Electromagnetic receiver assembly for marine electromagnetic surveying

A marine electromagnetic survey method, comprising:

• deploying a first electromagnetic receiver assembly at or near a bottom of a body of water, wherein the first electromagnetic receiver assembly comprises:
• a first elongated housing, wherein the first elongated housing defines an interior chamber;
• receiver electrodes, wherein the receiver electrodes are mounted at separate points along the first elongated housing;
• sensor electronics disposed in the interior chamber of the first elongated housing and electrically coupled to the receiver electrodes;
• a second elongated housing rotatably coupled to the first elongated housing, wherein the second elongated housing defines an interior chamber,
• additional receiver electrodes configured to be in contact with water when in operation, wherein the additional receiver electrodes are mounted at separate points along the second elongated housing;
• transmitting an energy field into the body of water;
• and
• sensing a parameter related to the energy field with the receiver electrodes.

An electromagnetic survey system, comprising:

• an electromagnetic source configured to emit an energy field into a body of water;
• an electromagnetic receiver assembly configured for deployment on or near a bottom of the body of water, wherein the electromagnetic receiver assembly comprises:
• a first elongated housing, wherein the first elongated housing defines an interior chamber;
• receiver electrodes configured to sense a parameter related to the energy field, wherein the receiver electrodes are mounted at separate points along the first elongated housing;
• sensor electronics disposed in the interior chamber of the first elongated housing and electrically coupled to the receiver electrodes;
• a second elongated housing rotatably coupled to the first elongated housing, wherein the second elongated housing defines an interior chamber,
• additional receiver electrodes configured to be in contact with water when in operation, wherein the additional receiver electrodes are mounted at separate points along the second elongated housing.