Seismological monitoring of the KTB injection project

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It is proposed to install a temporary seismological network at the KTB site to observe the induced seismicity during the proposed pumping and injection experiments. Precise detection and localization of the induced seismicity will enable investigations on the spatial-temporal evolution of the seismicity and will be a key point to characterize the stress state, fluid transport properties and stability of the rock system around the pumping/injection point. Small aperture arrays will be installed for increasing the signal to noise ratio and lowering the detection threshold. Additional seismometers will be placed in 50m and 500m deep boreholes to further increase the detection level. High precision absolute and relative location methods will be used which exploit the high waveform similarity expected for the induced seismicity. The proposed high-resolution monitoring system will produce 4 GByte on-line data per day which have to be processed in real time during the duration of the whole experiment. It is not possible to setup and operate an adequate system within one year. Hence we suggest a two step procedure to establish a full featured monitoring system and apply within this proposal only for the first part.