Source area morphometry and high depletion rate of landslides may indicate their coseismic origin

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F24%3A00584930" target="_blank" >RIV/67985891:_____/24:00584930 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/24:00139360 RIV/00025798:_____/24:10169086

Výsledek na webu

<a href="https://doi.org/10.1016/j.enggeo.2024.107424" target="_blank" >https://doi.org/10.1016/j.enggeo.2024.107424</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.enggeo.2024.107424" target="_blank" >10.1016/j.enggeo.2024.107424</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Source area morphometry and high depletion rate of landslides may indicate their coseismic origin

Popis výsledku v původním jazyce

Ancient coseismic landslides indicate prehistoric earthquakes and may also be a measure of their intensity. Their identification in the landscape remains, however, challenging. We used field geologic observations of source areas of recent rainfall-induced and earthquake-induced landslides to define a morphometric index that can distinguish between these two types of triggers. Morphometries of 129 landslides from tropical, subtropical and temperate zones developed in a variety of bedrock types were described by using the following parameters: i) depletion index (Id), i.e. the ratio between the length of the depleted part and the length of the source area, ii) relative slope height (Hrel) and iii) source area angle (S), i.e. the angle between the top of the line connecting the scarp top with the toe of the source area and the horizontal plane. They were obtained using globally available digital elevation models and satellite images. Their combination into an Index of Potential Trigger (IPT) successfully distinguished between the two types of landslide triggers with an overall accuracy of 87%. The rainfall-induced landslides had a significantly lower average IPT value of 0.01 as compared with 0.37 for the coseismic landslides. The index of potential trigger may be a useful and readily implemented morphometric tool for preliminary identification of prehistoric coseismic landslides recorded in the current topography.

Název v anglickém jazyce

Source area morphometry and high depletion rate of landslides may indicate their coseismic origin

Popis výsledku anglicky

Ancient coseismic landslides indicate prehistoric earthquakes and may also be a measure of their intensity. Their identification in the landscape remains, however, challenging. We used field geologic observations of source areas of recent rainfall-induced and earthquake-induced landslides to define a morphometric index that can distinguish between these two types of triggers. Morphometries of 129 landslides from tropical, subtropical and temperate zones developed in a variety of bedrock types were described by using the following parameters: i) depletion index (Id), i.e. the ratio between the length of the depleted part and the length of the source area, ii) relative slope height (Hrel) and iii) source area angle (S), i.e. the angle between the top of the line connecting the scarp top with the toe of the source area and the horizontal plane. They were obtained using globally available digital elevation models and satellite images. Their combination into an Index of Potential Trigger (IPT) successfully distinguished between the two types of landslide triggers with an overall accuracy of 87%. The rainfall-induced landslides had a significantly lower average IPT value of 0.01 as compared with 0.37 for the coseismic landslides. The index of potential trigger may be a useful and readily implemented morphometric tool for preliminary identification of prehistoric coseismic landslides recorded in the current topography.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Engineering Geology

ISSN

0013-7952

e-ISSN

1872-6917

Svazek periodika

330

Číslo periodika v rámci svazku

FEB

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

16

Strana od-do

107424

Kód UT WoS článku

001176854800001

EID výsledku v databázi Scopus

2-s2.0-85183939257