论文部分内容阅读
以地貌形迹为基础的遥感和摄影地质学方法一般可用于识别高角度断层。平移断层制图一般可用辅助信息,如地形和重力数据而使之得到提高。由于大多数断层体系由不连续断层形迹所组成的,因此阶梯状迭置(Step—over)的变形模式表明了断层位移的特征。一旦平移断层体系以位移被准确的辨认,那么断层形迹的几何形状可用来预测所需要进行勘测的盆地形成区。利用陆地卫星图像、地形数据和重力数据证实了两个平移断层体系的构造特征,这两个平移断层体系是拉斯维加斯(Las Vegas)附近的左旋米德湖断层体系和右旋拉斯维加斯剪切带。平移断层体系显示离散的、间断的断层段,各段的相互作用产生的区域的和局部的变形与平移断层的运动相一致。爱克(Echo)山脉为位于左旋断层的右阶梯状迭置的上推地形。奥弗丹阿尔穆(Overton Arm)是一个张性阶状迭置所构成的深断裂盆地。用区域重力异常数据识别的三个清晰的盆地在右旋阶内排列成一条直线,且解释为拉斯维加斯谷剪切带的不连续的右旋小断层所构成。
Remote sensing and photographic geology based on topographical features can generally be used to identify high-angle faults. Pan-tomography can generally be enhanced with ancillary information, such as topographic and gravity data. Because most fault systems consist of discontinuous faults, the step-over deformation pattern indicates the characteristics of fault displacement. Once the translational fault system has been accurately identified for displacement, the geometry of the fault footprint can be used to predict the basin formation area that is to be surveyed. The structural features of two translational fault systems were confirmed using land-satellite imagery, topographic data and gravitational data. These two translational fault systems are the L-Mead Lake fault system near Las Vegas, Vegas shear band. The translational fault system shows discrete and discontinuous fault segments, and the regional and local deformations resulting from the interaction of the segments are consistent with the translational faults. The Echo Range is a push-up terrain that is located on the right-hand ladder in the L-Fault. The Overton Arm is a deep fractured basin made up of zonal steps. The three distinct basins identified by regional gravity anomalies are aligned in a right-handed order and interpreted as a discontinuous dextral small fault of the Las Vegas Valley shear zone.