Stress Estimation to Mid-Crustal Depth in the KTB Drillhole and In Situ Stress and Heat Flow Measurements in Eastern Europe

关于地壳应力大小的知识 是岩石圈广泛问题的基础 力学 这是一个进行原地应力测量的项目 在KTB科学钻孔中， 卡尔斯鲁厄大学 以前从来没有可能 测量近中地壳深度的原地应力。 如果这样 如果测量成功，它将提供机会， 测试这些基本概念，如假设压力水平 与摩擦强度处于平衡状态 根据简单断层理论和实验室测定 摩擦系数的值。 在与卡尔斯鲁厄大学的相关合作中， (and位于波茨坦、德国和美国的Geoforschung Zentrum（GFZ） 首席研究员将实施一项新的 东欧测量原地应力的研究计划 方向和热流（以及其他地球物理 测量）在东欧和前苏联的钻孔 联盟 本研究的基本思路是利用一个近- 新的（几乎完全装备的）地球物理测井系统 由GFZ收购，用于现有钻孔。 地应力 方位将根据钻孔的详细分析确定 电视测量 随着时间的推移，这些测量将有助于 填补了应力方向知识的巨大空白 和相对大小。 美国地质调查局将 各国的调查人员将在这方面进行合作， 孔位于其中。

Knowledge of the magnitudes of stresses in the earth's crust is fundamental to a broad range of problems of lithospheric mechanics. This is a project to make in situ stress measurements to ~10 km depth in the KTB scientific drillhole in cooperation with the University of Karlsruhe. It has never before been possible to measure in situ stress at nearly mid-crustal depth. If such measurements are successful, it will provide the opportunity to test such fundamental concepts as the hypothesis that stress levels in the brittle crust are in equilibrium with frictional strength as defined by simple faulting theory and laboratory-determined values of the coefficient of friction. In a related collaboration with the University of Karlsruhe (and Geoforschung Zentrum (GFZ), in Potsdam, Germany and the U.S. Geological Survey), the Principal Investigator will implement a new research program in eastern Europe to measure in situ stress orientation and heat flow (as well as other geophysical measurements) in boreholes in eastern Europe and the former Soviet Union. The basic idea of this research is to utilize a nearly- new (and nearly fully-outfitted) geophysical logging system acquired by GFZ for use in existing boreholes. In situ stress orientation will be determined from detailed analysis of borehole televiewer measurements. Over time, these measurements will help fill an extremely large gap in knowledge of stress orientations and relative magnitudes. The U.S. Geological Survey will collaborate in this effort as will investigators from the countries in which the holes are located.