ABSTRACT A study of the fracture systems in the basement of the Matatlan urban waste dump of Guadalajara City, near the western edge of the Rio Grande de Santiago canyon (southwestern Mexico), is reported. The Matatlan dumpsite was developed on top of andesitic and rhyolitic rocks. Measurements at outcrops indicated that N–S (0°–15° and 165°–180°), N45–90E and N105–135E fracture systems affect the basement. Statistical analysis (micromagnetic method) of magnetic lineament azimuths indicated the presence of two lineament groups. The major one (N60–120E) has a maximum at N90–105E, and a secondary group (N120–165E). The gravity anomalies are featured by a major group (N60–120E, with maximums at N60–75E, and N105–120E) and a secondary group (N120–180E). Thus, a good to fair correlation exists between the measured fracture orientations and the lineaments featuring the gravity and magnetic anomalies. Horizontal derivative and tilt angle depicted horizontal limits of anomaly‐causative bodies. Results of the micromagnetic method are consistent with fracture orientations and with the limits established through edge‐detection techniques. Lineaments established by means of the gravity and magnetic Euler deconvolution are also consistent. Gravity and magnetic Euler deconvolution helped to estimate the depth extent of the limits of gravity and magnetic common sources. Euler deconvolution indicated the fault or contact nature of these lineaments. Furthermore, Euler deconvolution indicated slopes of the limits of gravity and magnetic sources. The fault or fracture nature of the major lineaments was finally confirmed by forward modelling (forward 2D cooperative modelling of gravity and magnetic profiles). For example, lineaments delimiting the northern depression could be characterized as normal faults. In general, this study indicates that it is possible, based on gravity and magnetic data, to characterize fractures affecting the basement of a dumpsite, a key parameter in hydrogeophysical studies. In particular, through this study, the inferred structures could be associated with regional tectonic faulting, which might provide migration paths to unhealthy lixiviate outside the dumpsite, giving rise to the contamination of the neighbouring environment. In particular, the study explains the presence of an unhealthy leachate waterfall to the northeast of the dumping site. Heavy metal contents in samples from this waterfall support that lixiviates originate at the dumpsite.

中文翻译：

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使用重力和磁异常的高级分析在垃圾场推断地下室断层

摘要报道了一项关于瓜达拉哈拉市马塔特兰城市垃圾场地下室裂缝系统的研究，该城市靠近里奥格兰德圣地亚哥峡谷（墨西哥西南部）的西部边缘。Matatlan 垃圾场是在安山岩和流纹岩之上开发的。露头测量表明，N-S（0°-15°和165°-180°）、N45-90E 和 N105-135E 裂缝系统影响基底。磁性线条方位角的统计分析（微磁法）表明存在两个线条组。主要组 (N60-120E) 在 N90-105E 处达到最大值，次要组 (N120-165E)。重力异常以一个主要群（N60-120E，最大值在 N60-75E 和 N105-120E）和一个次要群（N120-180E）为特征。因此，测量的裂缝方向与具有重力和磁异常特征的线条之间存在良好的相关性。水平导数和倾斜角描绘了异常原因体的水平极限。微磁方法的结果与裂缝方向和通过边缘检测技术建立的限制一致。通过重力和磁欧拉反褶积建立的线条也是一致的。重力和磁欧拉反褶积有助于估计重力和磁共同源极限的深度范围。欧拉反褶积表明了这些线条的断层或接触性质。此外，欧拉反褶积表明重力和磁源极限的斜率。主要线条的断层或断裂性质最终通过正向建模（重磁剖面的正向二维协同建模）得到确认。例如，界定北部坳陷的线条可以被描述为正断层。总的来说，这项研究表明，根据重力和磁力数据，可以表征影响垃圾场基底的裂缝，这是水文地球物理研究的一个关键参数。特别是，通过这项研究，推断的结构可能与区域构造断层有关，这可能为垃圾场外不健康的浸出液​​提供迁移路径，从而导致对邻近环境的污染。该研究特别解释了垃圾场东北部存在不健康渗滤液瀑布的原因。