Juan Grijalva

Juan Grijalva

LCI : MEX1612071200
Main Information
Landslide Name : Juan Grijalva
Latitude : 17:22:12.97 N
Longitude : 93:22:52.77 E
Location
City / District : Ostuacan
Province : Chiapas
Country : Mexico
Reporter
Reporter 1 : VICTOR MANUEL HERNANDEZ-MADRIGAL
Reporter 2 : Juan Carlos Mora-Chaparro
Landslide Type
Material : Rock
Movement : Slide, Complex
Velocity (mm/sec) : Very Rapid
Depth (m) : Deep-Moderate
Slope (degree) : Gentle
Volume (m³) : Very Large
Date of Occurence
Date of Occurence : Nov 04, 2007
Other Information
Land Use Source area : Forest, Pasture
Run-out/deposition area : Forest, Pasture, River
Other Activity : Unknown
Triggering Factor : Human activity and rainfall
Death(s) & Missing : 16
Houses and other structural damage : 12 houses
Photo of landslide : fig5.jpg
Google earth kmz file : Juan Grijalva landslide.kmz
Plan of landslide : Fig4.jpg
Cross section of landslide : Fig2.jpg
Reference (paper/report) : http://rd.springer.com/article/10.1007/s10346-010-0212-1#enumeration
Testing graph : -
Monitoring graph : -
Video of moving landslides including 3D simulation : -
Description :

A large block slide occurred on the south face of the Cerro La Pera, in the locality of Juan Grijalva (JG), municipality of Ostuacan, northwest Chiapas (Mexico). The JG landslide (1.11 km2 / 50 Mm3) created a dam over 80 m high and 1,170 m wide across the Grijalva River (the second largest river in Mexico), backing up the water and forming a 49 km2 lake. Landslide-generated tsunamis up to 15 m high destroyed the village of JG and killed 16 people. The newly formed lake flooded 21 villages located upstream and around 3,600 people to be evacuated with incalculable economic losses. Further, the probable dam-landslide collapse put at risk the Peñitas dam and the city of Villa Hermosa (Tabasco) located downstream 14 km and 120 km, respectively. It was perhaps the most catastrophic landslide in the history of Mexico. The probable trigger of the landslide was cumulative precipitation of about 67% of the average annual rainfall over the preceding 30 days, and a water-level drawdown at the Grijalva River generated by the release of water from the Peñitas dam. After works carried out by the Comisión Federal de Electricidad to join the river and stabilize the slope, the landslide is motionless.