A Constrained 3D Density Model of the Upper Crust from Gravity Data Interpretation for Central Costa Rica

Lücke, Óscar H.; Götze, Hans‐Jürgen; Alvarado, Guillermo E.

doi:10.1155/2010/860902

Cited by 20 publications

(29 citation statements)

References 12 publications

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“…A detailed analysis of a data subset for Costa Rica was carried out by Köther et al (2012). To provide a data set consistent with previous solid Earth modeling (Lücke et al, 2010;Lücke, 2014), in this study, the Bouguer anomaly was calculated from the gravity disturbance. The gravity disturbance is calculated for a given point on the Earth's surface; for the satellite-derived gravity disturbance data used for this study, the downward continuation takes place between the orbit and the surface of the Earth.…”

Section: Gravity Datamentioning

confidence: 99%

“…It also coincides with the location of a feature in the gravity field, which separates this volcanic complex from the three other stratovolcanoes that constitute the Central Cordillera of Costa Rica. This segmentation of the local Bouguer gravity low has been described by Lücke et al (2010) for central Costa Rica, based on a local database compiled from surface gravity measurements. Southwest of this alignment, toward the Talamanca region, the earthquake hypocenters outline a steeply subducting slab with a 50 • angle, to a depth of 70 km.…”

Section: Local Integrated Interpretation Of Slab Geometry For Costa Ricamentioning

confidence: 99%

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Density structure and geometry of the Costa Rican subduction zone from 3-D gravity modeling and local earthquake data

Lücke

Arroyo

2015

Solid Earth

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Abstract. The eastern part of the oceanic Cocos Plate presents a heterogeneous crustal structure due to diverse origins and ages as well as plate-hot spot interactions which originated the Cocos Ridge, a structure that converges with the Caribbean Plate in southeastern Costa Rica. The complex structure of the oceanic plate directly influences the dynamics and geometry of the subduction zone along the Middle American Trench. In this paper an integrated interpretation of the slab geometry in Costa Rica is presented based on 3-D density modeling of combined satellite and surface gravity data, constrained by available geophysical and geological data and seismological information obtained from local networks. The results show the continuation of steep subduction geometry from the Nicaraguan margin into northwestern Costa Rica, followed by a moderate dipping slab under the Central Cordillera toward the end of the Central American Volcanic Arc. Contrary to commonly assumed, to the southeast end of the volcanic arc, our preferred model shows a steep, coherent slab that extends up to the landward projection of the Panama Fracture Zone. Overall, a gradual change in the depth of the intraplate seismicity is observed, reaching 220 km in the northwestern part, and becoming progressively shallower toward the southeast, where it reaches a maximum depth of 75 km. The changes in the terminal depth of the observed seismicity correlate with the increased density in the modeled slab. The absence of intermediate depth (> 75 km) intraplate seismicity in the southeastern section and the higher densities for the subducted slab in this area, support a model in which dehydration reactions in the subducted slab cease at a shallower depth, originating an anhydrous and thus aseismic slab.

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Section: Gravity Datamentioning

confidence: 99%

Section: Local Integrated Interpretation Of Slab Geometry For Costa Ricamentioning

confidence: 99%

Density structure and geometry of the Costa Rican subduction zone from 3-D gravity modeling and local earthquake data

Lücke

Arroyo

2015

Solid Earth

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“…McNutt y Roman, 2015). Lücke et al (2010) sugieren mediante estudios geofísicos que los reservorios magmáticos de los volcanes Turrialba e Irazú no se encuentran directamente bajo los macizos, sino desplazados hacia el suroeste, por lo que se dificulta entablar una correlación directa entre los movimientos magmáticos y la deformación cortical en el sitio de la falla Liebres. Por lo tanto, se necesitan estudios de deformación regional más detallados para explorar una posible correspondencia entre la secuencia sísmica y la actividad volcánica del Turrialba.…”

Section: Discusión Del Origenunclassified

El sismo de Capellades del 2016 y su secuencia sísmica: Manifestación de fallamiento de rumbo en el arco volcánico de Costa Rica

et al. 2018

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“…In order to constrain the geometry and density values of the model, and to restrict the non-uniqueness, other geophysical data are included. A further description of the density model, geometry of boundary surfaces, and geophysical constraints can be found in Lücke (2012), Lücke (2014), Köther et al (2012), and Lücke et al (2010).…”

Section: Modeling Of the Structure Of The Forearc And Subduction Zonementioning

confidence: 99%

Estado de esfuerzos estáticos en la interface de placas Coco-Caribe en Costa Rica: Interpretación mecánica para el origen de asperezas en la zona sismogénica

Lücke¹

2015

Rev. Geol. Amér. Central

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ABSTRACT:The forearc region along the Central American Subduction Zone shows a series of trench-parallel positive gravity anomalies with corresponding gravity lows along the trench and toward the coast. These features extend from Guatemala to northern Nicaragua. However, the Costa Rican section of the forearc does not follow this pattern due to the segmentation of the along-trench gravity low, the absence of the coastal low, and the presence of emerged continental mass along the forearc gravity high at the Nicoya Peninsula. Geodetic and seismological studies along the Costa Rican Subduction Zone suggest the presence of coupled areas in the seismogenic zone beneath the Nicoya Peninsula prior to the 7.6 Mw magnitude earthquake of September 5th, 2012. These areas have previously been associated with asperities. Based on the structure of the overriding plate, former publications have proposed a mechanical model for the origin of asperities along the Chilean convergent margin, in which the dense igneous material in the forearc of the overriding plate above the seismogenic zone modifies/disturbs the state of static stress and influences seismogenic processes. In Costa Rica, surface geology and gravity data indicate the existence of dense basalt/gabbro crust overlying the seismogenic zone where the coupling is present. Bouguer anomaly values in this region reach up to 120×10 -5 m/s 2 and are the highest for Costa Rica. In this research, the state of static stress on the Cocos-Caribbean plate interface is calculated based on the geometry and on the density distribution of a 3D litosphere density model of the subduction zone as interpreted from gravity data from combined geopotential models. Results show a spatial correlation between the coupled areas at the Nicoya Peninsula and the presence of anomalies on the static state of stress on the plate interface. The stress anomalies were calculated for the normal component of the vertical stress on the seismogenic zone and were interpreted as being generated by the dense material which makes up the forearc in the area.

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A Constrained 3D Density Model of the Upper Crust from Gravity Data Interpretation for Central Costa Rica

Cited by 20 publications

References 12 publications

Density structure and geometry of the Costa Rican subduction zone from 3-D gravity modeling and local earthquake data

Density structure and geometry of the Costa Rican subduction zone from 3-D gravity modeling and local earthquake data

El sismo de Capellades del 2016 y su secuencia sísmica: Manifestación de fallamiento de rumbo en el arco volcánico de Costa Rica

Estado de esfuerzos estáticos en la interface de placas Coco-Caribe en Costa Rica: Interpretación mecánica para el origen de asperezas en la zona sismogénica

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