OMORI-UTSU LAW ANALYSIS FOR MICROSEISMIC MONITORING IN MINING REGION

• Main Author: Amalia, Rizka
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/51685
• Institution: Institut Teknologi Bandung

Large seismic events in underground mining induce microseismic. There is a shortterm increase of the levels of seismicity which gradually decays, known as aftershock sequence, that potentially causing high risk of damage. Reentry protocol restricts access to the affected areas of large events during the decay of aftershock activity in specific amount of time. In this research, the author develop reentry protocol by analyzing the decay pattern of aftershock sequence based on the former research performed by Vallejos (2017) in Ontario, Canada. Data selection by its magnitude, occuring time, and location are applied to the aftershock sequences to perform curve fitting on its decay pattern to gain the Omori’s Law parameters and calculate the reentry time. Classes of significant event, which being analyzed in “UC” mining field, are independent events, complex events, and event clusters, which differed and occurred contiguously. A total of 32 independent mainshock event is analyzed, obtaining higher values of reentry time compared to the result of previous study. Reentry time and event magnitude are signifcantly related enough in “UC” mining field with the value of determination coefficient is 0,4771