Acceleration of Late Pleistocene activity of a Central European fault driven by ice loading

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F22%3A00559743" target="_blank" >RIV/67985891:_____/22:00559743 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/22:00129110

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0012821X22002321" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0012821X22002321</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.epsl.2022.117596" target="_blank" >10.1016/j.epsl.2022.117596</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Acceleration of Late Pleistocene activity of a Central European fault driven by ice loading

Popis výsledku v původním jazyce

We studied the southern part of the NW-SE trending Sudetic Marginal fault (SMF), situated at the northeastern limit of the Bohemian Massif in central Europe, to assess its Quaternary activity. Eighteen trenches and thirty-four electric resistivity profiles were performed at Bila Voda to study the fault zone and 3-dimensional distribution of a beheaded alluvial fan on the NE side of the fault. We interpret a small drainage, located about 29-45 m to the SE of the fan apex, as the only plausible source channel implying a similar amount of left-lateral offset. The alluvial fan deposits' radiometric ages range between about 24 and 63 ka, but postglacial deposits younger than 11 ka are not displaced, indicating that all motion occurred in the late Pleistocene. The site lies similar to 150 km south of the late Pleistocene Weichselian maximum (similar to 20 ka) ice sheet front. We model the effects of the ice load on lithospheric flexure and resolved fault stresses, and show that slip on the SMF was promoted by the presence of the ice sheet, resulting in a late Pleistocene slip rate of similar to 1.1(+2.3)/(-0.6) mm/yr. As the most favorable time for glacial loading-induced slip would be during the glacial maximum between about 24 and 12 ka, it is doubtful that the slip rate remained constant during the entire period of activity, and if most slip occurred during this period, the short-term rate may have been even higher. Considering that the modern maximum principal stress (sigma(1)) is oriented nearly parallel to the Sudetic Marginal fault (NNW-SSE) and is thus unfavorable for fault motion, our observations suggest that the likelihood of continued motion and earthquake production is much lower in the absence of an ice sheet.

Název v anglickém jazyce

Acceleration of Late Pleistocene activity of a Central European fault driven by ice loading

Popis výsledku anglicky

We studied the southern part of the NW-SE trending Sudetic Marginal fault (SMF), situated at the northeastern limit of the Bohemian Massif in central Europe, to assess its Quaternary activity. Eighteen trenches and thirty-four electric resistivity profiles were performed at Bila Voda to study the fault zone and 3-dimensional distribution of a beheaded alluvial fan on the NE side of the fault. We interpret a small drainage, located about 29-45 m to the SE of the fan apex, as the only plausible source channel implying a similar amount of left-lateral offset. The alluvial fan deposits' radiometric ages range between about 24 and 63 ka, but postglacial deposits younger than 11 ka are not displaced, indicating that all motion occurred in the late Pleistocene. The site lies similar to 150 km south of the late Pleistocene Weichselian maximum (similar to 20 ka) ice sheet front. We model the effects of the ice load on lithospheric flexure and resolved fault stresses, and show that slip on the SMF was promoted by the presence of the ice sheet, resulting in a late Pleistocene slip rate of similar to 1.1(+2.3)/(-0.6) mm/yr. As the most favorable time for glacial loading-induced slip would be during the glacial maximum between about 24 and 12 ka, it is doubtful that the slip rate remained constant during the entire period of activity, and if most slip occurred during this period, the short-term rate may have been even higher. Considering that the modern maximum principal stress (sigma(1)) is oriented nearly parallel to the Sudetic Marginal fault (NNW-SSE) and is thus unfavorable for fault motion, our observations suggest that the likelihood of continued motion and earthquake production is much lower in the absence of an ice sheet.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Earth and Planetary Science Letters

ISSN

0012-821X

e-ISSN

1385-013X

Svazek periodika

591

Číslo periodika v rámci svazku

AUG 1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

117596

Kód UT WoS článku

000812307000004

EID výsledku v databázi Scopus

2-s2.0-85130610322