The effect of location and geometric properties of landslides caused by rainstorms and earthquakes

Landslides triggered by rainstorms and earthquakes are prominent geological hazards that exhibit distinctive spatial and morphological characteristics due to diverse instability mechanisms. However, studies on differences between the two types of landslides remain limited. In this study, we explored...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Earth surface processes and landforms 2024-06, Vol.49 (7), p.2067-2079
Hauptverfasser: Qiu, Haijun, Su, Lingling, Tang, Bingzhe, Yang, Dongdong, Ullah, Mohib, Zhu, Yaru, Kamp, Ulrich
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Landslides triggered by rainstorms and earthquakes are prominent geological hazards that exhibit distinctive spatial and morphological characteristics due to diverse instability mechanisms. However, studies on differences between the two types of landslides remain limited. In this study, we explored differences in location and geometric properties between rainstorm‐induced landslides in Qinzhou, Longchuan and Fukuoka and earthquake‐induced landslides in Lushan, Iburi and Kaikōura. We normalized the location of landslides across the slope and quantified the landslide polygons using four geometric properties. Findings revealed that both location and geometric properties are specific to landslide type and differ between them. Earthquake‐induced landslides are more common near the ridge of a slope, while rainstorm‐induced landslides are more frequent in the valley or near streams. The quantitative analysis of geometric properties showed that earthquake‐induced landslides are generally larger and have a more compact, rounded and less complex shape. The two landslide types present different hazards, particularly in their runout zones, where dispersion of materials occurs. Insights from our quantitative approach serve as a critical foundation for informed decision‐making in emergency scenarios and contribute to enhancing landslide hazard management. This study found that both location and geometric properties are specific to landslide type and differ between rainstorm‐ and earthquake‐induced landslides. Compared with rainstorm‐induced landslides, earthquake‐induced landslides are more common near the ridge of a slope and have a larger, more compact, rounded and less complex shape.
ISSN:0197-9337
1096-9837
DOI:10.1002/esp.5816