The Crittenden County fault zone (CCFZ) is a potentially active fault zone located within 25 km of Memphis, Tennessee, and poses a significant seismic hazard to the region. Previous research has associated the fault zone with basement faults of the eastern Reelfoot rift margin (ERRM) and described it as a northeast‐striking, northwest‐dipping reverse fault. However, we suggest that there is an incomplete understanding of the fault geometry of the CCFZ and the ERRM in this region due to significant gaps in seismic reflection profiles used to interpret the fault systems.To improve our understanding of the structure of both fault systems in this region, we apply two processing techniques to gridded aeromagnetic data. We use the horizontal gradient method on reduction‐to‐pole magnetic data to detect magnetic contacts associated with faults as this technique produces shaper gradients at magnetic contacts than other edge detection methods. For depth to basement estimations, we use the analytic signal as the method does not require knowledge of the remnant magnetization of the source body.We suggest that the CCFZ extends approximately 16 km farther to the southwest than previously mapped and may be composed of three independent faults as opposed to a continuous structure. To the northeast, we interpreted two possible faults associated with the ERRM that intersect the CCFZ, one of which has been previously mapped as the Meeman–Shelby fault. If the CCFZ and the eastern rift margin are composed of isolated fault segments, the maximum magnitude earthquake that each fault segment may generate is reduced, thereby, lowering the existing seismic hazard both fault systems pose to Memphis, Tennessee.

中文翻译：

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克里滕登县断层带的航磁解释

克里滕登县断层带（CCFZ）是位于田纳西州孟菲斯25公里以内的潜在活动断层带，对该地区构成了重大地震危险。先前的研究将断层带与东部Reelfoot裂谷边缘（ERRM）的基底断层相关联，并将其描述为东北向，西北向倾覆的反向断层。但是，由于用于解释该断层系统的地震反射剖面中存在较大的间隙，因此我们建议对该区域的CCFZ和ERRM断层几何结构不完全了解。在这个区域，我们将两种处理技术应用于栅格化的航空磁数据。我们使用归一化极磁数据的水平梯度方法来检测与故障相关的磁接触，因为该技术比其他边缘检测方法在磁接触处产生整形梯度。对于地下室的深度估计，我们使用分析信号，因为该方法不需要了解源体的剩余磁化强度。我们建议CCFZ比以前绘制的地图向西南延伸约16 km，可能由三个独立的区域组成与连续结构相反的断层。在东北部，我们解释了与ERRM相关的与CCFZ相交的两种可能的断层，其中一种以前被映射为Meeman-Shelby断层。如果CCFZ和东部裂谷边缘由孤立的断层段组成，