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SH-wave generator consisting of a vertical force and a pit in its vicinityNormal access

Authors: C. Kitsunezaki, T. Yokio, K. Okuzumi and N. Goto
Event name: 54th EAEG Meeting
Session: Borehole & VSP I
Publication date: 01 June 1992
DOI: 10.3997/2214-4609.201410361
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 143.3Kb )
Price: € 20

Contrary to conventional idea, predominant SH-waves are sometimes radiated from vertical impacts on the ground surface. Systematic field experiments were carried out to investigate the mechanism. The experiments revealed that the SH-waves are excited by waves incident on the boundary of a lower rigidity portion in the near-surface ground close to the impact positions. Accordingly inhomogeneities in the ground are considered to be the main cause of such SH-wave radiation that we encounter incidentally in usual seismic works using vertical forces as their sources.

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