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all geography including DSDP/ODP Sites and Legs
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Processing of seismic diffractions from carbonate nodules in clay formations
Seismic-while-drilling by drill-bit source and large-aperture ocean-bottom array
Seismic-while-drilling applications from the first DrillCAM trial with wireless geophones and instrumented top drive
Seismic-while-drilling drill-bit source by ground force: Concept and application
Dual wavefields from distributed acoustic sensing measurements
Multidimensional deconvolution and processing of seismic-interferometry Arctic data
Seismic interferometry application to improve seismic reflection signals affected by ice-plate flexural noise
Synthesis and composition of virtual-reflector (VR) signals
Abstract We discuss the use of autocorrelogram interferometry by using noise from the tunnel-boring machine (TBM). The TBM provides seismic signals/waves while drilling in a tunnel (TSWD). The tunnel geometry, unlike a reverse vertical seismic profile (RVSP) using a drill bit, makes it possible to record the waves reflected from the region between the tunnel face and the projected tunnel exit and those transmitted ahead of the tunnel face. We processed the waves recorded at back positions with respect to the TBM in a manner similar to a RVSP data set obtained by conventional reference-correlation techniques. We processed the waves transmitted ahead of the TBM using autocorrelogram interferometry techniques. Using these wavefields offers advantages over conventional borehole drill-bit vertical seismic profiles (VSPs). The most important advantage is getting reflections from the transmitted (front) wavefield by utilizing Kunetz’s equation and reversed-time traces. The approach also improves the analysis of the transmitted amplitudes. Finally, we improved the deconvolution of the reflected (back) waves by using the transmitted wavefields measured for interferometry purposes. In particular, by using both front (transmitted) and back (reflected) waves, it is possible to deconvolve the signature of the source extended spatially along the tunnel axis. We use a 1D model in which the interfaces are assumed subvertical. We present a case history in which TSWD data were acquired in a tunnel measuring 950 m long. We compare results from the transmitted reversed-time and back-reflected waves (5 -waves) with those obtained by amplitude analysis and estimation of reflection coefficients. Each approach matches the interpretation of the fractures encountered in the tunnel.