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Measuring and analyzing earth's gravitational field at the surface is one of the main tools to study the structure and composition of the Earth. The gravity method helps Geology in describing subsoil lithological variation based on density anomalies.
Map of the world at scale 1:15 000 000 (version in three assembling sheets) or 1:22 000 000 (version in a single sheet) represented as a planisphere with Robinson Projection. Polar regions are at scale 1:25 000 000 or 1:35 000 000 with Universal Polar Stereographic (UPS) projection. The cartographic content includes the continental relief, vegetal cover, states and their borders and capitals, main cities, main Unesco World Heritage Sites, submarine relief and bathimetric colours. The toponimy is in catalan language.
Borehole geophysical logging techniques are based on measuring and recording continuously the physical properties of interest along a borehole using different probes. Analysis of the correlation between the different records (logs) allows to characterize lithological section and formation fluids.
This method puts emphasis on the measurement of anomalies of the Earth's magnetic field, caused by the presence of reservoirs or structures on the subsurface. This technique allows to assess changes of nT in the Earth's magnetic field caused by the presence of some minerals. Those minerals are characterized by high magnetic susceptibility such as the magnetite.
Seismic reflection method is based on the propagation of seismic waves inside the earth. This method analyzes the reflected waves which are generated on or near the surface by a seismic source, travel down into the ground, reflect at a discontinuity (density and velocity contrast) and travel back up to the ground surface. Digital processing of seismic reflection data offers the opportunity to create cross-sectional images of the subsurface (seismic reflection section) showing the amplitude of the reflected wave at the correct horizontal and depth coordinate of the reflection point.
Seismic refraction method is based on analyzing the travel times of waves refracted under the critical angle on subsoil interfaces (velocity contrasts). Seismic energy is radiated downwards into the ground from a seismic source on or near the ground surface (e.g. weight drop, explosives,etc.), critically refracted at the interface travelling along it and radiated back to the surface. Observed refracted waves travel-times versus distance are converted into seismic velocity cross-sections of the subsurface.
The Magnetotelluric method (MT) uses natural electromagnetic fields (electrical storms, ionosferic currents) as a source to study subsoil structure. Simultaneous recording of the horizontal electric and magnetic field variations on earth surface allows to determine the electrical resistivity variation as a function of the frequency (depth). Frequency band for MT data ranges from 0.001 Hz to 100 Hz that makes it possible to study depths of up to hundreds of km. For shallow studies (around 1 km investigation depth), control source audiomagnetotellurics method (CSAMT) or audiomagnetotellurics methods (AMT) are required. Frequency band in this type of studies ranges from 1 Hz to 100 KHz.
It collects information about epicenters of earthquakes felt by the habitants.The catalog covers the period from ancient times until today.
The GeoBase of soils of Catalonia v1.0 is a database intended to store information on soils caught in the field and that necessary for generate soil maps of the territory of Catalonia at different scales, such as the Soil Map 1: 25,000 of Catalonia (MSC25M), or other maps that have been previously prepared (eg at scales 1: 25,000 and 1: 250,000). Contains information on soil profiles with varying levels of detail captured in the field (observations and pits), the composition on horizons, some of its physical and chemical characteristics as well as different types of soils that appear in an area, its spatial distribution.