The invention relates to a geophysical measurement device for the exploration of natural resources of the floor in an aquatic domain, comprising: a frame designed to rest in a stable manner on the said floor of the said aquatic environment; at least one buoyancy caisson resting on the said frame; and means forming measurement instruments including: at least one sensor making it possible to measure locally at least one of the components of the magnetic field; means forming an analogue and/or digital data acquisition and processing device; and means forming a source of energy supply of the said sensor and of the said means forming the data acquisition and processing device. According to the invention, the said at least one sensor is contained inside the said buoyancy caisson.
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