1,720,968 research outputs found
Multidisciplinary approach to the study of a crustal tectonic discontinuity: an example from the Central Mediterranean offshore (Sicily channel)
Full text linkEarthquake location in Central Mediterranean area by means of pseudo 3D velocity model: a procedure for velocity models optimization
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New constraints for geodynamic and seismogenic processes in the Central Mediterranean: Lithospheric Model, Moho Topography, And Ionian Crustal Subduction Seismogenic Volume
Full text linkThe study of geodynamic and seismogenic processes of a tectonically active and complex area such as the Central Mediterranean needs a multidisciplinary study by integrating advanced techniques for seismicity characterization, definition of seismogenic structures, and crustallithospheric modeling. In this work we present a high-resolution 3D litospheric model for the Central Mediterranean area, also describing in detail the geometry of the subduction ionic crustal seismogenic volume (CSV), and the most complete and detailed Moho map currently available for this area. We obtained the lithospheric model and the Moho map by analyzing velocity models, gravimetric profiles, interpreted seismic profiles, and conversion of seismic profiles from time (TWT) to depth, and constructed the CSV using the hypocenters of seismic events with a statistical approach. Of the latter, we analyzed its geometric characteristics and compared it with previous models present in the literature. We propose these models, which can be easily updated, as a constraint for understanding the subduction zone and the related seismic and tzunami hazard. We consider them to be helpful tools for high-resolution geophysical studies of the crustal and geodynamic structure of the area, for the identification of new seismogenic sources, and for improving the location and size of the ones already identified. They are also key constraints for improving the accuracy of locating seismic events in the area affected by errors due to the complex topography of the area and the not uniform spatial distribution of seismic stations
Improved velocity models for earthquake location in Sicily and surrounding region (Central Mediterranean)
Full text linkMagnetic investigation at vulcano island: preliminary results from a multidisciplinary geophysical survey
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A preliminary 3D model for the offshore region of the CARG Sheet Villa San Giovanni
Full text linkThe Sheet 588 Villa San Giovanni of the CARG project covers a geologically complex area that includes the Messina Strait and surrounding areas. The Messina Strait area has long been the focus of geological and geodynamic studies, mainly due to its dynamic tectonic framework that includes active fault systems and ongoing subduction processes. This tectonic setting is responsible for significant seismic activity, with events that can reach great depths, up to about 180 km. In addition to its geological relevance, the region has attracted considerable socio-economic interest, particularly in relation to the proposed permanent connection between the two sides of the Strait. Accordingly, the complex geology of the area requires detailed and precise geological modeling. As part of the CARG project, we constructed a preliminary 3D geological model of the offshore sector that provides information on the subsurface structure. We used seismic reflection profiles, we converted them from time (TWT) to depth using appropriate velocity models, and, to improve the accuracy of the model, we calibrated the seismic reflection profiles with available well data. The preliminary model we obtained consists of four layers. To highlight the lateral variation of the model, we also constructed thickness maps of each layer. Future steps in this study include the acquisition of new seismic reflection profiles to have greater areal coverage of the data. The integration of these new seismic profiles, together with other geophysical and geological data, will help to obtain a more accurate and extensive subsurface structure model. This study is also intended to contribute to a better comprehension of the geological environment in the Messina Strait, providing essential data for seismic hazard assessment
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