Abstract
Three types of volcanic materials of Mount Agung Bali Indonesia, i.e., volcanic ash, sand, and gravel have been tested magnetic susceptibility using a Bartington MS2B susceptibility meter. Of the three types of materials, volcanic ash has one order lower of the magnetic susceptibility of about 7.7×10−6 m3kg−1 than that of sand and gravel which have magnetic susceptibility ranging from 14.1 to 26.8×10−6 m3kg−1. Based on the χif Vs. χfd analysis, it can be seen that magnetic minerals contained in the volcanic ash have dominated the stable single domains (SSD), while magnetic minerals in sand and gravel have dominated by multidomain (MD). The domain distribution of the magnetic mineral in various sizes of volcanic materials from Mount Agung of naturally approximates the exponential form.
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