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A. Mouvement complexe et polyphasé remobilisant d'anciens dépôts de gravité dans la région de San Agustin Chagchaltzin. B. Blocs de rhyolites et de lutites de taille diverse à l'origine du glissement rotationnel d'octobre 2005. Les dépôts de glissements anciens sont des terrains potentiellement instables et hétérogènes, qui favorisent de nouveaux mouvements de masse souvent complexes, comme celui qui s'est produit en 2005 au NE du village de San Agustin Chagchaltzin. Issu du haut du versant, l'éboulement des blocs rhyolitiques a été relayé à mi pente par une avalanche rocheuse remobilisant des matériaux de la formation Huayacocotla et ceux d'un ancien glissement (fig. 5A). Ces matériaux sont restés en place jusqu'en octobre 2005 (fig. 5B), lorsque les pluies torrentielles ont brutalement réactivé le glissement.
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The Sierra Norte de Puebla (Eastern coast of Mexico) is a tropical mountain frequently affected by torrential rains induced by depressions and hurricanes. In October 1999 and 2005, intense precipitation triggered hundreds of landslides on a 134 km area, and caused heavy human losses and material damages. We show that there is a clear relationship b...
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Citations
... This situation was significantly worsened by the heavy rainfall event on April 6, 2022, identified as a major trigger for the subsequent landslide. Several authors (Kim et al. 2004;Xue et al. 2008;Fort, 2011), have underscored the substantial rainfall as a critical triggering factor. ...
This article delves into the vital issue of geotechnical stability in road embankments, a crucial element for the integrity of road infrastructures and the safety of its users. It focuses on a specific case of landslide along the Taza-Al-Hoceima highway at kilometer point 67+800. This case is particularly significant due to the embankment's composition, which predominantly consists of schistose cut and fill, in addition to the topographic and hydrographic complexity of the area. The main ambition of this study is to delineate the various factors and underlying mechanisms that precipitate such geotechnical instabilities. To this end, the research integrates field investigations with laboratory analyses. A major aspect of this research involves examining the characteristics of the schists at the site. These schists are identified as fragmentable clayey rocks (R34), demonstrating a range of Micro-Deval (MDE) coefficients between 67 to 100 and Los Angeles (LA) coefficients from 33 to 57. Upon alteration, these schists are reclassified as fine soils (A2), consisting of 35-40% fine particulate matter, with plasticity indices ranging from 13 to 22 and a high permeability rate (Kp=10-3 m/s). The study underscores the schists' vulnerability, particularly their susceptibility to evolutionary changes and water sensitivity. It also reveals that local geomorphological and hydrodynamic conditions exacerbate water infiltration. Heavy rainfall is pinpointed as the trigger for the landslide incident. Although the current road drainage system effectively manages surface water, the findings of the analysis emphasize the critical need to enhance this system to address the significant water infiltration problem identified.
... The town was devastated by a huge muddy debris flow causing considerable loss and damage (33 fatalities, 61 disappearances, 5,000 people moved from their homes and 40 % of the urban structures destroyed or damaged). The behaviour of soil saturation has been shaped by the pluviometry, especially with four consecutive rainy days are observed (Parrot and Ochoa-Tejeda 2009;Ochoa-Tejeda and Fort 2011), Landsliding is not limited to the spread of the rock mass on the slopes, but may also affect the valley bottoms. For instance, landslides can cause partial or total obstruction of the thalwegs leading to inflection of the river path or upstream flooding. ...
In tropical mountainous regions, heavy rainfalls often induce landslides and mudflows.
Mexico is continually subjected to natural hazards. In February 2010 the town of
Angangueo in the state of Michoacan was devastated by a huge muddy debris flow. Use
of morphological and climatic parameters of the affected areas can be incorporated into a
model that simulates the extension of this natural disaster. It appears that zones whose slope
aspect is against the flow direction represent the most vulnerable zones. The model
described herein can easily and rapidly be applied to any other tropical region to reliably
prevent such catastrophic phenomena. Because in many areas the colluvial slope deposits
register multiple cracks and active scars, an assessment of the risk related to slope
movements in Mexico is essential.
... The town was devastated by a huge muddy debris flow causing considerable loss and damage (33 fatalities, 61 disappearances, 5,000 people moved from their homes and 40 % of the urban structures destroyed or damaged). The behaviour of soil saturation has been shaped by the pluviometry, especially with four consecutive rainy days are observed (Parrot and Ochoa-Tejeda 2009;Ochoa-Tejeda and Fort 2011), Landsliding is not limited to the spread of the rock mass on the slopes, but may also affect the valley bottoms. For instance, landslides can cause partial or total obstruction of the thalwegs leading to inflection of the river path or upstream flooding. ...
In tropical mountainous regions, heavy rainfalls often induce landslides and mudflows. Mexico is continually subjected to natural hazards. In February 2010 the town of Angangueo in the state of Michoacan was devastated by a huge muddy debris flow. Use of morphological and climatic parameters of the affected areas can be incorporated into a model that simulates the extension of this natural disaster. It appears that zones whose slope aspect is against the flow direction represent the most vulnerable zones. The model described herein can easily and rapidly be applied to any other tropical region to reliably prevent such catastrophic phenomena. Because in many areas the colluvial slope deposits register multiple cracks and active scars, an assessment of the risk related to slope movements in Mexico is essential. Keywords Mudflow Modeling and simulation Angangueo Michoacán state (Mexico)
The Sierra Norte de Puebla (Mexico) is a tropical mountain frequently affected by torrential
rains induced by depressions and hurricanes. In October 1999 and 2005, intense precipitation
triggered hundreds of landslides and caused heavy human losses and material damages.
All the landslides surveyed in the field and their traces extracted from the satellite images
have been analyzed by using morphometric parameters in order to characterize and to
classify them. The spatial distribution of observed landslides types is not random but
responds to both regional structural features and material nature involved in the movement.
It is particularly important to establish these close relationships in order to assess landslide
hazards by using different factors and methods and the approach proposed in this paper
seems to be very useful to do that
The Sierra Norte de Puebla (Mexico) is a tropical mountain frequently affected by torrential rains induced by depressions and hurricanes. In October 1999 and 2005, intense precipitation triggered hundreds of landslides and caused heavy human losses and material damages. All the landslides surveyed in the field and their traces extracted from the satellite images have been analyzed by using morphometric parameters in order to characterize and to classify them. The spatial distribution of observed landslides types is not random but responds to both regional structural features and material nature involved in the movement. It is particularly important to establish these close relationships in order to assess landslide hazards by using different factors and methods and the approach proposed in this paper seems to be very useful to do that.
