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| | Abstract | | Geophysical exploration can measure cumulative information from the underground to the surface layer, and rock property measurement is very effective in interpreting the results of geophysical exploration. However, rock property information has not been examined intensively in parallel with geophysical exploration so far. In this study, we measured rock properties of volcanic rocks in the Musadake area of Hokkaido as a case study. In this area, the Japan Oil, Gas and Metals National Corporation (JOGMEC) conducted a high-resolution aeromagnetic survey in 2017. In addition to the exploration, JOGMEC conducted a surface geological survey on site and measured the general direction of magnetization of outcrops as well as magnetic susceptibility. However, the detailed magnetic properties of the rocks were unknown. Therefore, the collected rocks were reshaped and their physical properties were measured in the laboratory, and the results were compared with the observed aeromagnetic anomalies. As a result, the initial magnetizations of all the rock samples after AF demagnetization showed a reverse direction, suggesting that the remarkable low magnetic anomalies near the outcrops can be attributed to the distribution of reversely magnetized rocks. |
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