OMORI-UTSU LAW ANALYSIS FOR MICROSEISMIC MONITORING IN MINING REGION
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 duri...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/51685 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | 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 |
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