Abstract: In a method for deghosting seismic data acquired by a marine seismic source and receiver assembly effects of seismic reflections by the water surface, known as ghost signals, are removed by a deghosting algorithm, which transforms input seismic data with the surface ghost reflections into source- and receiver-deghosted seismic data using a sparse-inversion technique both for hydrophone and/or geophone recordings, which technique includes equation (26), thereby considerably improving usuable bandwidth and giving rise to a significant imaging uplift.

Abstract: In a method for deghosting seismic data acquired by a marine seismic source and receiver assembly effects of seismic reflections by the water surface, known as ghost signals, are removed by a deghosting algorithm, which transforms input seismic data with the surface ghost reflections into source- and receiver-deghosted seismic data using a sparse-inversion technique both for hydrophone and/or geophone recordings, which technique includes equation (26), thereby considerably improving usuable bandwidth and giving rise to a significant imaging uplift.

Abstract: Techniques for sensor data time alignment are described. According to one or more embodiments, sensor data from different sensor systems is time-aligned to a reference time base. For instance, reference time values may be propagated to sensor systems to enable the sensor systems to mark sensor data based on the reference time values. Sensor data from a sensor system may be time-aligned by applying an alignment policy to the sensor data. An alignment policy, for example, accounts for a difference between a time base of a sensor system and a reference time base. Thus, sensor data from different sensor systems may be aligned to common time values in a variety of different ways.