Long offset acquisition

A geophysical survey system, comprising:

• one and only one source vessel;
• a signal source coupled to the source vessel;
• a plurality of first streamers coupled to the source vessel, each of the first streamers being no more than 12 km in length;
• a long-offset streamer comprising a plurality of segments;
• and
• a plurality of long-offset streamer vessels, wherein each of the plurality of segments is coupled to a respective one of the plurality of streamer vessels.

A method of geophysical surveying, comprising:

• operating one and only one source vessel;
• towing a signal source with the source vessel;
• towing a standard-offset survey spread with the source vessel, wherein each streamer of the standard-offset survey spread is no more than 12 km in length;
• towing a long-offset streamer with a long-offset streamer vessel;
• acquiring a first set of data with the signal source and receivers of the standard-offset survey spread;
• and
• while acquiring the first set of data, acquiring a second set of data with the signal source and receivers of the long-offset streamer, wherein:
• the long-offset streamer comprises an aft-most receiver, and
• while acquiring the second set of data, an offset between the signal source and the aft-most receiver is at least 20 km.