2024-03-28T23:50:35Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1242262021-06-14T09:24:12Zcom_10261_39226com_10261_8col_10261_42742
2015-11-02T08:00:56Z
urn:hdl:10261/124226
Structure of Alluvial Valleys from 3-D Gravity Inversion: The Low Andarax Valley (Almería, Spain) Test Case
Camacho, Antonio G.
Carmona, Enrique
García-Jerez, Antonio
Sánchez-Martos, Francisco
Prieto, Juan Francisco
Fernández Torres, José
Luzón, Francisco
Ministerio de Economía y Competitividad (España)
Junta de Andalucía
Gravity inversion
3D density models
This paper presents a gravimetric study (based on 382 gravimetric stations in an area about 32 km2) of a nearly flat basin: the Low Andarax valley. This alluvial basin, close to its river mouth, is located in the extreme south of the province of Almería and coincides with one of the existing depressions in the Betic Cordillera. The paper presents new methodological work to adapt a published inversion approach (GROWTH method) to the case of an alluvial valley (sedimentary stratification, with density increase downward). The adjusted 3D density model reveals several features in the topography of the discontinuity layers between the calcareous basement (2,700 kg/m3) and two sedimentary layers (2,400 and 2,250 kg/m3). We interpret several low density alignments as corresponding to SE faults striking about N140–145°E. Some detected basement elevations (such as the one, previously known by boreholes, in Viator village) are apparently connected with the fault pattern. The outcomes of this work are: (1) new gravimetric data, (2) new methodological options, and (3) the resulting structural conclusions.
2015-11-02T08:00:56Z
2015-11-02T08:00:56Z
2014-08-17
artículo
Pure and Applied Geophysics, 172 (11): 3107-3121 (2015)
0033-4553
http://hdl.handle.net/10261/124226
10.1007/s00024-014-0914-8
1420-9136
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100011011
eng
Postprint
http://dx.oi.org/10.1007/s00024-014-0914-8
Sí
MINECO/CGL2010-16250
openAccess
Springer