Method for synchronizing seismic data recorded by two or more separate recording systems

A method for seismic surveying, comprising:

• deploying a first plurality of seismic sensors in a selected pattern above a subsurface volume to be evaluated;
• deploying a second plurality of seismic sensors in a wellbore drilled proximate the volume;
• recording seismic signals generated by the first plurality of sensors in a first recording unit;
• recording seismic signals generated by the second plurality of sensors in a second recording unit;
• recording signals generated by a reference seismic sensor disposed proximate the volume in both the first and the second recording units;
• cross-correlating the reference sensor signals recorded by each of the first recording unit and the second recording unit;
• determining peaks in a power spectrum of the cross-correlated signals;
• notch filtering the reference signals recorded by each of the first and second recording units using at least one notch frequency selected from the power spectrum;
• cross-correlating the notch filtered reference signals;
• and
• determining a time offset between recordings made by the first recording unit and the second recording unit from the cross-correlated, notch filtered signals.