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| | Abstract | | In the magnetic exploration field, we are sometimes suffered from the intense magnetic field due to artificial obstacles such as guard rails along the road, ditches made by iron and concrete, metal nets or wires to prevent collapsing the rock wall, and so on. A method of removal of such artificial noises is introduced here. The method of reduction is fitting the noise data into theoretical magnetic field producing by magnetic dipoles using a kind of inversion by the Marquardt method. These reductions of magnetic noises are applied to practical data at a field of a pottery site where the magnetic anomalies due to thermal remanent magnetization are expected. The selected site is the Shiraiwa pottery vestige in Senboku city, Akita prefecture. The production of potteries, however, had ceased more than one hundred years ago. In the vicinity of the pottery vestige, now a ditch made by concrete and iron is there for use of supplying the water for agriculture. Due to irons included by the ditch, intense magnetic field are produced and it becomes sometimes noise for positioning the old kilns by magnetic exploration. |
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