About 7000 earthquakes have been recognized and recorded in history and by instruments. The earthquakes that have been reported before 1900 are called historical. The other earthquakes, which have been recorded by seismographs, are called instrumental earthquakes. Each of the recorded earthquakes has some information on date, time, magnitude, coordinates, province and hypocenter location on 1:100,000 and 1:250,000 sheets of districts, counties, provinces and quadrangles of recorded source map of event and also hypocenter depth. If an earthquake causes a lot of damage, then all the related information will be mentioned on the maps. Authentic information centers and public education institutes also report the deep mechanism of earthquake. If a center records such data, it will be presented on the maps, too. In case of high magnitude or destructive earthquakes, this information will be presented together with the name of recording institute.