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HISTORY OF GEOLOGY The results show the history of the formation of Merapi stratigraphy is very complex. Wirakusumah (1989) Geology Merapi divides into 2 major groups namely Merapi Merapi Young and Old. Subsequent research (Berthomier, 1990; Newhall & Bronto, 1995; Newhall et.al, 2000) found the stratigraphic units at Merapi are more detailed. According Berthommier, 1990 based on stratigraphic studies, the history of Merapi can be divided into 4 parts: PRE MERAPI (400,000 years ago) Referred to as Mount Aunt with andesitic-basaltic magma ± 700,000 years old located on the eastern slope of Merapi including Boyolali district. Volcanic rocks are andesitic-basaltic aunt but does not contain orthopyroxen. Aunt peak has an altitude of about 2050 m above sea level with flat distance between the peak and the peak of Merapi Bibi is now about 2.5 km. Because of the very old age Mount Aunt experiencing strong alteration so hard to find fresh rock specimens. MERAPI OLD (60000-8000 yea

Among the 129 active volcano located in may be among the most famous Merapi. Many aspects make this volcano interesting than the first course vulkaniknya activity. In addition, Merapi is located in the central part of Java island right in the heart of Javanese culture is thick so that the cultural aspect, mythology and social aspects of politics are also interesting. Including the frequent eruption of Merapi (explode) so as vulkanologis profitable to become a natural laboratory in order to test various equipment and research methodologies. Residents who live on the slopes quite dense causing the Merapi danger level is high. Merapi is a natural phenomenon that can provide a good source of livelihood from the soil fertility and comfort to reside there. Volcanic environments will form a distinctive pattern of society. Communities on the slopes of Merapi based sociological review relatively homogeneous in terms of ethnicity and religion, most still carry the tradition of