Hospital patients have been moved outside due to fears of aftershocks. One Yogyakarta clinic alone says it is treating 1,500 people injured by the quake. Electricity and communications are down across the city and, with the airport severely damaged and many major roads closed, it is unclear when help from outside will arrive. The epicentre of the quake – which struck just before 6 am local time – was offshore, triggering widespread panic as fears grew that the area would be hit by a tsunami.Indonesia sits on the Asia-Pacific’s so-called “Ring of Fire”, marked by heavy volcanic and tectonic activity. Yogyakarta is the country’s ancient royal capital and one of its biggest cities. It is near Mount Merapi, a volcano that has been on high alert for a major eruption this month. Experts say the quake was not caused by the volcano, but Merapi’s activity has increased since the shock.