Investigation of a Tertiary maar structure using three-dimensional resistivity imaging

Brunner, Ingolf; Friedel, S.; Jacobs, Franz; Danckwardt, E.

doi:10.1046/j.1365-246x.1999.00770.x

Cited by 43 publications

(24 citation statements)

References 23 publications

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“…Additionally, resistivity measurements were made in the Baruth area along the seismic lines using Schlumberger half arrays with a maximum spacing of 3,000 m. The interpretation of the sounding curves leads to a 2-D model of the maar (Rodemann and Worzyk 2000). As expected, the results of 3-D resistivity imaging confirm the structure of the maar (Brunner et al 1999) without yielding a more detailed image of the internal maar structure.…”

Section: Seismic Reflection Datasupporting

confidence: 79%

Detailed investigation of preserved maar structures by combined geophysical surveys

et al. 2005

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The detection of completely preserved maar structures is important not only for underground mapping but also for paleoclimate research because laminated maar lake sediments may contain a very detailed archive of climate history. Objective evidence for the existence of such structures can only be provided by geophysics and boreholes. The combination of gravity and magnetic ground surveys appears to be an excellent tool to detect and identify buried maar structures. Their prominent properties are an almost circular gravity minimum corresponding to a crater filled with limnic sediments of low density, and a magnetic anomaly caused by a pyroclastic or basaltic body in the diatreme which indicates the volcanic character. Seismic measurements provide the most detailed information about the internal structure of the maar sediments. Zones of low seismic reflectivity and very low density represent sediments of the late maar-lake period. The early lake period is indicated by debris flow deposits and turbidites represented by seismic reflectors. The seismic sections clearly reveal the bowl-like structure of the maar. Outside this bowl-like structure, there are only a few reflections, which represent the basement. Taking into account the shape of the gravity anomaly, seismic information allows geometrical modelling of the maar structure. Optimal drilling sites can be selected based on the results of geophysical surveying. Comparing the results of combined geophysical surveys above two maar structures of different ages yields a marked similarity in their geophysical pattern.

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Section: Seismic Reflection Datasupporting

confidence: 79%

Detailed investigation of preserved maar structures by combined geophysical surveys

et al. 2005

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“…Schlumberger or Wenner array (Lane et al, 1995). To avoid preferential directions in data recording that would be introduced by the linear electrode layout, Brunner et al (1999) measured electrical resistivity by theway of a pole-pole electrode array arranged in concentric circles at the surface. Panissod et al (1997b) underlined the need for research into new array geometries describing better the heterogeneities in order to optimize the apparent resistivity image before data interpretation.…”

Section: Three-dimensional Surveymentioning

confidence: 99%

Electrical resistivity survey in soil science: a review

Samouëlian

Cousin

Tabbagh³

et al. 2005

Soil and Tillage Research

905

528

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Electrical resistivity of the soil can be considered as a proxy for the spatial and temporal variability of many other soil physical properties (i.e. structure, water content, or fluid composition). Because the method is non-destructive and very sensitive, it offers a very attractive tool for describing the subsurface properties without digging. It has been already applied in various contexts like : groundwater exploration, landfill and solute transfer delineation, agronomical management by identifying areas of excessive compaction or soil horizon thickness and bedrock depth, and at least assessing the soil hydrological properties. The surveys, depending on the areas heterogeneities can be performed in one-, two-or three-dimensions and also at different scales resolution from the centimetric scale to the regional scale. In this review, based on many electrical resistivity surveys, we expose the theory and the basic principles of the method, we overview the variation of electrical resistivity as a function of soil properties, we listed the main electrical device to performed one-, two-or three-dimensional surveys, and explain the basic principles of the data interpretation. At least, we discuss the main advantages and limits of the method.

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“…Its phreatomagmatic origin was supposed by Suhr and Goth (1996) based on a prominent negative gravity anomaly. A seismic survey, complemented by a drilling program and an electrical-resistivity survey, revealed a 1 km wide Oligocene maar structure correlated to the Paleogene volcanism in the Eger rift valley (Brunner et al, 1999;Goth and Suhr, 2000;Goth et al, 2003;Wiederhold, 2003).…”

Section: Discussionmentioning

confidence: 99%

Deciphering lake and maar geometries from seismic refraction and reflection surveys in Laguna Potrok Aike (southern Patagonia, Argentina)

Gebhardt

Batist

Niessen

et al. 2011

Journal of Volcanology and Geothermal Research

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Keywords:explosive volcanism maars sedimentary basin processes South America PASADO project Laguna Potrok Aike is a bowl-shaped maar lake in southern Patagonia, Argentina, with a present mean diameter of~3.5 km and a maximum water depth of~100 m. Seismic surveys were carried out between 2003 and 2005 in order to get a deeper knowledge on the lake sediments and the deeper basin geometries. A raytracing model of the Laguna Potrok Aike basin was calculated based on refraction data while sparker data were additionally used to identify the crater-wall discordance and thus the upper outer shape of the maar structure. The combined data sets show a rather steep funnel-shaped structure embedded in the surrounding Santa Cruz Formation that resembles other well-known maar structures. The infill consists of up to 370 m lacustrine sediments underlain by probably volcanoclastic sediments of unknown thickness. The lacustrine sediments show a subdivision into two sub-units: (a) the upper with seismic velocities between 1500 and 1800 m s . The lake sediments were recently drilled within the PASADO project in the framework of the International Continental Scientific Drilling Program (ICDP). Cores penetrated through lacustrine unconsolidated sediments down to a depth of~100 m below lake floor. This minimal thickness for the unconsolidated and low-velocity lithologies is in good agreement with our raytracing model.

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Investigation of a Tertiary maar structure using three-dimensional resistivity imaging

Cited by 43 publications

References 23 publications

Detailed investigation of preserved maar structures by combined geophysical surveys

Detailed investigation of preserved maar structures by combined geophysical surveys

Electrical resistivity survey in soil science: a review

Deciphering lake and maar geometries from seismic refraction and reflection surveys in Laguna Potrok Aike (southern Patagonia, Argentina)

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