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Utility of aeromagnetic studies for mapping of potentially active faults in two forearc basins: Puget Sound, Washington, and Cook Inlet, Alaska

机译：航空磁学研究在两个前盆地中潜在活动断层的测绘中的作用：华盛顿普吉特海湾和阿拉斯加的库克湾

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摘要

High-resolution aeromagnetic surveys over forearc basins can detect faults and folds in weakly magnetized sed-iments, thus providing geologic constraints on tectonic evolution and improved understanding of seismic hazards in convergent-margin settings. Puget Sound, Washington, and Cook Inlet, Alaska, provide two case histories. In each lowland region, shallow-source magnetic anomalies are related to active folds and/or faults. Mapping these structures is critical for understanding seismic hazards that face the urban regions of Seattle, Washington, and Anchorage, Alaska. Similarities in aeromagnetic anomaly patterns and magnetic stratigraphy between the two regions suggest that we can expect the aeromagnetic method to yield useful structural information that may contribute to earth-hazard and energy resource investigations in other forearc basins.
机译：前盆地的高分辨率航空电磁勘测可以检测到弱磁沉积物中的断层和褶皱，从而为构造演化提供了地质约束，并提高了对聚缘环境下地震危险性的认识。华盛顿的Puget Sound和阿拉斯加的Cook Inlet提供了两个案例历史。在每个低地地区，浅源磁异常都与活动褶皱和/或断层有关。绘制这些结构对于了解华盛顿州西雅图市和阿拉斯加州安克雷奇市市区面临的地震危险至关重要。两个地区之间的航空磁异常模式和地层学相似，这表明我们可以期望航空磁方法产生有用的结构信息，这可能有助于其他前盆地的地球灾害和能源资源调查。

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