Archeointensity results on 13 - 17th century stonewares excavated from Kyoto

In last decade, High temporal resolution archeointensity data have been accumulated particularly in Europe. To further decipher geomagetic field behaviors, archeomagnetic data from geographically remote areas from Europe are indispensable. In eastern Asia a variety of archeological artifacts are readily available, but archeointensity data later than 13th century are still limited. Here we present new archeointensity data from stonewares excavated in our university's campus, which is located just north of the ancient place in Kyoto. The ages were estimated based on archeological constraints and range from 13th to 17th centuries. Low-Ti titanomagnetite and high-Ti titanohematite were observed in many stonewares using a Curie balance. In successful Thellier archointensity experiment, specimens showed linear segments on Arai diagrams in wide temperature ranges and these samples did not show clear presence of high-Ti titanohematite. To confirm the reliability of the archeointensity data, we checked TRM anisotropy and its cooling rate dependance. Our Archeointensity data in Japan indicates a rapid decrease in 16th century. Schnepp et al., [2009] showed a similar decrease between the 17th and 18th century in Europe. These new results suggest that the contribution of non-dipole component of geomagnetic field cannot be ignored and high temporal resolution archeointensity data from outside Europe are quite important.