Supplementary Dataset for the Report "The 2024–2025 seismic sequence in the Santorini-Amorgos region: Insights into volcano-tectonic activity through high-resolution seismic monitoring"
收藏资源简介：
Supplementary Dataset for the Fast Report "The 2024–2025 seismic sequence in the Santorini-Amorgos region: Insights into volcano-tectonic activity through high-resolution seismic monitoring" by Ioannis Fountoulakis and Christos P. Evangelidis. The Fast Report can be found in Seismica Vol. 4 No. 1 (2025). DOI: https://doi.org/10.26443/seismica.v2i1.1032 Abstract: The 2024–2025 seismic sequence in the Santorini-Amorgos region demonstrates a complex evolution revealing the interaction between tectonic and volcanic processes. In this study, a detailed seismic catalog is presented, generated for operational monitoring using machine-learning-based phase picking and high-precision relocation methods. By late summer 2024, seismic activity emerged beneath Santorini and within the caldera. By late January 2025 the seismicity appeared at around 20 km beneath the Kolumbo volcano before migrating northeastward and shallower around Anydros island, aligning with southwest-northeast tectonic structures. The relocation process confirmed a diffuse back-and-forth migration along this trend, with some distinct shallow events. Non-double couple moment tensor solutions show predominantly positive isotropic components suggesting crack-opening processes driven by magmatic and fluid involvement. Spectral analysis metrics also support this, highlighting earthquake spatial variations with different frequency content linked to alternative source mechanisms. The results show a complex interaction between tectonic and magmatic processes, potentially indicating the upward migration of magmatic fluids from deep reservoirs or dike injection. Overall, during this intense seismovolcanic activity, we established an operational workflow to provide the authorities with updates on the ongoing evolution of this earthquake sequence. This high quality seismic catalog is now openly available for future studies. Files: catalog.txt: GrowClust relocated earthquake catalog. SSST.txt: Source-specific station term (SSST) relocated catalog. mts.xml: Moment tensors results. FI.txt: Frequency Index results. moviewcc.mp4: Movie with the spatiotemproral evolution of the seismic activity.
伊奥尼斯·丰图拉基斯（Ioannis Fountoulakis）与克里斯托斯·P.埃万吉利迪斯（Christos P. Evangelidis）所著《快速报告：圣托里尼-阿莫戈斯地区2024—2025年地震序列：通过高分辨率地震监测揭示火山构造活动》的补充数据集。 该快速报告发表于《Seismica》2025年第4卷第1期。 DOI：https://doi.org/10.26443/seismica.v2i1.1032 摘要： 圣托里尼-阿莫戈斯地区2024—2025年地震序列呈现出复杂的演化过程，揭示了构造活动与火山活动之间的相互作用。本研究基于机器学习震相拾取与高精度重定位方法生成了一套详细的地震目录，用于业务化监测。2024年夏末，圣托里尼岛下方及破火山口内出现地震活动；2025年1月末，科伦博火山下方约20公里处出现地震活动，随后地震向东北方向迁移，并在安德里罗斯岛附近逐渐变浅，该分布与西南-东北向的构造结构相吻合。重定位结果证实，地震沿该方向呈现弥散式往复迁移，同时存在若干显著的浅源地震事件。非双力偶矩张量解显示，地震以正各向同性分量为主，表明存在由岩浆与流体活动驱动的张裂过程。频谱分析指标也佐证了这一结论，凸显出地震的空间分布差异，不同频率特征对应不同的震源机制。研究结果表明构造与岩浆活动存在复杂的相互作用，这可能意味着岩浆流体从深部储库向上迁移，或是岩脉侵入活动。总体而言，在此次强烈的地震火山活动期间，我们搭建了一套业务化工作流程，可为官方提供该地震序列持续演化的最新动态。本高质量地震目录现已公开获取，可供后续研究使用。 文件列表： catalog.txt：采用GrowClust方法重定位的地震目录 SSST.txt：源专属台站项（Source-specific station term, SSST）重定位目录 mts.xml：矩张量计算结果 FI.txt：频率指数（Frequency Index）计算结果 moviewcc.mp4：展示地震活动时空演化过程的视频
