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| | Abstract | | In recent years, interest in the development of geophysical methods using unmanned aerial vehicles (UAVs, i.e., drones) has been growing rapidly. Conventional gravity/magnetic and electromagnetic (EM) exploration by helicopter and fixed-wing aircraft has been used traditionally for efficient exploration of extensive and inaccessible areas. However, the applicable targets have become limited owing to the operational difficulties of meeting the regulations, such as airframe remodeling and flight altitude control, especially in densely inhabited districts (DID). On the other hand, the traditional ground surveying method has been beset with various problems, such as a decline in the exploration efficiency for surface conditions (topography, vegetation, accessibility, and the like), high surveying costs, and others. Accordingly, there is high expectation that the new exploration method, namely, geophysical exploration using UAVs could fill the gap between the conventional airborne and ground surveying methods. Furthermore, in view of natural disasters, such as the Ontake volcanic disaster in 2014 and the Kumamoto earthquake in 2016, there is an urgent need to establish underground surveying methods that are quick, safe, and accurate in inaccessible areas. Therefore, we have been developing a new system that uses the existing portable frequency domain EM electromagnetic system with UAV/drone suspended flight. In this presentation, we introduce the progress and details of the development of this drone suspended EM surveying system, including the results of our field experiments. |
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