Geographically, Indonesia is located in southeast Asia between the Indian and the Pacific Oceans. It is recognized as an active tectonic region because it consists of three major active tectonic plates: the Eurasian plate in the north, the Indo-Australian plate in the south, and the Pacific plate in the east. The southern and eastern parts of the country feature a volcanic arc stretching from the islands of Sumatra, Java, Nusa Tenggara, and Sulawesi, while the remainder of the region comprises old volcanic mountains and lowlands partly dominated by marshes. Territorially, it is located in a tropical climate area, with its two seasons—wet and dry—exhibiting characteristic weather changes, such as with regard to temperature and wind direction, that can be quite extreme. These climatic conditions combine with the region’s relatively diverse surface and rock topographies to provide fertile soil conditions. Conversely, the same conditions can lead to negative outcomes for this densely populated country, in particular, the occurrence of hydrometeorological disasters such as floods, landslides, forest fires, and drought. The 2017 World Risk Report’s ranking of countries’ relative vulnerability and exposure to natural hazards such as earthquakes, storms, floods, droughts, and sea-level rise calculated Indonesia to be the 33rd most at-risk country. Between 1815 and 2018, 23,250 natural hazards occurred here; 302,849 people died or were otherwise lost, 371,059 were injured, and there were 39,514,636 displaced persons, as well as billions of rupiah in losses. The most frequent type of natural hazard has been floods (8,919 instances), followed by cyclones (5,984), and then landslides (4,947).
Following these latest disasters and acknowledging that Indonesia is becoming increasingly vulnerable to such natural hazards, the country’s government established a comprehensive disaster management system. Specifically, it instituted an organization capable of and responsible for handling such a wide-reaching and complex situation as a natural hazard. A coordinated national body had first been developed in 1966, but the current discourse concerning proactive disaster risk management at national and local levels has encouraged the central government to adapt this organization toward becoming more accountable to and involving the participation of local communities. Law No. 24/2007 of the Republic of Indonesia Concerning Disaster Management, issued on April 26, 2007, established a new National Disaster Management Agency (BNPB), but it also focusses on community-based disaster risk management pre- and post-disaster. Through the BNPB and by executing legislative reform to implement recommendations from the international disaster response laws, Indonesia has become a global leader in legal preparedness for natural hazards and the reduction of human vulnerability.
Three cases in Japan occurred by natural hazards and lessons for Natech disaster management