Hazard assessment on secondary mountain-hazards triggered by the Wenchuan earthquake

Han, Yingjie; Liu, Hongjiang; Cui, Peng; Su, Fenghuan; Du, Dongsheng

doi:10.1117/1.3154419

Cited by 11 publications

(1 citation statement)

References 1 publication

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“…Combined with the sensitive range of WEDF in partial dependence, this effect is more significant within 10 km of faults, which limits the extension range of geohazard susceptibility along the main faults to a certain extent. In different periods, the Wenchuan earthquake eruption brought about short-term tectonic activity differences between the main faults [ 112 ], and the activation of the other faults by a seismogenic fault during energy transfer caused the difference in tectonic activity between different faults to decrease gradually [ 113 ]. The impact of precipitation rose after 2008 and further strengthened in 2013, and thus the impact of faults has experienced a process of rising, falling, and rising again in the periods after 2008.…”

Section: Discussionmentioning

confidence: 99%

Susceptibility Analysis of Geohazards in the Longmen Mountain Region after the Wenchuan Earthquake

Zhao

et al. 2022

IJERPH

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Multitemporal geohazard susceptibility analysis can not only provide reliable results but can also help identify the differences in the mechanisms of different elements under different temporal and spatial backgrounds, so as to better accurately prevent and control geohazards. Here, we studied the 12 counties (cities) that were severely affected by the Wenchuan earthquake of 12 May 2008. Our study was divided into four time periods: 2008, 2009–2012, 2013, and 2014–2017. Common geohazards in the study area, such as landslides, collapses and debris flows, were taken into account. We constructed a geohazard susceptibility index evaluation system that included topography, geology, land cover, meteorology, hydrology, and human activities. Then we used a random forest model to study the changes in geohazard susceptibility during the Wenchuan earthquake, the following ten years, and its driving mechanisms. We had four main findings. (1) The susceptibility of geohazards from 2008 to 2017 gradually increased and their spatial distribution was significantly correlated with the main faults and rivers. (2) The Yingxiu-Beichuan Fault, the western section of the Jiangyou-Dujiangyan Fault, and the Minjiang and Fujiang rivers were highly susceptible to geohazards, and changes in geohazard susceptibility mainly occurred along the Pingwu-Qingchuan Fault, the eastern section of the Jiangyou-Dujiangyan Fault, and the riparian areas of the Mianyuan River, Zagunao River, Tongkou River, Baicao River, and other secondary rivers. (3) The relative contribution of topographic factors to geohazards in the four different periods was stable, geological factors slowly decreased, and meteorological and hydrological factors increased. In addition, the impact of land cover in 2008 was more significant than during other periods, and the impact of human activities had an upward trend from 2008 to 2017. (4) Elevation and slope had significant topographical effects, coupled with the geological environmental effects of engineering rock groups and faults, and river-derived effects, which resulted in a spatial aggregation of geohazard susceptibility. We attributed the dynamic changes in the areas that were highly susceptible to geohazards around the faults and rivers to the changes in the intensity of earthquakes and precipitation in different periods.

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Section: Discussionmentioning

confidence: 99%

Susceptibility Analysis of Geohazards in the Longmen Mountain Region after the Wenchuan Earthquake

Zhao

et al. 2022

IJERPH

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Three (nearly) complete inventories of landslides triggered by the May 12, 2008 Wenchuan Mw 7.9 earthquake of China and their spatial distribution statistical analysis

et al. 2013

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Remote sensing contributing to assess earthquake risk: from a literature review towards a roadmap

Geiß

Taubenböck

2012

Nat Hazards

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Remote sensing data and methods are widely deployed in order to contribute to the assessment of numerous components of earthquake risk. While for earthquake hazard related investigations the use of remotely sensed data is an established methodological element with a long research tradition, earthquake vulnerability centered assessments incorporating remote sensing data are increasing primarily in recent years. This goes along with a changing perspective of the scientific community which considers the assessment of vulnerability and its constituent elements as a pivotal part of a comprehensive risk analysis. Thereby, the availability of new sensors systems enables an appreciable share of remote sensing first. In this manner, a survey of the interdisciplinary conceptual literature dealing with the scientific perception of risk, hazard and vulnerability reveals the demand for a comprehensive description of earthquake hazards as well as an assessment of the present and future conditions of the elements exposed. A review of earthquake related remote sensing literature, realized both in a qualitative and quantitative manner, shows the already existing and published manifold capabilities of remote sensing contributing to assess earthquake risk. These include earthquake hazard related analysis such as detection and measurement of lineaments and surface deformations in pre-and post-event applications. Furthermore, pre-event seismic vulnerability centered assessment of the built and natural environment and damage assessments for post-event applications are presented. Based on the review and the discussion of current scientific foci and research projects first steps towards a roadmap for remote sensing is drawn, explicitly taking scientific, technical, multi-and transdisciplinary as well as political perspectives into account, which is intended to open possible future research activities.

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Hazard assessment on secondary mountain-hazards triggered by the Wenchuan earthquake

Cited by 11 publications

References 1 publication

Susceptibility Analysis of Geohazards in the Longmen Mountain Region after the Wenchuan Earthquake

Susceptibility Analysis of Geohazards in the Longmen Mountain Region after the Wenchuan Earthquake

Three (nearly) complete inventories of landslides triggered by the May 12, 2008 Wenchuan Mw 7.9 earthquake of China and their spatial distribution statistical analysis

Remote sensing contributing to assess earthquake risk: from a literature review towards a roadmap

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