Geomorphological evidence of tectonic activity of the Marianske Lazne Fault (Czech Republic) and its influence to stream network evolution

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Acta Geodynamica et Geomaterialia Pub Date : 2021-11-25 DOI:10.13168/agg.2021.0039

J. Flašar

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引用次数: 0

Abstract

The Mariánské Lázně Fault (western Bohemia, CZE) is a morphologically, geologically and tectonically prominent structure with that is 150 km long with an NNW-SSE orientation. Its tectonic activity, especially in the NW part and in the neighbouring Cheb basin, is well known and has been proven by present-day earthquake swarms, mantle-derived CO2 emanations, geophysical and paleoseismological research. It seems that other parts of the MLF (especially segments of NNW-SSE and N-S orientation) might also have been active during the Pleistocene, possible even in the Holocene. This study provides a robust set of morphometric analyses – mountain-front sinuosity, basin asymmetry, longitudinal stream profiles, SL-index, which assesses the possibility of recent tectonic activity. The results suggest that the activity of the central and southern part of the MLF could have been very young. A reconstruction of the evolution of the stream network of the Mže River, as a result of different timing of the activity of particular segments of the MLF, is also put forward. The first ideas about the evolution of terrain morphology and the stream network are proposed by this study, however subsequent field research (geophysics, paleoseismology) could prove and date the tectonic activity. The delineation of segments with young activity may also have a great implication for seismic hazard assessment. ARTICLE INFO

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Marianske-Lazne断层构造活动的地貌证据及其对河网演化的影响

MariánskéLáznŞ断层（波希米亚西部，CZE）是一个形态、地质和构造上突出的构造，长150公里，方向为NNW-SSE。它的构造活动，特别是在西北部和邻近的切布盆地，是众所周知的，并已被当今的地震群、地幔衍生的二氧化碳排放、地球物理和古地震学研究所证明。MLF的其他部分（尤其是NNW-SSE和N-S方向的部分）似乎也可能在更新世期间活跃，甚至可能在全新世。本研究提供了一套稳健的形态计量分析——山前弯曲度、盆地不对称性、纵向河流剖面、SL指数，用于评估近期构造活动的可能性。结果表明，MLF中部和南部的活动可能非常年轻。由于MLF特定河段活动的不同时间，还提出了对Mže河河网演变的重建。这项研究提出了关于地形形态和河网演化的第一个想法，但随后的实地研究（地球物理学、古地震学）可以证明和确定构造活动的年代。具有年轻活动的分段的划定也可能对地震危险性评估具有重大意义。文章信息

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Geodynamica et Geomaterialia 地学-地球化学与地球物理

CiteScore

2.30

自引率

0.00%

发文量

期刊介绍： Acta geodynamica et geomaterialia (AGG) has been published by the Institute of Rock Structures and Mechanics, Czech Academy of Sciences since 2004, formerly known as Acta Montana published from the beginning of sixties till 2003. Approximately 40 articles per year in four issues are published, covering observations related to central Europe and new theoretical developments and interpretations in these disciplines. It is possible to publish occasionally research articles from other regions of the world, only if they present substantial advance in methodological or theoretical development with worldwide impact. The Board of Editors is international in representation.