Both volcanoes and earthquakes threaten Japan. Japan has 19 active volcanoes, several of which have erupted in the last decade. Earthquakes are also frequent occurrences, with many very destructive quakes in the last century. In 1923 a major earthquake (approximately 8.3 on the Richter scale) struck Yokohama and killed over 140,000 people. More recently, in 1995, an earthquake in Kobe killed 5,500 people.