Map of Quaternary Faults and Folds of Costa Rica

Montero, Walter; Denyer, Percy; Barquero, Rafael; Alvarado, Guillerrmo; Cowan, Hugh

doi:10.3133/ofr98481

Cited by 10 publications

(13 citation statements)

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“…We have also considered active (or potentially active) intraplate faults, represented on Figure 1. The main plate boundaries and faults (Figure 1) were digitized from the map of Case and Holcombe [1980], complemented by new fault maps for Panama [ Cowan , 1998], Costa Rica [ Montero et al , 1998] and Venezuela [ Audemard et al , 2000].…”

Section: Methodology and Inputsmentioning

confidence: 99%

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Evidence for eastward mantle flow beneath the Caribbean plate from neotectonic modeling

Negredo

Jiménez‐Munt

Villaseñor

2004

Geophysical Research Letters

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[1] We have applied a thin-shell modeling technique to study the neotectonics of the Caribbean plate. Kinematic conditions computed assuming rotation poles and velocities from NUVEL-1A and from recent geodetic studies have been applied at the lateral boundaries of the model to represent the motion of the adjacent plates with respect to the Caribbean. We have generated a large number of models varying the values of the fault friction coefficient and shear traction on the base of the plate exerted by mantle flow. The quality of the models has been evaluated by comparing their predictions with data on seismic strain rate, stress direction, geodetic baseline changes, and slip rates. Our results indicate that the only successful models are those with low values of fault friction coefficient and significant basal shear traction exerted by eastward mantle flow beneath the Caribbean.

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Section: Methodology and Inputsmentioning

confidence: 99%

“…The only spreading center in the Caribbean is the Cayman Trough, with a spreading rate of 15 mm/yr [ Rosencrantz et al , 1988]. Values of fault slip rates have been taken from the compilation of Mann and Burke [1984] updated with more recent fault maps in the region [ Cowan , 1998; Montero et al , 1998; Audemard et al , 2000].…”

Section: Model Validationmentioning

confidence: 99%

Evidence for eastward mantle flow beneath the Caribbean plate from neotectonic modeling

Negredo

Jiménez‐Munt

Villaseñor

2004

Geophysical Research Letters

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“…Map taken from OpenStreetMaps (http://www.openstreetmap.org/). b The map shows the distance between the Irazú Volcano crater and the sampling point, in addition to several noncolored rivers flowing into Río Sucio (Montero et al 1998). c, d The river has a particular brownish-yellow color that is clearly seen over a distance of about 30 km.…”

Section: Total Dna Isolation Construction Of 16s Rrna Gene Librariesmentioning

confidence: 99%

“…According to topographic scale maps (1:50,000), the river flows 3 km along the bottom of a landslide produced by the Río Sucio fault, before it meets the first of seven major tributaries that dilute its deep-yellow water ( Fig. 1b; Montero et al 1998). The inaccessible and too dangerous terrain makes the collection of samples in areas nearer the source of the Río Sucio impracticable.…”

Section: Physicochemical Analysis Of Río Sucio Watersmentioning

confidence: 99%

Pristine but metal-rich Río Sucio (Dirty River) is dominated by Gallionella and other iron-sulfur oxidizing microbes

Arce-Rodríguez

Puente-Sánchez

Avendaño³

et al. 2016

Extremophiles

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Whether the extreme conditions of acidity and heavy metal pollution of streams and rivers originating in pyritic formations are caused primarily by mining activities or by natural activities of metal-oxidizing microbes living within the geological formations is a subject of considerable controversy. Most microbiological studies of such waters have so far focused on acid mine drainage sites, which are heavily human-impacted environments, so it has been problematic to eliminate the human factor in the question of the origin of the key metal compounds. We have studied the physico-chemistry and microbiology of the Río Sucio in the Braulio Carrillo National Park of Costa Rica, 22 km from its volcanic rock origin. Neither the remote origin, nor the length of the river to the sampling site, have experienced human activity and are thus pristine. The river water had a characteristic brownish-yellow color due to high iron-dominated minerals, was slightly acidic, and rich in chemolithoautotrophic iron- and sulfur-oxidizing bacteria, dominated by Gallionella spp. Río Sucio is thus a natural acid-rock drainage system whose metal-containing components are derived primarily from microbial activities.

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“…The Nicoya Peninsula and adjacent land to the west of the volcanic range exhibit approximately 11 mm/yr of northwest sliver transport [ Feng et al ., ]. The location is partially constrained by mapped faults (thick black lines) [ Montero et al ., ] and inferred through interseismic GPS data and geomorphic structures (dashed line).…”

Section: Introductionmentioning

confidence: 99%

Structural asperity focusing locking and earthquake slip along the Nicoya megathrust, Costa Rica

Kyriakopoulos

Newman

2016

JGR Solid Earth

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On 5 September 2012, a moment magnitude 7.6 earthquake occurred along the locked megathrust interface directly beneath the Nicoya Peninsula in Costa Rica. The event was anticipated given the history of frequent large earthquakes and recent GPS results. Strain accumulation observed before and coseismic slip observed during the earthquake create a novel and important data set, offering a unique look at the strain and locking behavior around a large megathrust environment. Given this geodetic data, and a newly developed regional 3‐D subduction interface, we develop a regionally appropriate finite element model to evaluate the role of interface topography in generating interseismic locking and ultimately coseismic slip following the 2012 earthquake. We find that the interface is most strongly coupled in a patch immediately beneath the central portion of Nicoya in an area where a topographic high in the downgoing Cocos Plate is resisting further subduction. This zone is the dominant slip environment in the 2012 earthquake. Reevaluation of the interseismic locking over 62 years before the most recent event finds that the total accumulated moment potential (M0 = 3.48 × 1020 N m) well matches the total moment release in the 2012 rupture found here (M0 = 3.73 × 1020 N m, Mw 7.68), with rupture extending to the SE outside of the strongly locked region, possibly as early afterslip. In contrast to a prior study, little locking is required immediately offshore Nicoya—a conclusion important for understanding the rupture area of the 2012 event, regional tsunami potential, and relation with regionally observed shallow slow‐slip events.

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Map of Quaternary Faults and Folds of Costa Rica

Cited by 10 publications

References 0 publications

Evidence for eastward mantle flow beneath the Caribbean plate from neotectonic modeling

Evidence for eastward mantle flow beneath the Caribbean plate from neotectonic modeling

Pristine but metal-rich Río Sucio (Dirty River) is dominated by Gallionella and other iron-sulfur oxidizing microbes

Structural asperity focusing locking and earthquake slip along the Nicoya megathrust, Costa Rica

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