Escazú, Costa Rica

Escazu landslides inventory DEM

The study area is located in the Cerros de Escazú, province of San José, which is a mountain range in central Costa Rica located southwest of the city of San Jose. The climate is predominantly tropical and rainfall occurs mostly from May to November; abrupt changes between sunny and rainy weather are common. It borders the Central Valley to the south, and along with the Cedral massif forms the Fila de la Candelaria, which is considered the northernmost part of the Cordillera de Talamanca.

The area is located 12 km SW of San José, and extends for approximately 277 km2 with elevations from 400 m along the Pacacua River flood plain to 2,428 m (7,966 feet) at Cerro Rabo de Mico.

The orogenic process that formed the mountain range is the same that caused the lifting of the Cordillera de Talamanca. For this reason, the same geological materials (igneous, sedimentary and metamorphic) are present. The surface formations, especially in areas that are subject to large landslides, expose igneous rocks. In the mountains of Escazú, for example, outcrops of magmatic rock types (intrusive) are located in the hills of San Miguel, Pico Alto Blamco and Burío. The lithology of the Cerros de Escazú has aged rocks from the Tertiary to Quaternary. In a sequence from the oldest to the most recent rocks are the following formations: Pacacua Formation (clastic rocks, volcanic, shale and sandstone, altered and fragmented by the presence of intrusive Escazú); Peña Negra Formation (black shales, siltstones, tuffaceous sandstones and conglomerates, also fragmented, interbedded and mixed with each other, making them susceptible to landslides); Intrusive Escazú (pluton in whose composition can be distinguished granodiorites, monzodiorites, monzonites and micro granodiorites) and Quaternary sediments (colluvium, blocks, cones of debris and recent deposition materials transported by rivers or by gravitational processes).

In the case of the Cerros de Escazú, tectonics is complex, since the materials that compose the Cerros have been affected by a process of internal uprising associated with magmatic intrusions. These magmatic intrusions generated a profuse fault system which gives an unstable condition to the hills, visible especially in the surface materials, which are highly fractured. The area has four main faults of considerable length and countless smaller secondary faults. The four major faults form a trapezoid whose center is dominated by the Intrusive Escazú, which may be the evidence of the formation of a granitic body surrounded by sedimentary formations of marine origin. This system of major and minor faults has an active dynamic that is responsible for the many landslides that are located in different parts of the orographic whole.

Land use is chiefly focused on livestock, horticulture, urbanization and the few remaining forest areas. Human intervention on the landscape, as areas of recent deforestation and the opening of roads, often triggered large landslides. Additionally hurricane events and intense seasonal rainfall events trigger floods and landslide events producing human losses and damages to structures and infrastructures. 2nd-8th November 2010 the intense rainfall caused by Thomas Hurricane triggered numerous landslides and flooding resulting in human fatalities (26) and damages to buildings (2450) and infrastructures (roads, transmission towers).

Tested LAMPRE products

1 LIM-Product icon OFF 2 ELIM-Product icon OFF 3 LSMM-Product icon OFF 4 LStats-Product icon OFF 6 LRIM-Product icon OFF

Physiographic settings

Tropical environment

Relevant phenomena

Landslides, debris flow, flooding

Read 1120 times

LAMPRE products

1 LIM-Product icon2 ELIM-Product icon OFF3 LSMM-Product icon OFF4 LStats-Product icon OFF5 3DSDM-Product icon6 LRIM-Product icon OFF7 LEdu Product icon

Latest from LAMPRE

Final Project Review Meeting in Brussels Sunday, 08 February 2015 26th February 2015, Brussels. After 24 months, the LAMPRE project... More detail
Final Dissemination Conference in Brussels Sunday, 08 February 2015 25th of February 2015, Brussels. The International Final Dissemination... More detail
Dissemination and Training workshop in Costa Rica Monday, 29 December 2014 19-22 January 2015, San José. A dissemination and Training... More detail
Copernicus Emergency Projects Workshop at REA in Brussels Thursday, 04 December 2014 4 December 2014, Bruxelles - Representatives of FP7-Space projects... More detail
IntoSpace: brochure on EU space research projects under the FP7 Wednesday, 03 December 2014 The 'Into Space’ brochure has just been published and is... More detail

Dissemination materials

Relevant links

logo

GEO logo

European geological surveys logo

 

Contact us

Fausto Guzzetti 
Consiglio Nazionale delle Ricerche - Istituto di Ricerca per la Protezione Idrogeologica

  • Tel. +39 075 501 4402

FACTS & FIUGRES

GA n°: 312384
Project type: Small collaborative project
Start date: 01/03/2013
Duration: 24 months
Total budget: 2,488 mln. €
EC funding: 1,964 mln. €
Total effort in person-month: 284
Other info: Visit CORDIS

 

EU FP7

The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement nº 312384. LAMPRE is managed by the Research Executive Agency (REA)

LAMPRE is on Twitter

LAMPREproject
LAMPREproject FInal Conference at the Natural Sciences museum in Bruxelles showing LAMPRE products and results #FP7 #Dissemination pic.twitter.com/xddv3voJwW

Wednesday, 25 February 2015 via Twitter Web Client