Abstract: A method of exploring for hydrocarbons in a region, including the steps of obtaining seismic data for the region corresponding to two or more different times and analyzing the seismic data corresponding to the two or more different times to determine whether there are any changes in the seismic data.

Abstract: A method of at least partially deghosting recorded seismic s-waves, wherein recorded seismic data is provided, wherein the recorded seismic data has been recorded at a receiver located beneath the Earth's surface, and wherein the recorded seismic data includes s-wave data. The method may include the steps of finding a model of the Earth's crust for use in deghosting the recorded seismic data using the s-wave data, wherein the model includes at least one region and wherein the model includes the Earth's surface and the location of the receiver, using the model to find a deghosting operator that, when applied to the s-wave data, at least partially deghosts the s-wave data, and applying the deghosting operator to the s-wave data to at least partially deghost the s-wave data.

Abstract: A method of at least partially deghosting recorded seismic s-waves, wherein recorded seismic data is provided, wherein said recorded seismic data has been recorded at a receiver (15) located beneath the Earth's surface (13), and wherein said recorded seismic data comprises s-wave data, the method comprising: finding (3) a model (10) of the Earth's crust for use in deghosting the recorded seismic data using the s-wave data, wherein the model comprises at least one region (11, 12, 16) and wherein the model comprises the Earth's surface (13) and the location of the receiver (15); using (4) said model (10) to find a deghosting operator that, when applied to the s-wave data, at least partially deghosts the s-wave data; and applying (5) the deghosting operator to the s-wave data to at least partially deghost the s-wave data.