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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.
Inventory of defence structures built to reduce the risk of avalanches. Single and lineal structures are documented, such as artificial avalanche release systems, road barriers, breakers, deflection structures, retention nets, screens, wind baffles, deflectors, rigid and flexible barriers, retention walls, reforestation and controlled areas.
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.
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.
Information regarding an area exposed to an avalanche. Mapped based on analysis of the terrain and of signs that avalanches leave in their path, mainly, in forests. In Avalanche Zones, avalanches occur frequently and are of different sizes. Avalanche Zones have been systematically mapped throughout the region. They are shown in orange. There are two types of Avalanche Zones: zones where avalanches usually follow the same path, shown in orange, and zones where avalanches usually follow different paths, shown in pale orange.
Physical properties and composition of geologic materials (rocks and sediments), their structure and their age as depicted in the Geological map 1:250,000, as well as geomorphological features and boreholes of Catalonia. This data set is conforming to the technical specifications of INSPIRE Administrative units.
It collects information about epicenters of earthquakes felt by the habitants.The catalog covers the period from ancient times until today.
The map contains the land values in Barcelona in 1995.
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.