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Magnetic susceptibility is the degree to which a material can be magnetized in an external magnetic field. On volcanic area, magnetic susceptibilities value can be changed with time. When susceptibilities value of volcanic rock is affected with temperature of rock, susceptibilities value can be changed from the eruption of volcanic mountain until the rock cools down quickly. But alteration of rock due to heat factor or material coming up to surface like geothermal manifestation may change the magnetic susceptibility value on the rock. In this research we used 130-point on years “A” and years 2020 (validated on 6 blocks as a zone of interest) to know the effect of magnetic susceptibility changes with temperature changes on reservoir.