Recurrent rock avalanches progressively dismantle a mountain ridge in Beichuan County, Sichuan, most recently in the 2008 Wenchuan earthquake

Wąsowski, J.; McSaveney, Mauri; Pisano, Luca; Gaudio, Vincenzo Del; Li, Y.; Hu, Wei

doi:10.1016/j.geomorph.2020.107492

Cited by 13 publications

(10 citation statements)

References 56 publications

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“…), or may be related to errors in the risk assessment [73]. The results show that the risks posed by landslides in high earthquake intensity areas may be lower than those in low earthquake intensity areas, which may be related to the influence of the regional geological conditions and the errors in the existing earthquake-landslide hazard assessments [41,74]. In view of the uncertainty of regional risk results, factor analysis methods can be further used to explore the sensitivity of risks to topography, environment, and other factors to further clarify the characteristics of disaster chain risks [63,64,75].…”

Section: Reliability Of Population Risk For the Disaster Chainmentioning

confidence: 99%

Risk Assessment of Population Loss Posed by Earthquake-Landslide-Debris Flow Disaster Chain: A Case Study in Wenchuan, China

Han

Yin

Yu-ming

et al. 2021

IJGI

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Earthquakes often cause secondary disasters in mountainous areas, forming the typical earthquake-landslide-debris flow disaster chain for a long time that results in a series of losses. It is important to improve the risk assessment method from the perspective of cascading effect of such a disaster chain, by strengthening quantitative research on hazards of the debris flows which are affected by landslide volume and rainstorm intensity. Taking Wenchuan County as an example, the risk assessment method for population loss of the disaster chain is established and the risks are evaluated in this paper. The results show that the population loss risk is 2.59–2.71 people/km2 under the scenarios of the Wenchuan Ms8.0 earthquake and four rainstorm intensities. The impacts of landslide and debris flow after the earthquake were long-term and profound. A comparison of risks caused by each element of the chain revealed that the risk associated with the earthquake accounted for the highest proportion, and landslide and debris flow accounted for 38.82–37.18% and 3.42–7.50%, respectively. As the earthquake intensity increases, the total risk posed by the disaster chain increases significantly. The risk caused by the earthquake is the highest in high earthquake intensity zones; while in the lower-intensity zones, landslides and debris flows pose relatively high risks. The risk assessment results were verified through comparison with actual data, indicating that the simulation results are quite consistent with the existing disaster information and that the risk assessment method based on the earthquake-landslide-debris flow cascade process is significant for future risk estimation.

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Section: Reliability Of Population Risk For the Disaster Chainmentioning

confidence: 99%

Risk Assessment of Population Loss Posed by Earthquake-Landslide-Debris Flow Disaster Chain: A Case Study in Wenchuan, China

Han

Yin

Yu-ming

et al. 2021

IJGI

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“…The impact of the 2008 earthquake on the local landscape has been discussed in detail by Wasowski et al (2021), who documented the occurrence of 68 landslides in an area of 3 km 2 surrounding the Yangjia gully. The Yangjia gully rock avalanche was the largest among the 2008 co-seismic slope failures occurred in the study area.…”

Section: The Yangjia Gully Rock Avalanchesmentioning

confidence: 99%

“…1). The maximum width and length of the rock avalanche deposit were, respectively, 400 and 880 m, and the overall area amounted to about 170,000 m 2 (Wasowski et al 2021). In situ observations of the exposures along the Yangjia gully indicated that the average thickness of the landslide dam deposit could be around 20-30 m. However, this estimate is uncertain, because the base of the 2008 rock avalanche is only locally exposed at its distal eastern-most portion (Fig.…”

Section: The Yangjia Gully Rock Avalanchesmentioning

confidence: 99%

“…Considering the tectonic activity of the area and the occurrence of large magnitude earthquakes, and hence high rate of geomorphic processes, we suspect that the morphology of the base of the 2008 rock avalanche deposit could locally be complex. Moreover, the 2008 rock avalanche overlaps at least in part the deposit of an older (perhaps pre-historic) rock avalanche (Wasowski et al 2021). The contact of the base of the older rock avalanche with slates that form the local bedrock is only exposed in one isolated outcrop in a small stream channel, near its confluence to the Yangjia gully (Figs.…”

Section: The Yangjia Gully Rock Avalanchesmentioning

confidence: 99%

“…The present work investigates the landslide dam deposit in a gully named Yang Jia Gou (Beichuan County), originated from a rock avalanche triggered by the Wenchuan earthquake. Although the landslide dam has been breached within weeks following the 2008 earthquake, the remaining deposits are marginally stable, and their erosion during monsoon seasons has led to a number of destructive debris flows (Li et al 2021;Wasowski et al 2021).…”

Section: Introductionmentioning

confidence: 99%

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Ambient noise and ERT data provide insights into the structure of co-seismic rock avalanche deposits in Sichuan (China)

Gaudio

Wąsowski

et al. 2021

Bull Eng Geol Environ

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The post-seismic history of the 2008 Mw7.9 Wenchuan earthquake shows that marginally stable deposits of large co-seismic landslide dams can pose persistent debris flow hazards for the downstream areas. Here, we combine analyses of single-station recordings of ambient noise with electrical resistivity tomography (ERT) surveys to explore the potential of drawing information on structure and geometry of the deposit of a large rock avalanche triggered by the Mw 7.9 2008 Wenchuan earthquake, which dammed the Yangjia stream in the Sichuan Province (China). The substantial thickness and heterogeneity of this kind of deposits limit the application of standard geophysical techniques, like active seismic surveys, which require highly energetic sources and long linear geophone arrays to reach adequate investigation depths. Passive single-station methods, relying on ambient noise recordings to determine site resonance properties, controlled by the contrast between soft surface layers and a stiffer substratum, offer the opportunity of investigating subsoil properties down to larger depths. In particular, we use a recently developed technique, which isolates the contribution of Rayleigh waves to ambient noise and draws information on sub-soil properties from the inversion of Rayleigh wave ellipticity curves plotted as function of frequency. In this framework, the ERT data can support the ellipticity curve inversion, typically affected by highly non-univocal solutions, by providing constraints for defining of the thickness of the uppermost surficial layers. The results allowed inferring the overlap of different layers within the 2008 rock avalanche deposit, as well as estimating lateral variations in their thickness and S-wave (Vs) velocities.

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Simulation study of rockfall deposition based on UAV-PCAS-PFC: a case study on the rockfall deposition of Xiaomaopo in Kaiyang County

Yang

Qin

et al. 2022

Arab J Geosci

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Recurrent rock avalanches progressively dismantle a mountain ridge in Beichuan County, Sichuan, most recently in the 2008 Wenchuan earthquake

Cited by 13 publications

References 56 publications

Risk Assessment of Population Loss Posed by Earthquake-Landslide-Debris Flow Disaster Chain: A Case Study in Wenchuan, China

Risk Assessment of Population Loss Posed by Earthquake-Landslide-Debris Flow Disaster Chain: A Case Study in Wenchuan, China

Ambient noise and ERT data provide insights into the structure of co-seismic rock avalanche deposits in Sichuan (China)

Simulation study of rockfall deposition based on UAV-PCAS-PFC: a case study on the rockfall deposition of Xiaomaopo in Kaiyang County

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