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Imaging Induced Seismicity at the KTB

KTB 的成像诱发地震活动

基本信息

批准号：
21767631
负责人：
Professor Dr. Dirk Gajewski
金额：
--
依托单位：
Institut für Geophysik (IfG)
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2006
资助国家：
德国
起止时间：
2005-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/21767631?language=en
关键词：
Imaging Induced Seismicity KTB

项目摘要

The observation of naturally or artificially generated acoustic emissions (i.e., small earthquakes) by seismic networks is a powerful tool to image transport processes in the earth. During the injection experiments at the KTB a large number of events were observed. The precise spatio-temporal characterization of the seismic events is of utmost importance since all following interpretations (e.g., transport properties) rely entirely on this result. The localization of the events depends on the model used for the localization. The anisotropy of the KTB rocks is a well known feature but was not considered for the localization. Previous studies demonstrate that this leads to severe errors in the location of events. In this study we will first determine the anisotropic elastic features from the comprehensive KTB VSP data sets using 3-D anisotropic tomography for P- and S-waves. This step is essential for the localization. The obtained tomographic anisotropic 3-D model will then be used for the localization of the acoustic emissions of the 2000 and 2004 injection experiments. A newly developed technology based on reversed modelling or time reversed acoustic mirrors will be used to image the events. This techniques does not require picking of events and increases the detection level of the network owing to the stacking character of the method and allows to locate arrivals not visible in the individual seismograms of the network.

观察自然或人工产生的声发射（即，小地震）是一个强大的工具，图像传输过程中的地球。在KTB的注射实验期间，观察到大量事件。地震事件的精确时空表征是最重要的，因为所有以下解释（例如，传输特性）完全依赖于该结果。事件的定位取决于用于定位的模型。KTB岩石的各向异性是一个众所周知的特征，但在定位时没有考虑。以前的研究表明，这会导致事件位置的严重错误。在这项研究中，我们将首先确定各向异性弹性功能的全面KTB VSP数据集使用三维各向异性层析P波和S波。这一步对于本地化至关重要。然后将获得的层析各向异性3-D模型用于2000年和2004年注入实验的声发射的本地化。一种新开发的基于反向建模或时间反向声镜的技术将被用来对事件进行成像。该技术不需要拾取事件，并且由于该方法的叠加特征而提高了网络的检测水平，并且允许定位网络的各个地震图中不可见的波至。