Summary

We have applied our approach for microseismic imaging to the data obtained from the German Continental Deep Drilling program (KTB project), 2004 experiment. This is a continuous data stream containing induced microseismicity data recorded at a single 3C geophone located at approximately 3.5 km depth. Using P- and S- time picks we have located 414 microseismic events using data from the borehole geophone and from near-surface stations. Since microearthquakes occur not at the same time, we have managed to separate continuous data stream recorded at the receiver to the number of 3C traces containing waveforms from different events. Using these traces we have produced seismic gather for the microseismicity cloud. We apply our imaging approach to the produced seismic gather and construct 3D images of the seismic data between P- and S- direct waves which we interpret as PP reflections. There is a complicated network of the reflectors revealed within the microseismicity cloud which belong to SE2 reflector. In order to check consistency of the obtained results, we compare our results with seismic attributes obtained from the surface seismic 3-D depth migrated image. Obtained result is mainly consistent with seismic attributes by the location and dip, furthermore it provides with more detailed image of the fault zone fine structure. Microseismicity location The long-term experiment in the KTB pilot hole at 4 km depth started at May 27, 2004. Injection rate was constant at 200 l/min, interrupted by several short-term pump failures (see Shapiro et al. (2006)). The cumulative volume o