On the trail of fluids in the northernmost intracontinental earthquake swarm areas of the Leipzig-Regensburg fault zone, Germany

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2023-07-06 DOI:10.1007/s10950-023-10146-8
Marcel van Laaten, Ulrich Wegler, Tom Eulenfeld
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Abstract

The Leipzig-Regensburg fault zone is documented as a band of seismic activity extending northwards from the earthquake swarm region NW-Bohemia/Vogtland at the Czech-German border area and is intersected by several Hercynian fault zones. Along the fault zone, there are several earthquake swarm areas, the northernmost of which are Schöneck and Werdau. In this study, we investigate the presumably fluid-induced earthquake swarm activity of the Schöneck and Werdau area. For this purpose, we apply two methods: local earthquake tomography and receiver functions to identify the structural composition of the crust, the areas affected by fluids and the origin of the fluids. We detected potential fluid paths characterised by high Vp/Vs ratios and granite intrusions nearby the swarms characterised by low Vp/Vs anomalies. Receiver function analysis yields the Moho at 25 to 33 km depth and two seismic discontinuities at 55 km and 68 km depth.

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在德国莱比锡-雷根斯堡断裂带最北端大陆内地震群区的流体轨迹上
根据文献记载,莱比锡-雷根斯堡断裂带是一条地震活动带,从捷克-德国边境地区的地震群区西北波西米亚/沃格特兰向北延伸,并与几个海西断裂带相交。沿着断裂带,有几个地震群区,其中最北端是Schöneck和Werdau。在本研究中,我们研究了Schöneck和Werdau地区可能由流体引起的地震群活动。为此,我们采用局部地震层析成像和接收函数两种方法来识别地壳的结构组成、受流体影响的区域和流体的起源。我们发现了以高Vp/Vs比为特征的潜在流体路径,以及在群附近以低Vp/Vs异常为特征的花岗岩侵入物。接收函数分析得到25 ~ 33 km深度的莫霍线和55 km和68 km深度的两个地震不连续面。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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