Indonesia warned Tuesday its most active volcano could continue erupting for months […] Seismic activity escalated dramatically last week at the volcano on the densely populated island of Java, with increasing lava spurts and about 500 multi-phased volcanic earthquakes recorded. — Yahoo! News

More photos can be found searching for Merapi.

Photos from Joyo di Jogja, irwan+-+(vixtorirwan.com), and gwaksa.