科研之友
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摘要
The utilization of the deep underground at 1-5 km depth (e. g. fluid disposal, deep geothermal power plants, hydrocarbon production) may induce seismicity. In Germany induced seismicity is discussed in the public and the media after several perceptible earthquakes with local magnitudes up to M-L = 3.4 occurred at geothermal power plants in Landau, Insheim, Unterhaching and Basel (Switzerland). The unexpected strong induced earthquakes caused a severe loss of acceptance for these projects in the local population. These experiences demonstrate that new utilizations of the deep underground in urbanized areas need transparent and comprehensive concepts for the communication of induced seismicity and the assessment of minor damages at buildings after the occurrence of perceptible earthquakes. We analyze 35 earthquakes with local magnitudes between 0.7 and 2.7 which were induced at the geothermal power plant in Landau, SW Germany, at about 3 km depth. Especially we study relationships of local magnitude with perceptibility and potential to cause damages to buildings. The assessment of the observed ground motions is based on the concepts and indicative values of the German industry standard DIN 4150 which is dealing with the impacts of vibrations caused by construction activity on humans and buildings. We show that the ground motions of the analyzed induced earthquakes with local magnitudes exceeding M-L similar to 1.3 can be perceptible in Landau. The ground motions due to the two strongest earthquakes with local magnitudes of M-L = 2.7 and M-L = 2.4 reach the indicative value (3 mm/s) for potential damages at very sensitive buildings in Landau.
- 出版日期2013-9
