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; 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.

液体在任何类型的地震（诱导，构造，深，浅，大，小）的破裂和/或起始过程中的重要作用是无可争议的。然而，流体和相关参数会影响应力状态以及特定区域的地震性的特定机制尚不清楚。人们认为流体起着板内地震群的主要作用，与构造活性区相比，变形率很小。在这里，我们建议对不良雷申豪尔（Reichenhall）群体中的地震（例如地下水位）和大气相似的参数（例如地下水位）和大气可观察到（例如降雨，大气压）进行广泛研究。除了1995年记录了数百次小地震的数据集外，2000年研究区安装了一个永久的地震网络，还允许收集几只地震群的数据，其中最后一次是在2002年8月的大降雨后不久（在德国造成了灾难性的洪水），其中有超过500个地震事件。这项研究的目的是尝试（定量）答案（以及）降雨，融雪，地下水水平，压力（梯度），过度压力是否与空间和时间上观察到的地震性模式有因果关系。拟议的研究区域的主要好处是（1）地震发生的限制量； （2）经常发生地震群； （3）巴伐利亚州独立支持的研究区域中永久监测的现代近现代时间网络。