An earthquake is a process that occurs due to the movement of tectonic plates and results in tremors of the Earth’s crust due to sudden release of energy. Global tectonic plates are closely related to the earthquakes as many of them occur near subduction zones.
There are two measures that describe the earthquake magnitude and intensity. The magnitude of the earthquake is the energy released during the earthquake. Its magnitude is being measured by using the seismograph and is expressed in degrees on the Richter scale (value from 0 to 10).
The intensity of an earthquake depends on several factors such as the amount of energy released, hypocentre depth, epicenter distance and structure of the Earth’s crust. Its effect is expressed using the Mercalli-Cancani-Sieberg scale that has 12 stages, based on the destructive consequences of the earthquake.
Countries in which most of the earthquakes occur are Chile, Japan and Indonesia. The most pronounced seismic zone is the Pacific fiery circle (53% of all earthquakes) in the Mediterranean-Alpine-Himalayan region (41%). Quiet or non seismic areas are zones of ancient mountains and the masses (the Canadian Shield, the Russian plate etc.).
Urban areas are endangered by earthquakes, hence we have created a map for you to see how many earthquakes have epicenter in those zones. The map shows all of the earthquakes and Spatially selected earthquakes in Urban areas by Richter scale. In this case we used earthquake geometry type to intersect with the geometry of the Urban areas. By doing so we were able to get earthquakes in Urban areas.