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Focused blind deconvolution

We introduce a novel multichannel blind deconvolution (BD) method that extracts sparse and front-loaded impulse responses from the channel outputs, i.e., their convolutions with a single arbitrary source. Unlike most prior work on BD, a crucial …

Redshift of earthquakes via focused blind deconvolution of teleseisms

We present a robust factorization of the teleseismic waveforms resulting from an earthquake source into signals that originate from the source and signals that characterize the path effects. The extracted source signals represent the earthquake …

A shear-wave seismic system using full-waveform inversion to look ahead of a tunnel-boring machine

In the near surface with unconsolidated soils, shear-wave properties can often be characterised better and with a higher resolution than compressional-wave properties. To enable imaging ahead of a tunnel-boring machine, we developed a seismic …

Full waveform inversion with an auxiliary bump functional

Least-squares inversion of seismic arrivals can provide remarkably detailed models of the Earth's subsurface. However, cycle skipping associated with these oscillatory arrivals is the main cause for local minima in the least-squares objective …

Enhancing core-diffracted arrivals by supervirtual interferometry

The theory of supervirtual interferometry is modified so that free-surface related multiple refractions can be used to enhance the signal-to-noise ratio (SNR) of primary refraction events by a factor proportional to Ns, where Ns is the number of …

Increasing the number and signal-to-noise ratio of OBS traces with supervirtual refraction interferometry and free-surface multiples

The theory of supervirtual interferometry is modified so that free-surface related multiple refractions can be used to enhance the signal-to-noise ratio (SNR) of primary refraction events by a factor proportional to sqrt(Ns), where Ns is the number …

Study and mapping of ground water prospect using remote sensing, GIS and geoelectrical resistivity techniques—a case study of Dhanbad district, Jharkhand, India

Water is an important natural resource, which is available both on surface as well as in recharge zone of weathered layer and in various other suitable water reservoir formations/structures below the surface. As the availability of surface water is …

Theory of supervirtual refraction interferometry

Inverting for the subsurface velocity distribution by refraction traveltime tomography is a well‐accepted imaging method by both the exploration and earthquake seismology communities. A significant drawback, however, is that the recorded traces …

Enhanced refractor imaging by supervirtual interferometry

Refraction surveys are a well-established method of imaging subsurface velocities, both in terms of the deep crustal structure at global scales and in the shallow near surface. These surveys generally involve deploying an array of receivers on the …