Giuseppe Bolondi AGIP SpA Milan A knowledge of the structure of the earth's deep crust, down to 3040 km is at the basis of our understanding of the geological processes that have given rise to the formation of mountain chains and sedimentary basins and to such phenomena as volcanoes and earthquakes. Present geological and geophysical knowledge of the upper portion of the earth's crust has in recent years received a decisive overall impetus mainly as a result of work carried out in the field of oil and gas exploration. Such activities have in fact provided an enormous quantity of data on land and offshore as the result ...

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