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Landslides

, Volume 9, Issue 2, pp 263–273 | Cite as

On the landslide event in 2010 in the Monarch Butterfly Biosphere Reserve, Angangueo, Michoacán, Mexico

  • Irasema Alcántara-Ayala
  • José López-García
  • Ricardo J. Garnica
Recent Landslides

Abstract

In February 2010, 19 fatalities and economic damage were caused by a regional landslide episode in the state of Michoacán, México. The municipalities of Angangueo, Ocampo, Tiquicheo de Nicolás Romero, Tuxpan, and Tuzantla were severely damaged, with Angangueo being the most affected. The event involved a series of debris flows, of which four were the most significant; these four caused 16 deaths in addition to considerable damage to roads, electricity, and the water supply system, with indirect consequences in crop production, cattle farming, and tourism. The area affected by these four flows was calculated as 282 km2, with an estimated 697,346 m3 of mobilized material. General observations indicated that the initiation sources of the debris flows were on deforested zones. The present research is concentrated on the Angangueo basin, an area situated within the Monarch Butterfly Biosphere Reserve. Given the lack of rain gauges in the area of interest, records from neighboring points were used to build a comprehensive overview of the extreme precipitation event that triggered the devastating debris flows. The nearest rain gauge, Laguna del Fresno, situated 21 km to the south, recorded 204 mm of rainfall from 1 to 5 February, equivalent to 30% of the mean annual rainfall. Moreover, during a 24-h period the El Bosque rain gauge recorded 144.5 mm of precipitation, the equivalent of 2,270% of the mean rainfall for the same month (6.36 mm). The occurrence of a hailstorm preceding the rainfall event is notable; conditions in the superficial soil layer would have included an increased pore water pressure. Presumably, before the 2,000-year return period extreme rainfall event, thawing of hail and consequent moisture and/or pore-pressure increase result in decreased frictional strength. This paper presents a spatial analysis of the distribution of these landslides, mainly debris flows, as well as general observations on the triggering mechanism, the strength properties of the materials involved, and the societal impact.

Keywords

Landsliding Debris flows Rainfall Angangueo Monarch Butterfly Biosphere Reserve 

Notes

Acknowledgments

The authors thank the support kindly provided by UNAM through the research projects IN307410 and IN303010 and are grateful to Hazziel Padilla Doval, Roberto C. Borja-Baeza, and Laura Diana López-Ascencio for their collaboration in the field campaign and the preparation of some figures, respectively. Thanks are also due to the anonymous reviewers, as their suggestions improved the original manuscript.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Irasema Alcántara-Ayala
    • 1
  • José López-García
    • 1
  • Ricardo J. Garnica
    • 1
  1. 1.Instituto de GeografíaUniversidad Nacional Autónoma de MéxicoCoyoacánMexico

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