Introduction
Mount Merapi (2968m asl) is located in Central Java on the geographical position 110º26'30'' East Longitude and 7º32'30'' South Longitude, is a type of strato volcanoes most active in Indonesia. Since in 1672 and 2010 recorded more than 80 times the eruption, with an interval of rest between 1-18 years or an average of 4 years. The mountain is located in the District of Sleman, Magelang, Klaten and Boyolali. District of Boyolali which is in Central Java (between 110º22'-110º50' East Longitude and 7 º7'-7º36' South Longitude) has an area approximately 4.5% of Central Java. North and west area is mountains, the slope of Mount Merapi with a height of about 1.500 meters above sea level. The population living in the danger zone of Mount Merapi, some 226,618 people covering 57 villages with a total area of 314.7 km2 and density per km2. In detail, the people in Boyolali who inhabited the area affected by the eruption Merapi is presented in the table below.