Even if in the last decades the use of remote sensing technologies (from satellite, aerial and ground) for archaeology is stepping in its golden age, in Southern America, the geophysics for preventive archaeology is more recent and less used compared to Europe, Central America, and Middle East. . In this paper, we provide a brief overview, and show the preliminary results obtained from the investigations conducted in Chachabamba (Peru). The archaeological area is located on a strategic terrace overlooking three Inca roads, which served the most important ceremonial centres (including Machu Picchu) of the Urubamba Valley also known as the Sacred Valley. In particular, Chachabamba investigations were conducted with two principal aims : 1) to give new impetus to archaeological research with targeted investigations aimed at improving and completing the site's knowledge framework; 2) to experiment and validate an archeogeophysical approach to be re-applied in other sites of the Urubamba valley, including Machu Picchu, having similar characteristics as those found in Chachabamba. Response to Reviewers:We thank the Guest Editor for the valuable suggestions and corrections which have been addressed contributing to the improvement of the paper

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Se discuten los eventos e implicancias de las Expediciones Peruanas de Yale (EPY) en base al procesamientode la información de las publicaciones, documentos, diarios de campo, registros gráficos e informes de laslabores efectuadas durante 1911 y 1912 en la Llaqta de Machupicchu. Asimismo, se presenta el primer plano de las excavaciones ejecutadas durante 1912, el mismo que ha sido elaborado en función al diario de campo del ingeniero Ellwood Erdis.

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