APPLICATION OF TIME-LAPSE DOUBLE-DIFFERENCE TOMOGRAPHY METHOD IN âUCâ UNDERGROUND MINING AREA
Mining activities are activities that change subsurface structures quickly and continuously. The structure changes include changes in pressure distribution, subsidence, and fault shifts. These structural changes cause earthquakes of small to large magnitudes. Therefore, monitoring in the mining a...
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| Format: | Final Project |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/40289 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Mining activities are activities that change subsurface structures quickly and
continuously. The structure changes include changes in pressure distribution,
subsidence, and fault shifts. These structural changes cause earthquakes of small
to large magnitudes. Therefore, monitoring in the mining area is very important to
be done to prevent losses in the form of life and material. One of the things that can
be monitored is the change in the structure of the P wave velocity (Vp) and the S
wave velocity (Vs) below the surface due to mining activities. Double-Difference
Tomography method is applied to obtain the 3D P wave velocity and S wave velocity
structures. This method relocates the location of the earthquake source accurately
and produces a better local speed structure near the sources compared to standard
tomography. Tomographic inversion is carried out on a time-lapse basis to obtain
the velocity structure every month from September 2016 to March 2017. The
tomographic inversion results consistently show low anomalous patterns of Vp and
Vs in the area around the cave which is a result of empty volume and lose stress.
While there are high anomalies Vp and Vs that are distributed around these low
velocities which may be caused by stress redistribution. |
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