Investigation of fluid-controlled seismicity in a swarmquake area

群震区流体控制地震活动研究

• 批准号: 5409162
• 负责人: Professor Dr. Heiner Igel
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5409162?language=en
• 关键词: Investigation; fluid; controlled; seismicity; swarmquake

The important role of fluids in the rupture and/or initiation process of any kind of earthquakes (induced, tectonic, deep, shallow, large, small) is undisputed. Yet, the particular mechanisms through which fluids and associated parameters influence the stress regime and thus the seismicity of a particular area are not well understood. Fluids are thought to play a dominant role of intraplate earthquake swarms where the deformation rate is small compared to tectonically active regions. Here, we propose to carry out an extensive study of the spatio-temporal behavior of earthquakes, fluid-related parameters (e.g. ground water levels) and atmospheric observables (e.g. rainfall, atmospheric pressure) in the swarmquake area of Bad Reichenhall, in the southeast of Germany. In addition to a data set with several hundred small earthquakes recorded in 1995, a permanent seismic network installed in the study area in the year 2000 allowed the collection of data from several earthquake swarms, the last of which followed shortly after the heavy rainfall in August 2002 (causing the devastating floods in Germany) with more than 500 seismic events. The goal of this study is to attempt to give a (quantitative) answer whether (and how) rainfall, snowmelt, ground-water level, pressure (gradients), overburden pressure, are causally related to the observed seismicity patterns in space and time. The major benefits of the proposed study area are (1) the confined volume in which the earthquakes take place; (2) the frequently occuring earthquake swarms; and (3) a permanently monitoring, modern near-real time network in the study area independently supported by the Bavarian state.

流体在任何类型地震（诱发地震、构造地震、深地震、浅地震、大地震、小地震）的破裂和/或引发过程中的重要作用是无可争议的。然而，流体和相关参数影响应力状态并因此影响特定区域的地震活动的特定机制尚不清楚。流体被认为在板内地震群中发挥着主导作用，与构造活动区域相比，板内地震群的变形率较小。在这里，我们建议对东南部巴特赖兴哈尔群震区的地震时空行为、流体相关参数（例如地下水位）和大气可观测值（例如降雨、大气压力）进行广泛的研究德国的。除了 1995 年记录的数百次小地震的数据集外，2000 年在研究区安装的永久地震台网还可以收集几次地震群的数据，最后一次地震群发生在 8 月的强降雨之后不久。 2002 年（在德国造成毁灭性洪水）发生了 500 多起地震事件。本研究的目的是试图给出（定量）答案，降雨、融雪、地下水位、压力（梯度）、覆盖压力是否（以及如何）与观测到的空间和时间地震活动模式存在因果关系。拟建研究区的主要优点是（1）地震发生的有限体积； （二）频繁发生的震群； (3) 研究区域内由巴伐利亚州独立支持的永久监控、现代近实时网络。