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9C seismic data acquisition for near-surface applications: recording, waveform reciprocity and 4C rotationNormal access

Authors: C. Schmelzbach, D. Sollberger, S.A. Greenhalgh, H. Horstmeyer, H. Maurer and J.O.A. Robertsson
Event name: 78th EAGE Conference and Exhibition 2016 - Workshops
Session: WS04-Developments and Applications in Near-surface Seismology
Publication date: 31 May 2016
DOI: 10.3997/2214-4609.201601639
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.31Mb )
Price: € 20

Multicomponent seismic data allow the study of shear (S) waves, which is of great interest to characterize, for example, anisotropy. We present a 9C seismic data analysis workflow that involves the acquisition of multicomponent seismic data using a sledgehammer striking a prismatic wedge as vectorial seismic source and 3C receivers. Inclined impacts on the two opposing sides of the wedge are rotated into a vertically- and horizontally-directed source. Advantages of this source are the simultaneous recording of horizontally- and vertically-directed sources with uniform coupling. Re-orienting the wedge allows acquiring data with orthogonally-oriented horizontally-directed sources. A 4C rotation of the two source and two receiver horizontal components allows then determining, for example, the apparent arrival direction of two orthogonally-polarized direct S-waves, which may differ from the source-receiver direction. While applied here to find the arrival direction of the direct S-wave, our workflow can also be used to study anisotropy through analysis of S-wave splitting.

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