Figure 1.15: Seismic waves generated by natural or man-made sources are ubiquitous in the Earth’s crust. Recording this ‘voice’ of nature by employing arrays of hydrophones in the sea or geophones on the ground gives information about the geology. Seismic listening holds potential for oil and gas prospecting. The million dollar question is: do oil and gas reservoirs produce a unique signature or a kind of ‘music’ that can be measured to provide direct information about their locations and characteristics? Illustration by Inge Grødum, made for Geco around 1980.
