Geomagnetic Inclination during Last 9,000 Years Recorded in Sediment Cores from Lake Kasumigaura, Japan

Abstract

Investigation of Holocene geomagnetic secular variation using unconsolidated sediments has been made by many authors in recent years, and type curves have been constructed in North America, West Europe, Argentina and Australia (Creer et al., 1983; Creer and Tucholka, 1983). In Japan, the secular variation curve for recent 2,000 years has already been established by archaeomagnetic investigations (Hirooka, 1971; Shibuya, 1980), but for the period before 2,000 yr B.P., several works (Yaskawa et al., 1973; Hirooka and Tokieda, 1979; Hyodo and Yaskawa, 1980; Inokuchi et al., 1981) have not yet been able to establish a reliable variation curve due to the lack of sufficient data. This paper presents a reliable record of geomagnetic inclination in Japan since 9,000 yr B.P. based on the paleomagnetism of two sediment cores from Lake Kasumigaura. © 1985, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.