Mapping soft soils in the Segura river valley (SE Spain): a case study of microtremors as an exploration tool

Delgado, José; Casado, Carlos López; Estévez, Antonio; Giner, J. J.; Cuenca, A.; Molina, Sergio

doi:10.1016/s0926-9851(00)00016-1

Cited by 144 publications

(103 citation statements)

References 6 publications

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“…These materials constitute the geotechnical substratum of the city of Orihuela, being the Pleistocene to Holocene sediments the most compressible ones. The spatial distribution of soft soils in the VBSR increases towards to the centre of the valley reaching a maximum thickness of up to 50 m (Delgado et al, 2000). These data have been digitized and completed with the geotechnical information derived from new boreholes located west of the city of Orihuela and interpolated with the kriging method (Matheron, 1963) to generate the soft soil thickness map (Fig.…”

Section: Description Of the Study Areamentioning

confidence: 99%

Subsidence activity maps derived from DInSAR data: Orihuela case study

Sanabria

Guardiola‐Albert

Tomás

et al. 2014

Nat. Hazards Earth Syst. Sci.

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Abstract.A new methodology is proposed to produce subsidence activity maps based on the geostatistical analysis of persistent scatterer interferometry (PSI) data. PSI displacement measurements are interpolated based on conditional Sequential Gaussian Simulation (SGS) to calculate multiple equiprobable realizations of subsidence. The result from this process is a series of interpolated subsidence values, with an estimation of the spatial variability and a confidence level on the interpolation. These maps complement the PSI displacement map, improving the identification of wide subsiding areas at a regional scale. At a local scale, they can be used to identify buildings susceptible to suffer subsidence related damages. In order to do so, it is necessary to calculate the maximum differential settlement and the maximum angular distortion for each building of the study area. Based on PSIderived parameters those buildings in which the serviceability limit state has been exceeded, and where in situ forensic analysis should be made, can be automatically identified. This methodology has been tested in the city of Orihuela (SE Spain) for the study of historical buildings damaged during the last two decades by subsidence due to aquifer overexploitation. The qualitative evaluation of the results from the methodology carried out in buildings where damages have been reported shows a success rate of 100 %.

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Section: Description Of the Study Areamentioning

confidence: 99%

Subsidence activity maps derived from DInSAR data: Orihuela case study

Sanabria

Guardiola‐Albert

Tomás

et al. 2014

Nat. Hazards Earth Syst. Sci.

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show abstract

“…The Bajo Segura Basin constitutes a Neogene-Quaternary depression developed in the northeast part of the Betic Cordillera (Delgado et al, 2000 and2003). The basin has an elongated morphology in the ENE-WSW direction and it is controlled principally by two faults, the Crevillente fault to the north and the Bajo Segura fault to the south (Alfaro et al, 2002).…”

Section: Data Acquisitionmentioning

confidence: 99%

Optimizing the number of stations in arrays measurements: Experimental outcomes for different array geometries and the f–k method

Rosa-Cintas¹,

Galiana-Merino²,

Alfaro³

et al. 2014

Journal of Applied Geophysics

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“…Recently, several studies [Yamanaka et al, 1994;Ibs-von Seht and Wohlenberg, 1999;Delgado et al, 2000;Parolai et al, 2002] showed that microtremor measurements can be used to map the thickness of sediment. Quantitative relationships between this thickness and the fundamental frequency of the sediment, as determined from the maximum of the H/V spectral ratio of microtremors [Nakamura, 1989], were calculated for both the Segura River valley (Spain) [Delgado et al, 2000], and Lower Rhine Embayment (Germany) [Ibs-von Seht and Wohlenberg, 1999].…”

Section: Sediment Thickness Related With H/v Ratiomentioning

confidence: 99%

“…Quantitative relationships between this thickness and the fundamental frequency of the sediment, as determined from the maximum of the H/V spectral ratio of microtremors [Nakamura, 1989], were calculated for both the Segura River valley (Spain) [Delgado et al, 2000], and Lower Rhine Embayment (Germany) [Ibs-von Seht and Wohlenberg, 1999].…”

Section: Sediment Thickness Related With H/v Ratiomentioning

confidence: 99%