A Comparative Study of Archaeomagnetic Dating Results on the Korean Peninsula Based on Paleosecular Variation Models; [영년변화 모델에 따른 한반도 고고지자기 연대측정 결과의 비교 연구]

초록

Archaeomagnetic dating relies on regional paleosecular variation (PSV) models that accurately describe temporal changes in geomagnetic field direction. On the Korean Peninsula, archaeomagnetic age estimates have traditionally been based on the KPSV_v1.0 model, which incorporates directional data from both Korea and neighboring regions. However, limitations remain in representing region-specific geomagnetic directional variations for certain periods. In this study, we evaluate the performance of a newly developed PSV model, KPSV3K, constructed exclusively from archaeomagnetic directional data obtained on the Korean Peninsula, by comparing archaeomagnetic dating results derived from KPSV3K with those obtained using KPSV_v1.0. Mean archaeomagnetic directions were obtained from independent archaeological sites and selected to satisfy standard reliability criteria commonly applied in archaeomagnetic studies, including stable characteristic remanent magnetization components identified through stepwise alternating field demagnetization. Comparison of archaeomagnetic dating results reveals that the number of possible age intervals, their temporal extents, and the structure of associated probability density distributions vary among sites. Where mean archaeomagnetic directions are well resolved for specific periods within the PSV curves, both models yield comparable central age estimates. In contrast, when similar geomagnetic directions recur at multiple periods, archaeomagnetic dating results produce multiple age solutions regardless of the model applied. Notably, in several cases where age estimates derived from KPSV_v1.0 are distributed over broad or multiple time intervals, the application of KPSV3K constrains the age solutions to narrower and more clearly defined temporal ranges. These results indicate that KPSV3K more accurately represents regional geomagnetic directional variations of the Korean Peninsula during specific periods (e.g., the Goryeo Dynasty) and provides improved constraints on archaeomagnetic age estimates compared to the previous model. © 2025 The Korean Society of Engineering Geology.

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