Using a moving source to generate Rayleigh waves

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Stephenson, W.R.; O'Reilly, C.W. 2002 Using a moving source to generate Rayleigh waves . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2002/15 18 p.

Abstract: A sequence of nine explosions at 10m spacings along a straight line was used to simulate a wave source moving at 400m/s along the surface of the Hutt Valley, near the Hutt estuary. Each successive explosion occurred 25 milliseconds after the previous one; each explosion used half a stick of powergel, and each explosive charge was buried 1m underground. The radial component of the recorded motion had its spectrum enhanced for frequencies of 1.21Hz and 4.82Hz. These frequencies are possibly the fundamental mode frequency of a Rayleigh wave travelling at 400m/s, and the frequency of an unidentified wave travelling at 338m/s. If the lower frequency identified is the fundamental mode frequency of a Rayleigh wave travelling at 400 m/s, the moving source concept could be used to obtain dispersion characteristics of soft sites, and by inversion, to deduce the shear wave profiles of such sites. Enhancements to the concept are suggested. These would make the method easier to implement and the results clearer to interpret. (auth)