Microearthquakes detection by synthetic template matching
| Thesis title in Czech: | Detekce mikrozemětřesení s pomocí korelací syntetických vzorů |
|---|---|
| Thesis title in English: | Microearthquakes detection by synthetic template matching |
| Academic year of topic announcement: | 2019/2020 |
| Thesis type: | dissertation |
| Thesis language: | angličtina |
| Department: | Institute of Hydrogeology, Engineering Geology and Applied Geophysics (31-450) |
| Supervisor: | prof. RNDr. Tomáš Fischer, Ph.D. |
| Author: | hidden - assigned by the advisor |
| Date of registration: | 19.10.2019 |
| Date of assignment: | 19.10.2019 |
| Guidelines |
| Seismologie Šíření seismických vln Obrácené úlohy |
| Preliminary scope of work |
| Microsiesmic monitoring is a key tool for assessment of seismic activity of the studied area, and its seismogenic potential. This is crucial in monitoring of large structures as power plants and water reservoirs and industry operations similar to production of oil and gas and utilization of geothermal energy. In similar situations it is of importance to determine the natural microseismic activity prior to starting the operations so that the anthropogenic effect to the rock volume can be evaluated. In seismic recordings microseismic events are detected using various methods ranging from interactive scanning by human operator to sophisticated automatic algorithms on the other end. Nowadays the template matching methods have experienced fast development and resulted in significant lowering of the detection threshold. These methodsare based on systematic scanning of the continuous recordings for waveforms of already known earthquakes using cross-correlation approach. This method however fails if template waveforms are missing, which is the case of newly instrumented areas. To overcome this gap, we propose to use a combination of the so-called source scanning algorithm with template matching method. It will apply thetemplate matching approach using synthetic template seismogramscalculated for 3D grid of potential hypocenters covering the studied rock volume. The method will be simultaneously tested in two areas. Design and proper setting willbe verified on the data from the WEBNET, which monitors the seismoactive area of West Bohemia. Application of the method will be on data from local seismic network in the area of Litoměřice, where an EGS project is under development, will help to reveal the possible natural microseismicity prior to starting of the operations |
| Preliminary scope of work in English |
| Microsiesmic monitoring is a key tool for assessment of seismic activity of the studied area, and its seismogenic potential. This is crucial in monitoring of large structures as power plants and water reservoirs and industry operations similar to production of oil and gas and utilization of geothermal energy. In similar situations it is of importance to determine the natural microseismic activity prior to starting the operations so that the anthropogenic effect to the rock volume can be evaluated. In seismic recordings microseismic events are detected using various methods ranging from interactive scanning by human operator to sophisticated automatic algorithms on the other end. Nowadays the template matching methods have experienced fast development and resulted in significant lowering of the detection threshold. These methodsare based on systematic scanning of the continuous recordings for waveforms of already known earthquakes using cross-correlation approach. This method however fails if template waveforms are missing, which is the case of newly instrumented areas. To overcome this gap, we propose to use a combination of the so-called source scanning algorithm with template matching method. It will apply thetemplate matching approach using synthetic template seismogramscalculated for 3D grid of potential hypocenters covering the studied rock volume. The method will be simultaneously tested in two areas. Design and proper setting willbe verified on the data from the WEBNET, which monitors the seismoactive area of West Bohemia. Application of the method will be on data from local seismic network in the area of Litoměřice, where an EGS project is under development, will help to reveal the possible natural microseismicity prior to starting of the operations |