Seismic investigation of the Fogo magmatic plumbing system, Cape Verde, using multi-array techniques (FoMaPS)

使用多阵列技术 (FoMaPS) 对佛得角福戈岩浆管道系统进行地震调查

• 批准号: 320572620
• 负责人: Dr. Ingo Wölbern
• 金额: --
• 依托单位: Arbeitsgruppe Seismologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/320572620?language=en
• 关键词: Seismic; investigation; Fogo; magmatic; plumbing

Volcanic eruptions are regularly observed on the island of Fogo, Cape Verde, with an average re-occurrence interval of ca. 20 years. However, the structure and extent of the related volcanic plumbing system are not well understood. Previous studies have investigated earthquakes related to magmatic migration processes connected with the Fogo volcano using conventional network configurations. Seismicity has been reported to occur mainly southwest of the island of Brava while a more recent study reports on activity focussed between Brava and Fogo. Multi-array seismology has the potential to significantly reduce the localization errors of seismic events, in particular for those outside a station network, and to lower the detection threshold. This allows to increase the amount of detected events. The subject of this proposal is a study of the local volcano-related seismicity applying multi-array methods which is a unique task amongst the research activities in German universities. The scientific aims are (a) to precisely map local events to constrain the structure of and the dynamic processes within the volcanic plumbing system, (b) to image the magma source region below the Fogo volcano using reflected and backscattered waves, and (c) to localize volcanic tremor events.

佛得角福戈岛上定期观察到火山喷发，平均每隔20年再次喷发一次。然而，相关火山管道系统的结构和范围还没有得到很好的了解。以前的研究使用常规的网络配置调查了与与福戈火山有关的岩浆迁移过程有关的地震。据报道，地震活动主要发生在布拉瓦岛的西南部，而最近的一项研究报告说，地震活动集中在布拉瓦和福戈岛之间。多阵列地震学有可能显著减少地震事件的定位误差，特别是对台网外的地震事件，并降低探测阈值。这允许增加检测到的事件的数量。这项建议的主题是应用多阵列方法研究当地与火山有关的地震活动，这是德国大学研究活动中的一项独特任务。科学目标是：(A)准确绘制当地事件地图，以限制火山管道系统的结构和内部的动态过程；(B)利用反射波和后向散射波对福戈火山下方的岩浆源区进行成像；(C)确定火山震动事件的位置。