The San Blas Basin (SBB) is located within what is referred to as the Mazatlán Basin, in the offshore west of Mexico. The SBB is positioned in the southern part of the Mazatlán Basin, within a region that remains poorly understood. Specifically, details about its shape and size are currently unknown, and only a few studies have provided some understanding of its limits. To ascertain the extent of the SBB and define its boundaries, we employed satellite-derived gravity and magnetic models, along with analyses linked to these fields. We established structural continuity through spectral analyses of gravimetric and magnetic data and the interpretation of various published seismic profiles in the near area. We also applied various filtering techniques, including the removal of regional trends and the regional Gaussian filter. Some anomalies of the potential fields are repeatedly reproduced in the different processed maps. These features allow for a comprehensive geophysical interpretation of the area under consideration, which leads to the proposal of the boundaries of the SBB. Additionally, 3D inversions of gravimetric and magnetic data were carried out in the study area. From these data, a more detailed response was observed in the 3D gravimetry than in the 3D magnetometry. In the former, it was possible to characterize a series of high-density and low-density bodies that were arranged in defined orientations, which were associated with the migration processes of Baja California from its position 30 Ma to its current position. A pattern of progressive evolution of the basin is given, from 30 Ma to the Present.

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合并重力、磁力和地震数据，描绘墨西哥圣布拉斯盆地的边界

圣布拉斯盆地 (SBB) 位于墨西哥西部近海的马萨特兰盆地内。SBB 位于马萨特兰盆地南部，该地区目前仍知之甚少。具体来说，有关其形状和大小的细节目前尚不清楚，只有少数研究对其局限性提供了一些了解。为了确定 SBB 的范围并定义其边界，我们采用了卫星衍生的重力和磁力模型，以及与这些场相关的分析。我们通过重力和磁力数据的频谱分析以及对附近地区各种已发表的地震剖面的解释建立了结构连续性。我们还应用了各种过滤技术，包括去除区域趋势和区域高斯过滤器。势场的一些异常现象在不同的​​处理图中重复再现。这些特征允许对所考虑的区域进行全面的地球物理解释，从而提出 SBB 边界的建议。此外，还在研究区域进行了重力和磁力数据的 3D 反演。从这些数据中，3D 重力测量比 3D 磁力测量观察到更详细的响应。在前者中，可以表征一系列按确定方向排列的高密度和低密度物体，这些物体与下加利福尼亚州从 30 Ma 位置到当前位置的迁移过程相关。给出了盆地从 30 Ma 到现在的渐进演化模式。