wave slowness is an order of magnitude larger in ocean sediments than in crustal rock. The soft sea floor is a low velocity zone that focuses seismic energy, causing interface waves (or Stoneley waves) to travel along the ocean bottom in the same fashion that Rayleigh waves travel along the surface of the earth. In this paper we present Stoneley wave data from sea-floor sources recorded on ocean bottom seismometers (OBS’s) at deep water sites off the California coast. To interpret the data, we generate synthetic seismograms based on thinly layered, low shear velocity models.
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