Telah lama Gunung Merapi menjadi pusat perhatian para ahli. Sejak zaman penjajahan Belanda, Gunung Merapi telah menjadi prioritas bagi pemerintahan colonial dalam usaha pemantauan gunungapi. Pada saat itu perhatian diarahkan ke Gunung Merapi hanya karena gunung ini mempunya aktivitas yang hamper berlangsung secara menerus.
Merapi volcano is one of the most active volcanoes in the world and during the last 3000 yrs, it has been more or less continuously in eruption. Merapi volcano is a stratovolcano with a south-west facing horseshoe-shaped summit crater filled by a lava dome. Its composition rangers from basalt to basaltic andesite (52 to 56% SiO2) and it has high Al2O3 (18.5 to 20.2% wt) and medium to high K2O …