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首页> 外文期刊>Pure and Applied Geophysics >Structural Geometry of a Sector of the Colorado River Delta, Baja California, Mexico, Based on Seismic Reflections
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Structural Geometry of a Sector of the Colorado River Delta, Baja California, Mexico, Based on Seismic Reflections

机译：基于地震反射的墨西哥下加利福尼亚州科罗拉多河三角洲地区的结构几何

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摘要

A structural study in the SW section of the Colorado River delta using seismic reflection data is presented. The study area is located along the Cerro Prieto transform fault, which extends from the northern Gulf of California through the Mexicali Valley and is an active fault within the Pacific-North American plate boundary zone. The research was supported by a database of five seismic profiles with a total length of 215 km, collected in the early 80's by Petróleos Mexicanos. The results show a high density of faults, most of which are buried by sediments. Within the Cerro Prieto fault zone, several faults were identified, such as: Palmas, Mesa, and Pangas Viejas, until now unknown. In addition, even though the Indiviso fault was investigated and superficially identify prior to this work, herein mapped at depth. West of the Cerro Prieto fault zone lies the Las Tinajas basin, bound by the Dunas and Salda?a faults and by the Montague basin to the southeast. The deformation zone along the plate boundary is 18-km-wide, stretching from the Cerro Prieto fault in the east to the Pangas Viejas fault in the west. The orientations of the faults are NW-SE, and if projected from the southern side of the Sierra Cucapah southward, the faults tend to join the Cerro Prieto fault. In the Las Tinajas basin, the acoustic basement is deeper than 5,000 m. Some of the largest vertical displacements generated by the 2010 7.2-Mw El Mayor-Cucapah earthquake occurred southeast of the epicenter and coincided with the location of the Pangas Viejas Fault, which is buried by sediments. Before this event, seismic activity was very low, and no structures were known in the area. In this paper, we demonstrate that there are at least seven major faults that may now pose a high seismic hazard.
机译：提出了利用地震反射数据对科罗拉多河三角洲西南段进行的结构研究。研究区域位于塞罗普列托变换断裂带上，该断裂带从加利福尼亚北部湾一直延伸到墨西卡利山谷，是太平洋-北美板块边界带内的活动断裂带。这项研究得到了PetróleosMexicanos在80年代初收集的，总长度为215 km的五个地震剖面数据库的支持。结果表明，断层密度高，大部分被沉积物掩埋。在塞罗普列托断层带内，发现了几个断层，例如：帕尔马斯，梅萨和潘加斯维耶哈斯，直到现在还未知。此外，即使在进行这项工作之前，对Indiviso断层进行了调查并从表面上进行了识别，但这里还是对其进行了深度绘制。塞罗·普列托断层带以西是Las Tinajas盆地，与杜纳斯和萨尔达亚断层相接，东南与蒙塔古盆地相接。板块边界的变形带为18公里宽，从东部的Cerro Prieto断层延伸到西部的Pangas Viejas断层。断层的方向为NW-SE，如果从塞拉库卡帕（Sierra Cucapah）的南侧向南投影，这些断层往往会汇入塞罗普列托断层。在Las Tinajas盆地，声学地下室的深度超过5,000 m。 2010年7.2兆瓦El Mayor-Cucapah地震产生的一些最大垂直位移发生在震中东南方，与Pangas Viejas断层的位置重合，后者被沉积物掩埋。在此事件之前，地震活动非常低，该地区没有已知的结构。在本文中，我们证明了至少有七个主要断层现在可能构成很高的地震危险。

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