标题： 在智利俯冲带阿塔卡马段（24$^\circ$S-31$^\circ$S）进行的构造震颤和低频地震的系统性搜索没有发现任何结果 显示英文标题

标题： A systematic search for tectonic tremor and low-frequency earthquakes in the Atacama segment of the Chilean subduction zone (24$^\circ$S-31$^\circ$S) turns up empty

摘要： 俯冲带逆冲断层不仅通过地震释放应力，还通过蠕动和瞬态缓慢变形（称为慢滑事件SSEs）释放应力。理解快速滑动和缓慢滑动之间的相互作用对于阐明俯冲界面的形变过程至关重要。智利俯冲边缘虽然是全球最活跃的地震区域之一，但关于SSEs的报告很少。此外，还没有关于构造震颤或低频地震（LFEs）的全面报告，这些地震信号通常伴随SSEs出现，用于追踪小空间和时间尺度上的形变。在此，我们对北智利的阿塔卡马段进行了系统搜索，该地区同时存在浅层和深层SSEs。使用密集的地震网络，我们研究了2020年11月至2024年2月之间的3.5年数据。由于网络几何结构，我们重点关注深层震颤和LFEs。我们应用了两种正交方法，即震颤搜索的包络相关性和LFEs的深度学习检测，以生成初始目录。为了验证潜在的检测结果，我们使用聚类、匹配滤波、启发式方法和广泛的手动检查。尽管我们的初步搜索提供了大量候选者，但在验证后，我们在该地区没有发现构造震颤或LFEs的证据。相反，我们的方法在智利以外的两个已知震颤和LFE活动的参考区域中成功恢复了震颤和LFEs。我们的观察结果显示，北智利的震颤和LFEs的矩率低于其他地区，复发率显著更长，或者根本不存在，这可能是由于冷俯冲造成的。 显示英文摘要

摘要： Subduction megathrusts release stress not only seismically through earthquakes, but also through creep and transient slow deformation, called slow slip events (SSEs). Understanding the interplay between fast and slow slip is essential for illuminating the deformation processes on the subduction interface. The Chilean subduction margin, while one of the most seismically active regions worldwide, has few reports of SSEs. Furthermore, there are no comprehensive reports of tectonic tremors or low-frequency earthquakes (LFEs), seismic signals typically accompanying SSEs, tracking deformation at small spatial and temporal scales. Here, we perform a systematic search for tectonic tremors and LFEs in the Atacama segment in Northern Chile, a region hosting both shallow and deep SSEs. Using dense seismic networks, we investigate 3.5 years between November 2020 and February 2024. Due to the network geometry, we focus on deep tremor and LFEs. We apply two orthogonal methods, envelope correlation for tremor search and deep learning detection for LFEs, to generate initial catalogs. To validate the potential detections, we use clustering, matched filtering, heuristics, and extensive manual inspection. While our initial search provides numerous candidates, after verification, we find no evidence for tectonic tremor or LFEs in the region. In contrast, our approaches successfully recover tremors and LFEs in two reference regions outside Chile with known tremor and LFE activity. Our observations show that tremors and LFEs in Northern Chile are either of lower moment rate than in other regions, have substantially longer recurrence rates, or are absent altogether, potentially due to the cold subduction.