Integrating Fault Slip Observations of Earthquake Swarms, Tectonic Tremor, and Slow Slip in Alaska and the Aleutians and Their Potential Relation to Large Earthquakes

Stephen Holtkamp博士被授予NSF地球科学博士后奖学金，在费尔班克斯的阿拉斯加大学实施一项研究和教育计划。这个项目的目的是提高我们对沿阿拉斯加巨型逆冲俯冲带的地震周期沿着的理解。虽然俯冲带的主要危害来自大地震（产生极端的地面震动和海啸）和火山，但还有各种其他地球物理现象对这些主要地质灾害的影响目前尚未解决。Holtkamp博士将使用一种新开发的地震方法，多站波形互相关，来研究低频地震（LFE）和地震群，这两者都被假设与地震（“慢”）滑动有关。这种技术已经被证明可以检测到比传统地震技术小一个数量级的地震，使我们能够建立一个更完整的地震信号目录。该技术对各种形式的地震背景噪声不敏感，使其成为建立触发现象的完整时程的理想技术。 这些地震信号的更高分辨率表征将使我们能够确定它们在地震周期中的作用以及它们与大地震和火山爆发的关系。这种技术非常适合解决地球科学界的各种问题，从火山地震学到能源技术引起的地震活动（例如，废水注入诱发的地震）。这个项目的一个目标是为来自广泛背景和兴趣的学生和科学家创建一个完整的教程，以快速有效地开始使用这个强大的工具。这最终将通过本科研究人员的指导和课程实施来实现，以提供一种结构化的方式来改进教程，同时也促进跨学科的合作和洞察力。

Dr. Stephen Holtkamp has been awarded an NSF Earth Sciences Postdoctoral Fellowship to implement a research and education program at the University of Alaska, Fairbanks. This project aims to improve our understanding of the seismic cycle along the Alaskan megathrust subduction zone. While the main hazard from subduction zones comes from large earthquakes (generating extreme ground shaking and tsunamis) and volcanoes, there are a variety of other geophysical phenomena that have a currently unresolved impact on these major geologic hazards. Dr. Holtkamp will be using a newly developed seismic method, multiple station waveform cross correlation, to study Low Frequency Earthquakes (LFE's) and earthquake swarms, both of which are hypothesized to be related to aseismic ("slow") slip. This technique has been shown to detect earthquakes up to one order of magnitude smaller than would be possible using traditional seismic techniques, allowing us to build a more complete catalog of these seismic signals. This technique is insensitive to various forms of seismic background noise, making it the ideal technique to build complete time histories of triggered phenomena. The higher resolution characterization of these seismic signals will provide us the ability to determine their role in the seismic cycle and their relation to large earthquakes and volcanic eruptions.This technique is well suited for addressing a variety of problems in the earth science community, from volcano seismology to induced seismicity from energy technologies (e.g., wastewater injection induced seismicity). One goal of this project is to create a complete tutorial for students and scientists from a broad range of backgrounds and interests to quickly and efficiently begin utilizing this powerful tool. This will ultimately be accomplished through mentoring of undergraduate researchers and implementation in coursework to provide a structured way to improve the tutorial while also fostering cross-disciplinary collaboration and insight.