Estimates on the size of the Greek community in Armenia range from 1,800 to 5,000. The declining number of Greeks in Armenia in recent years is mainly due to mass migration to Greece from the former Soviet Union and because of Armenia's economic situation as a result of the First Nagorno-Karabakh War. It was further exacerbated by the Leninakan earthquake which in December 1988 struck northwestern Armenia, the area where most of the Greeks used to live. The largest Greek communities are in Yerevan and Alaverdi, followed by Vanadzor, Gyumri, Stepanavan and Noyemberyan.