Seismological monitoring of the KTB injection project

建议在KTB站点设置一个临时地震台网，以观察拟议的抽水和注入实验期间的诱发地震活动。对诱发地震活动性的精确探测和定位，将有助于研究地震活动性的时空演变，是表征抽注点周围岩石系统应力状态、流体输运性质和稳定性的关键。为了提高信噪比，降低检测阈值，将安装小孔径阵列。在50米及500米深的钻孔内增设地震检波器，以进一步提高探测水平。将采用高精度的绝对和相对定位方法，利用对诱发地震活动的高波形相似度的期望。所提出的高分辨率监测系统将在整个实验过程中每天产生4gbyte的在线数据，这些数据需要实时处理。在一年内建立和运行一个适当的系统是不可能的。因此，我们建议分两个步骤建立一个功能齐全的监测系统，并在本建议中只适用第一部分。

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.