用图神经网络同步检测定位微震,提升地热区监测效率
HEIMDALL: a grapH-based sEIsMic Detector And Locator for microseismicity
- 基于图结构建模地震台站时空关系,端到端完成拾取、关联与定位
- 检测事件数显著高于已有自动系统,识别出2018年4级地震序列
- 适合地热能开发中的实时监测,减少人工干预和模型调参
本文提出一种新型深度学习模型HEIMDALL,用于微震监测,利用地震台站记录间的连续时空关系,构建端到端的地震目录生成流程。该模型结合图论与先进的图神经网络架构,在滑动窗口内同步完成相位拾取、事件关联与定位,适用于回放与近实时监控。在冰岛亨吉尔复杂地热区的开放数据上测试,使用手动修正与自动目录进行训练与验证。结果表明,相比以往自动系统与参考目录,检测事件显著增多,包括2018年12月的4级地震序列和2019年2月单日地震序列。本方法降低误报率,减少人工干预,无需大量流水线调优或深度模型迁移学习。整体验证了其作为地热微震区可靠监测工具的有效性,可补充现有系统,提升地热开发中的风险管控能力。
原文摘要 · Abstract (English)
In this work, we present a new deep-learning model for microseismicity monitoring that utilizes continuous spatiotemporal relationships between seismic station recordings, forming an end-to-end pipeline for seismic catalog creation. It employs graph theory and state-of-the-art graph neural network architectures to perform phase picking, association, and event location simultaneously over rolling windows, making it suitable for both playback and near-real-time monitoring. As part of the global strategy to reduce carbon emissions within the broader context of a green-energy transition, there has been growing interest in exploiting enhanced geothermal systems. Tested in the complex geothermal area of Iceland's Hengill region using open-access data from a temporary experiment, our model was trained and validated using both manually revised and automatic seismic catalogs. Results showed a significant increase in event detection compared to previously published automatic systems and reference catalogs, including a $4 M_w$ seismic sequence in December 2018 and a single-day sequence in February 2019. Our method reduces false events, minimizes manual oversight, and decreases the need for extensive tuning of pipelines or transfer learning of deep-learning models. Overall, it validates a robust monitoring tool for geothermal seismic regions, complementing existing systems and enhancing operational risk mitigation during geothermal energy exploitation.
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