The deep crust beneath the Trans‐European Suture Zone from a multiscale magnetic model

Milano, Maurizio; Fedi, Maurizio; Fairhead, J. D.

doi:10.1002/2016jb012955

Cited by 20 publications

(13 citation statements)

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“…The Multiridge [36] method is a multiscale technique of the potential field, based on the detection of the extrema of the considered field, and of its derivatives, also called edges. In particular, the ridges, defined as the lines passing through the edges related to different spatial scales, intersect at the source center, and so the method allows for investigating about the depth and the horizontal position of sources from the ridges analysis of the field [46]. The method is stable, performs a high-resolution analysis and allows the separation of interfering contributions, which are common in a multi-source case [43].…”

Section: Multiridge Methodsmentioning

confidence: 99%

Multiscale Analysis of DInSAR Measurements for Multi-Source Investigation at Uturuncu Volcano (Bolivia)

et al. 2019

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Uturuncu volcano (southwestern Bolivia) is localized within one of the largest updoming volcanic zones, the Altiplano Puna Volcanic Complex (APVC). In several geodetic studies the observed uplift phenomenon is analyzed and modeled by considering a deep source, related to the Altiplano Puna Magma Body (APMB). In this framework, we perform a multiscale analysis on the 2003–2010 ENVISAT satellite data to investigate the existence of a multi-source scenario for this region. The proposed analysis is based on Cross-correlation and Multiridge method, pointing out the spatial and temporal multiscale properties of the deformation field. In particular, we analyze the vertical component of ground deformation during two time interval: within the 2005–2008 time interval an inflating source at 18.7 km depth beneath the central zone of the APVC is retrieved; this result is in good agreement with those proposed by several authors for the APMB. Between August 2006 and February 2007, we identify a further inflating source at 4.5 km depth, beneath Uturuncu volcano; the existence of this latter, located just below the 2009–2010 seismic swarm, is supported by petrological, geochemical, and geophysical evidence, indicating as a possible interpretative scenario the action of shallow, temporarily trapped fluids.

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Section: Multiridge Methodsmentioning

confidence: 99%

Multiscale Analysis of DInSAR Measurements for Multi-Source Investigation at Uturuncu Volcano (Bolivia)

et al. 2019

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“…Here, a strong difference between the EEC and Paleozoic platforms occurs clearly because of the intense |∇T | highs covering most of the EEC and the substantially non-magnetic behavior of the Paleozoic Platform characterized by a few sparse, weak and isolated anomalies. Huge |∇T | highs are located above the TESZ region, which, according to Milano et al (2016), suggests the TESZ as a magnetic structure involving the whole crust down to the deep lithosphere. This picture seems to favor hypothesis B as the main cause of the CEML.…”

Section: Magnetic Field At 100 Kmmentioning

confidence: 99%

“…9c, we performed the same type of joint analysis in the area of the Brabant Massif, Namur Basin and Ardennes Massif. Magnetic and paleomagnetic studies (e.g., Molina Garza and Zijderveld, 1996) have pointed out Paleozoic carbonate rocks in Belgium characterized by uniform reverse polarity as a consequence of regional remagnetization events that occurred during tectonic and orogenic activity at late Carboniferous times. In the magnetic field map, we observe two intense magnetic lows, with no clear presence of their relative highs, which transform to two highs in the |∇T | map.…”

Section: Magnetic Field At 100 Kmmentioning

confidence: 99%

“…Based on the satellite data alone, the proposed reverse polarity of the TESZ magnetic anomaly is not totally resolved or explained. Recently, Milano et al (2016) performed a multiscale analysis on a threedimensional aeromagnetic dataset in central Europe and produced a model of the deep magnetic sources; they found that the origin of the high-altitude magnetic field in central Europe was mainly due to changes in crustal thickness and physical properties between western and eastern Europe. To resolve the situation we have both enhanced the spectral content of magnetic data and applied new analytical methods to the data.…”

Section: Introductionmentioning

confidence: 99%

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Joint analysis of the magnetic field and total gradient intensity in central Europe

2019

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Abstract. In the European region, the magnetic field at satellite altitudes (∼350 km) is mainly defined by a long-wavelength magnetic low, called the Central European Magnetic Low (CEML) here, located to the southwest of the Trans-European Suture Zone (TESZ). We studied this area through a joint analysis of magnetic and total gradient (∇T) anomaly maps for a range of different altitudes of 5, 100 and 350 km. Tests on synthetic models showed the usefulness of the joint analysis at various altitudes to identify reverse dipolar anomalies and to characterize areas in which magnetization is weak. This way we identified areas where either reversely or normally magnetized sources are locally dominant. At a European scale these anomalies are sparse, with a low degree of coalescence effect. The ∇T map indeed presents generally small values within the CEML area, indicating that the Paleozoic Platform is weakly magnetized. At 350 km of altitude, the TESZ effect is largely dominant: with intense ∇T highs above the East European Craton (EEC) and very small values above the Paleozoic Platform, this again denotes a weakly magnetized crust. Small coalescence effects are masked by the trend of the TESZ. Although we identified sparsely located reversely magnetized sources in the Paleozoic Platform of the CEML, the joint analysis does not support a model of a generally reversely magnetized crust. Instead, our analysis strongly favors the hypothesis that the CEML anomaly is mainly caused by a sharp contrast between the magnetic properties of the EEC and Paleozoic Platform.

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“…Based on the satellite data alone, the proposed reversepolarity of the TESZ magnetic anomaly is not totally resolved or explained. Recently, Milano et al (2016) performed a multiscale analysis on a three-dimensional aeromagnetic dataset in central Europe and produced a model of the deep magnetic sources; they found that the origin of the high-altitude magnetic field in central Europe was mainly due to changes of crustal thickness and of physical properties between western and eastern Europe. To resolve the situation we have both enhanced the spectral content of magnetic data and applied new analytical methods to the data.…”

Section: Introductionmentioning

confidence: 99%

Joint analysis of the magnetic field and Total Gradient Intensity in Central Europe

Milano¹,

Fedi²,

Fairhead³

2019

Preprint

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Abstract. In the European region, the magnetic field at satellite altitudes (~ 350 km) is mainly defined by a long-wavelength magnetic-low called here the Central Europe Magnetic Low (CEML), located to the southwest of the Trans European Suture Zone (TESZ). We studied this area by a joint analysis of the magnetic and total gradient (∇T) anomaly maps, for a range of different altitudes of 5 km, 100 km and 350 km. Tests on synthetic models showed the usefulness of the joint analysis at various altitudes to identify reverse dipolar anomalies and to characterize areas in which magnetization is weak. By this way we identified areas where either reversely or normally magnetized sources are locally dominant. At a European scale these anomalies are sparse, with a low degree of coalescence effect. The ∇T map indeed presents generally small values within the CEML area, indicating that the Palaeozoic Platform is weakly magnetized. At 350 km altitude, the TESZ effect is largely dominant: with intense ∇T highs above the East European Craton (EEC) and very small values above the Palaeozoic Platform, this again denoting a weakly magnetized crust. Small coalescence effects are masked by the trend of the TESZ. Although we identified sparsely located reversely magnetized sources in the Palaeozoic Platform of the CEML, the joint analysis does not support a model of a generally reversely magnetized crust. Instead, our analysis strongly favors the hypothesis that the CEML anomaly is mainly caused by a sharp contrast between the magnetic properties of EEC and Palaeozoic Platform.

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The deep crust beneath the Trans‐European Suture Zone from a multiscale magnetic model

Cited by 20 publications

References 54 publications

Multiscale Analysis of DInSAR Measurements for Multi-Source Investigation at Uturuncu Volcano (Bolivia)

Multiscale Analysis of DInSAR Measurements for Multi-Source Investigation at Uturuncu Volcano (Bolivia)

Joint analysis of the magnetic field and total gradient intensity in central Europe

Joint analysis of the magnetic field and Total Gradient Intensity in Central Europe

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