About 100 year variations are found in the field direction of the Matuyama-Brunhes transition. The analysed data are composed of the palaeomagnetic directions from the marine sediment in the Boso Peninsula, whichpreciselyrecordedthe Matuyama-Brunhes transition with a very high accumulation rate (3.7 mm/yr). The section is tentatively divided into two subsections from the directional change, where the main reversal and the rebound occurred in the early stage (subsection I) and subsequently the field directions show moderate changes in the late stage (subsection II). Applying the Bayesian smoothing method to the directions spanning about 4100 years, the inclination, declination and angular changes in the transition field imply short-period components of the order of 102 years. After removing long-term trends, the maximum entropy method was employed for the detection of short-period variations. The results of the spectral analyses suggest the 60-80 year and the 120-150 year periodicity in the subsections of I and II, respectively. The main reversal and the subsequent rebound seem to have been accomplished for short intervals of about 200 and 300 years, respectively. These rapid variations of the order of 102 years are suggested to be a substantial feature of the transition field. © 1995, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.
CITATION STYLE
Tsunakawa, H., Okada, M., & Niitsuma, N. (1995). About 100 Year Directional Variations in the Matuyama-Brunhes Transition Field Inferred from the Sedimentary Records in the Boso Peninsula, Japan. Journal of Geomagnetism and Geoelectricity, 47(3), 337–345. https://doi.org/10.5636/jgg.47.337
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