SEISMICITY ANALYSIS AT NORTH MOLUCCA BASED ON HYPOSENTER DISTRIBUTION DATA AND b-VALUE

• Main Author: ( NIM : 22411319 ); Pembimbing : Dr. Andri Dian Nugraha, S.Si, M.Si, HERMIZAL
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/18640
• Institution: Institut Teknologi Bandung

During period of July 2009 – Desember 2012, the number of 2362 earthquakes in North Molucca can be relocated by using the Double Difference method, the result of hypocenter relocation showed significant change of earthquake location, especially the depth of focus of the earthquake, so it can provide a firmer description of the structure of the existing slab underneath. The complexity of the existing slab structure makes North Molucca as a region to be awared of the impact of major earthquake disaster. <br /> <br /> <br /> <br /> <br /> <br /> <br /> This study was analyzed the a-value and b-value as one of the mitigation effort seismicity in this region, the low of b-value is often associated with large local stress deposits and the a-value is associated with level of seismic activity of a region. The low of a-value and b-value was observed around the Molucca Sea, especially in the southeast Minahasa Peninsula and around Bacan Island and Obi Island. Low of a-value and b-value in the same area indicated that in that area there is accumulation of energy which raises the high of stress level. There is not too different result between analysis of a-value and b-value based on pre-relocation hypocenter data with longer time period, it reveals the region is zone most likely for earthquake with the large magnitude.