An Attempt of Geomagnetic Field Measurement with a Radio-Controlled Blimp in the Vicinity of the Tanna Fault.

Abstract

A blimp-borne survey system was developed to measure the geomagnetic field at low altitude, with a portable proton-precession magnetometer and a portable global positioning system (GPS) installed in a small radio-controlled blimp. The total weight of the instruments was well below the blimp payload of 25kg. The result of the blimp-borne survey which we carried out in the Tanna Basin was compared with that of the ground survey in the same area. It was then confirmed that a magnetic anomaly map could successfully be derived from the blimp survey.

N-body Code with Adaptive Mesh Refinement

“…We adopted a time stepping scheme called the hierarchical time steps (e.g. Makino 1991). The time step of each particle is not the same but restricted to 2 −i times of the longest time steps.…”

Local Magnetic Anomalies Associated with Active Faults in Beppu Bay, Southwest Japan.

“…Beppu Bay is located in the graben and many faults have been developed; most of them still seem to be active. The distribution of active faults, as found from acoustic sounding (Nakata and Shimazaki, 1993), in the western portion of Beppu Bay is shown in Fig. 2 together with magnetic survey tracks.…”

“…Brabb and Hanna, 1981;Honkura et al, 1985;I §ikara et al, 1985;Ohshiman et al, 1987;Honkura and I §ikara, 1991;Makino et al, 1991;Okubo et al, 1991;Tuncer et al, 1991a, b). In particular, the examples obtained in the North Anatolian Fault Zone Honkura and I §ikara, 1991) are the most representative ones and the observed anomalies could be interpreted in terms of highly magnetized dike-like bodies lying along the active faults (I §ikara et al, 1985).…”

“…501 conditions. One effective way to avoid such difficulty is to make an aeromagnetic survey at low altitude; helicopter-borne surveys and even blimp-borne surveys are now possible (Makino et al, 1991).…”