YERBİLİMLERİ/ Bulletin for Earth Sciences, a publication of the Hacettepe University Earth Sciences Application and Research Center, was orginally established in 1976, and has been published since then. The objective of the Journal is to provide a national and international contribution to the development of earth sciences professions. The Journal is a national and international medium for the publication of original scientific studies, new developments, case studies and comprehensive reviews in all fields of earth sciences (geology, geophysics, mining, geomorphology, geotechnics, hydrogeology, geostatistics etc.). In addition to original articles, the Journal also publishes discussions of papers which have already appeared in the Journal. The languages of the Journal are Turkish and English. The Journal is published 3 times (April, August and December) a year.