JpGU-AGU Joint Meeting 2020

Presentation information

[E] Poster

S (Solid Earth Sciences ) » S-EM Earth's Electromagnetism

[S-EM19] Earth and planetary magnetism: Observations, modeling, and implications on dynamics and evolution

convener:Hirokuni Oda(Institute of Geology and Geoinformation, Geological Survey of Japan, AIST), Futoshi Takahashi(Faculty of Sciences, Kyushu University), Courtney Jean Sprain(University of Florida), Yoichi Usui(Japan Agency for Marine-Earth Science and Technology)

[SEM19-P01] Magnetic survey for buried old kilns with paleomagnetic and rock magnetic interpretation

*Tadahiro Hatakeyama1,2, Yu Kitahara3, Nobutatsu Mochizuki4, Yorinao Shitaoka5, Kenji Kanegae6, Hirotsugu Matsusaki7, Naoko Nakamura8 (1.Information Processing Center, Okayama University of Science, 2.Graduate School of Biosphere-Geosphere Science, Okayama University of Science, 3.Graduate School of Social and Cultural Studies, Kyushu University, 4.Faculty of Advanced Science and Technology, Kumamoto University, 5.Faculty of Geo-Environmental Science, Rissho University, 6.Archaeological Museum, The International University of Kagoshima, 7.Education Board, Ibusuki City, 8.Research Center for Archaeology, Kagoshima University)

Keywords:Magnetic survey, Paleomagnetism

Magnetic surveys at an old kiln site cluster in Kagoshima Pref., southwest Japan were conducted, and five magnetic anomalies were detected on the hill slopes, based on a Cretaceous sedimentary rocks. A magnetic anomaly map at one of the sites was drawn and an elongated magnetic anomaly zone, along to the upward direction of the slope with 6 to 8 m length, was found. On the other hand, we obtained the paleomagnetic and rock magnetic results for the samples from an excavated old kiln, located nearby the magnetic anomaly site. Assuming the buried source of magnetic anomaly in consideration of paleomagnetic data, the expected magnetic field on the ground surface is calculated and it is well consistent between the observation and the calculation. It can be concluded that the source of the magnetic anomaly is a floor of an old kiln buried 40cm below the surface, northwardly magnetized. This result can indicate that the paleomagnetic and rock magnetic results provide a validated information about the underground objects in the magnetic surveys.