Platanar

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 10.3°N
  • 84.366°W

  • 2267 m
    7436 ft

  • 345034
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: March 1997 (BGVN 22:03)


Dormancy continues but S-flank residents felt six earthquakes on 30 March

On 30 March 1997 residents in the S-flank settlement of San Vicente felt about six earthquakes between 0900 and 2100. One of these earthquakes took place at 1429; it was M 2.7 and its epicenter was 5 km SE of the volcano. No residents in other nearby settlements (Porvenir, Sucre, and Quesada) reported feeling these earthquakes.

About 10 days after the earthquakes, two dry-tiltmeters, measured every 2-3 years, showed differing results. One showed great changes but had been disturbed; the other, which was considered more reliable, had changed little. An April 1980 seismic swarm near Platanar, attributed to a local fault, continued for 2-3 weeks.

Information Contacts: E. Fernández, E. Duarte, V. Barboza, R. Van der Laat, E. Hernandez, M. Martinez, and R. Sáenz, Observatorio Vulcanológico y Sismológico de Costa Rica, Universidad Nacional (OVSICORI-UNA), Apartado 86, 3000 Heredia, Costa Rica.

The Global Volcanism Program has no Weekly Reports available for Platanar.

Index of Bulletin Reports


Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

06/1969 (CSLP 44-69) Increased fumarolic activity and rumblings reported

01/1993 (BGVN 18:01) No significant deformation since 1987

01/1994 (BGVN 19:01) Seven years of dry-tilt measurements show no change

03/1997 (BGVN 22:03) Dormancy continues but S-flank residents felt six earthquakes on 30 March




Bulletin Reports

All information contained in these reports is preliminary and subject to change.


06/1969 (CSLP 44-69) Increased fumarolic activity and rumblings reported

Card 0568 (04 June 1969) Increased fumarolic activity and rumblings reported

The following is from a cable received on 3 June. "New or increased fumarolic activity together with earth rumblings reported by municipal authorities at Cerro Platanar . . . . Although close to Quesada immediate area of volcano extremely inaccessible. Such activity appears to be unusual."

Information Contacts: Richard Berg, American Embassy, San José, Costa Rica

01/1993 (BGVN 18:01) No significant deformation since 1987

Dry-tilt data have shown no significant changes since 1987.

Information Contacts: E. Fernández, J. Barquero, R. Van der Laat, F. de Obadía, T. Marino, and R. Sáenz, OVSICORI; M. Martini, Univ di Firenze, Italy.
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01/1994 (BGVN 19:01) Seven years of dry-tilt measurements show no change

OVSICORI reported in January 1994 that two dry-tilt inclinometers installed in 1987 have thus far showed insignificant changes.

Information Contacts: E. Fernández, J. Barquero, R. Van der Laat, F. de Obaldia, T. Marino, V. Barboza, and R. Sáenz, OVSICORI.
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03/1997 (BGVN 22:03) Dormancy continues but S-flank residents felt six earthquakes on 30 March

On 30 March 1997 residents in the S-flank settlement of San Vicente felt about six earthquakes between 0900 and 2100. One of these earthquakes took place at 1429; it was M 2.7 and its epicenter was 5 km SE of the volcano. No residents in other nearby settlements (Porvenir, Sucre, and Quesada) reported feeling these earthquakes.

About 10 days after the earthquakes, two dry-tiltmeters, measured every 2-3 years, showed differing results. One showed great changes but had been disturbed; the other, which was considered more reliable, had changed little. An April 1980 seismic swarm near Platanar, attributed to a local fault, continued for 2-3 weeks.

Information Contacts: E. Fernández, E. Duarte, V. Barboza, R. Van der Laat, E. Hernandez, M. Martinez, and R. Sáenz, Observatorio Vulcanológico y Sismológico de Costa Rica, Universidad Nacional (OVSICORI-UNA), Apartado 86, 3000 Heredia, Costa Rica.
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The Platanar volcanic center is the NW-most volcano in the Cordillera Central of Costa Rica. The massive complex covers about 900 sq km and is dominated by two largely Pleistocene stratovolcanoes, Platanar and Porvenir. These volcanoes were constructed within the Pleistocene Chocosuela caldera, which may have formed during a major slope failure. The 2183-m-high Cerro Platanar volcano (known locally as Volcán Congo) on the north side of the complex has prehistorical lava flows on its western flanks and is the youngest volcanic center. The highest peak of the complex is 2267-m-high Porvenir volcano, whose summit crater lies 3 km south of Platanar. A thin layer of phreatic ash suggested that an eruption from Platanar occurred within the past few thousand years (Stine and Banks, 1991). The Aguas Zarcas group of nine basaltic cinder cones, located on the north flank of the Platanar-Porvenir complex to as low as 160 m altitude, is in part Holocene in age.

The Global Volcanism Program is not aware of any Holocene eruptions from Platanar. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Platanar page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.


Synonyms

Congo, Volcán

Cones

Feature Name Feature Type Elevation Latitude Longitude
Aguas Zarcas Pyroclastic cone
Azufrado Stratovolcano 2242 m 10° 14' 35" N 84° 20' 56" W
Barrantes, Loma Pyroclastic cone 290 m 10° 26' 9" N 84° 18' 27" W
Buenos Aires Pyroclastic cone 461 m 10° 22' 48" N 84° 18' 18" W
Chiles, Los Pyroclastic cone 250 m 10° 27' 33" N 84° 20' 31" W
Hermoso, Valle Pyroclastic cone 215 m 10° 26' 52" N 84° 20' 13" W
Juan Murillo Pyroclastic cone 518 m 10° 23' 3" N 84° 19' 48" W
Morera, Loma Pyroclastic cone 621 m 10° 21' 48" N 84° 19' 27" W
Palmira, Cerros Stratovolcano 2184 m 10° 11' 24" N 84° 21' 7" W
Pelón, Cerro Stratovolcano 2320 m 10° 14' 54" N 84° 21' 27" W
Pital, Loma Pyroclastic cone 160 m
Porvenir, Cerro Stratovolcano 2267 m 10° 16' 15" N 84° 21' 46" W
Quesada Cone 820 m 10° 18' 32" N 84° 27' 7" W
Siete, Cerro el Stratovolcano 2260 m 10° 14' 42" N 84° 21' 54" W
Vuelta Kopper Pyroclastic cone 290 m 10° 26' 6" N 84° 20' 6" W

Craters

Feature Name Feature Type Elevation Latitude Longitude
Chocosuela Pleistocene caldera
The Platanar volcanic complex on the horizon is the NW-most volcano in the Cordillera Central of Costa Rica. The massive complex consists of two largely Pleistocene stratovolcanoes, Platanar and Porvenir, which grew within the Chocosuela caldera. The highest peak of the complex is 2267-m-high Porvenir volcano, whose summit crater contains a small cone. This view is from the east with the Bosque Alegre (Laguna Hule) maar, located on the lower northern flank of Poás volcano, in the foreground.

Photo by Mike Carr, 1983 (Rutgers University).
Platanar volcano, located NW of the more well-known Poás volcano, is part of the Juan Castro Blanco National Park. Volcán Platanar and Volcán Porvenir were constructed along a N-S line in the western part of the park within Chocosuela caldera, which formed as a result of major explosive eruptions during the late Pleistocene.

Photo by Guillermo Alvarado (Instituto Costarricense de Electricidad).
The Aguas Zarcas group of nine basaltic cinder cones, located on the far northern flank of the Platanar-Porvenir complex to as low as 160 m altitude, is in part Holocene in age. These cones lie 10-17 km behind the volcanic front of Costa Rica at a point 125 km above the Wadati-Benioff zone. The pyroclastic cones were constructed along two parallel fractures striking NNW.

Photo by Paul Kimberly, 1998 (Smithsonian Institution).
The summit crater of 2183-m-high Platanar volcano lies in the shadow at the upper right in this aerial view from the south. Prehistorical lava flows are found on the western flank of Platanar. The forested slopes of Platanar and Porvenir volcano to the south are habitat to abundant wildlife, including jaguars, foxes, pacas, and red- and white-faced monkeys, as well as exotic bird species and tropical snakes. Tropical trees abound, including the cabbage palm, from which a local delicacy, the heart of palm, is extracted.

Photo by Federico Chavarria Kopper, 2004.
Volcán Platanar rises above farmlands north of the volcano. The summit of Platanar, which is also known as Cerro Congo, after the howler monkeys occupying its slopes, reaches 2183 m. This stratovolcano lies about 8 km SE of the city of Quesada at the northern end of the Palmira-Chocosuela-Platanar volcanic complex. Young lava flows are located in the Finca Pradera area on its western flank.

Photo by Eliecer Duarte (OVSICORI-UNA).
The Viejo-Porvenir complex is seen here rising above farmlands NE of the massif. The 2122-m-high Volcan Viejo is on the left and 2267-m-high Porvenir on the right. Volcán Viejo is not actually a volcano, but lies along the rim of the Chocosuela caldera and the Río Segundo erosional caldera. El Viejo is noted for an area of sulfur deposits and fumarolic activity that was prominent until about 1960, after which it decreased and stopped by 1975. Porvenir is a small stratovolcano with a summit crater containing a pyroclastic cone.

Photo by Eliecer Duarte (OVSICORI-UNA).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Alvarado G E, 1989. Los Volcanes de Costa Rica. San Jose, Costa Rica: Universidad Estatal a Distancia, 175 p.

Alvarado G E, 2000. Volcanes de Costa Rica: su geologia, historia y riqueza natural. San Jose, Costa Rica: EUNED, 269 p.

Alvarado G E, Carr M J, 1993. The Platanar-Aguas Zarcas volcanic centers, Costa Rica: spatial-temporal association of Quaternary calc-alkaline and alkaline volcanism. Bull Volc, 55: 443-453.

Alvarado G E, Vega E, Chaves J, Vasquez M, 2004. Los grandes deslizamientos (volcanicos y no volcanicos) de tip debris avalanche en Costa Rica. Rev Geol Amer Central, 30: 83-99.

Alvarado-Induni G E, 2005. Costa Rica, Land of Volcanoes. San Jose, Costa Rica: EUNID, 306 p.

Barquero-H J, Saenz-R R, 1987. Aparatos volcanicos de Costa Rica. Heredia, Costa Rica: OVSICORI-UNA, 1:750,000 map and volcano list.

Carr M J, 1984. Symmetrical and segmented variation of physical and geochemical characterisitics of the Central American volcanic front. J Volc Geotherm Res, 20: 231-252.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Smithsonian Institution-CSLP, 1968-75. [Event notification cards]. Center for Short-Lived Phenomena (CSLP) Event Cards.

Stine C M, Banks N G, 1991. Costa Rica volcano profile. U S Geol Surv Open-File Rpt, 67 p.

Volcano Types

Stratovolcano(es)
Caldera
Pyroclastic cone(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Basalt / Picro-Basalt
Dacite
Rhyolite
Minor
Trachyandesite / Basaltic trachy-andesite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
620
40,382
339,271
3,381,523

Affiliated Databases

Large Eruptions of Platanar Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.