Construction of new archaeointensity reference curve for East Asia from 200 CE to 1100 CE

摘要: Abstract Archaeomagnetism is a research area that reconstructs ancient geomagnetic fields mainly using baked samples (especially artifacts) containing magnetic minerals such as magnetite and hematite. can be applied to reveal temporal changes in the field related deep-earth dynamics, estimate age of archaeological remains artifacts. Reconstruction methods for intensity (archaeointensity) continue develop rapidly, with various experimental having been proposed since 2000. The Tsunakawa-Shaw method one latest methods. was reconstruction archaeointensity large number clay belonging different ages from relics Osaka Prefecture, Japan, new reference curve constructed. archaeointensities 98 specimens 39 kilns were estimated. These data screened compiled each pottery sequence, finally 6 mean values sequence level obtained. All satisfied selection criteria, which indicates they have sufficient reliability. It notable these newly estimated are lower than those previous studies Japan. On other hand, show complementary trend dataset obtained by IZZI-Thellier reported Korea recently. We combined Japan this study Korea, drew an interpolation construct East Asia covering ca. 200 CE 1100 CE. This includes events decrease increase occurred around 610 CE 950 CE, characteristic pattern variation found study.