Abstract We present 2D seismic reflection images covering 64 km along with 62.5 km of gravity and aeromagnetic models. The modeled region extends from the Cerro Prieto volcano, across the Mexicali Valley, Baja California, Mexico, to the USA-Mexico border near Pilot Knob, California, USA. The seismic images illustrate the shallow structure to the north of the Cerro Prieto basin, and a seismic reflector in the northeastern part of the profiles corresponds to the metamorphic basement. Some major faults were identified through discontinuities in the reflectors (Dunes and San Luis faults), while others (Michoacan, Imperial, and Calipatria faults) are expressed as chaotic low-amplitude anomalies in the seismic images. 2D gravimetric and aeromagnetic models constrained by seismic data demonstrate the presence of zones of sediments metamorphosed by hydrothermal alteration fronts due to major faults and intrusions. We present for the first time a geologic model supported by geophysical data that cover transversely the entire Mexicali Valley. Finally, we identify three domains for future geothermal exploration in the Mexicali Valley, supported by the analytic signal of the aeromagnetic data after reduction to the pole and seismic reflection profiles from previous papers.

中文翻译：

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二维地震成像和联合重力-航磁建模揭示了帝国和墨西卡利河谷之间地热场的延伸

摘要 我们展示了覆盖 64 公里的二维地震反射图像以及 62.5 公里的重力和航磁模型。模拟区域从 Cerro Prieto 火山，穿过墨西哥下加利福尼亚州的墨西卡利山谷，一直延伸到美国加利福尼亚州 Pilot Knob 附近的美墨边境。地震图像显示了 Cerro Prieto 盆地北部的浅层构造，剖面东北部的地震反射层对应于变质基底。通过反射层的不连续性（沙丘和圣路易斯断层）识别出一些主要断层，而其他断层（米却肯断层、帝国断层和卡利帕特里亚断层）在地震图像中表现为混乱的低振幅异常。受地震数据约束的二维重力和航磁模型表明，由于主要断层和侵入，存在由热液蚀变前沿变质的沉积物带。我们首次提出了一个由地球物理数据支持的地质模型，该数据横跨整个墨西卡利河谷。最后，我们确定了墨西卡利河谷未来地热勘探的三个领域，这些领域得到了以前论文中减少到极点和地震反射剖面后的航磁数据分析信号的支持。