Volcano Calbuco may have paused its eruption for now, but Chile remains on red alert after the mount spewed ash more than 20 km high on Wednesday.<br /><br /> Precautions are being taken as vulcanologists warn it remains unstable and could erupt again.<br /><br /> Over 4,000 people have been evacuated from the immediate area, as the ash threatened to contaminate water supplies and create respiratory problems for residents.<br /><br /> President Michelle Bachelet announced that a health alert had been put in place covering the area around the 20km evacuation zone, adding that they will continue to evaluate as the situation develops.<br /><br /> The volcano located some 1,000 kms south of Chile’s capital Santiago had lain dormant for nearly five decades before erupting twice in the space of 24hrs.<br /><br /> Que bestia la erupción del volcán Calbulco https://t.co/zGJ0tDW7sZ— a l a n (@alanmonzon) April 22, 2015<br /><br /> Most of the ash cloud has been blown over the mountains in the north-east to neighbouring Argentina, forcing flights to be
