Measuring and modifying directionality of seismic interferometry data

A method of modifying a directionality function of a virtual source used in seismic interferometry, said method comprising:

• executing computer readable program code with a processor to implement the steps of:
• reading data stored on a data storage device, the data comprising recorded seismic wave data incident on each individual seismic receiver of an array of seismic receivers, wherein each receiver of the array of seismic receivers has an associated location within the array;
• performing a domain transform on the recorded seismic wave data over the array locations of the receivers to separate the recorded seismic wave data into different transform components, wherein each transform component corresponds to a type of wave that has some directionality;
• measuring a signal strength measurement for each transform component;
• and
• determining multiplication factors to convert the measured signal strength for each transform component into a desired strength for each transform component.

A system operable to modify a directionality function of a virtual source used in seismic interferometry, said system comprising:

• at least one data storage device, the data storage device storing data comprising recorded seismic wave data incident on each individual seismic receiver of an array of seismic receivers, wherein each receiver of the array of seismic receivers has an associated location within the array;
• and
• a processor enabled to:
• read the recorded seismic wave data stored on the at least one data storage device;
• perform a domain transform on the recorded seismic wave data over the array locations of the receivers to separate the recorded seismic wave data into different transform components, wherein each transform component corresponds to a type of wave that has some directionality;
• measure a signal strength measurement for each transform component;
• and
• determine multiplication factors to convert the measured signal strength for each transform component into a desired strength for each transform component.