Geologically, the Indonesian archipelago are surrounded by numerous sub-duction zones. This phenomenon causes many of the rock structure to be found in a great complexity, and many of the earthquake sources are scattered in this region. In the other hand, as the tropical country, besides the high rainfall rate, it can be noted as well that the ambient temperature and intensity of ultraviolet rays over a year period are relatively high. This fact, of course, cause great contribution to accelerate the degree of the rock weathering in this region. The circumstances above promote many parts of the Indonesian region to be characterized as the geological hazard area. Consequently, the engineering geological studies are a considerably significant factor to be comprehended in the regional development program. This paper demonstrates the role of the engineering geological studies in the regional development planning in Indonesia, particularly in the areas that are mostly affected by the geological hazard such as Irian Jaya and Bengkulu Province.
Since 35 years ago, a regional development program has been introduced in Indonesia to anticipate the rapid growth in the economic sector, this progress has enabled many areas have to be developed for the new infrastructure requirement. The re-development of the city area may cause the urbanization rate to raise, as a consequence it may create a new problem in city planning. The development of the new area may be considered as the best solution that could solve the over population problem in the city. Basically, the regional development program is planned based on several regional aspects, such as the engineering geological aspect., Due to anticipate the rapid consumption of the infrastructures in Indonesia, in the past this aspect has not been a major consideration in regional development.
