Recovering Old Geophysical Documents for Deep Aquifer Research

Most of the geophysical field data do not depend on the objectives and date of their measurement, and can be used again with another purpose, whenever its quality and the acquisition parameters allow it. The Geological Survey of Spain (IGME) is involved in the development a new database gathering most of the geophysical surveys carried out within the institution in the last thirty-forty years and is now incorporating data from other sources as the hydrocarbons exploration. For ancient surveys the most normal situation is that original field data no longer exists, and only paper copy documents are available. Two examples of recovering such information are given. They belong to multidisciplinary projects for the development of a methodology for hydrogeological research. In both cases the reprocessing and/or reinterpretation of old documents has provided fundamental information and served as an excellent guide for optimizing the design of new geophysical surveys.