Natural disasters are the, most serious potential threats to human being and their environments. Japan and Indonesia have the same type of natural hazards because of their similarity in tectonic setting. This was a major factor motivating the establishment of cooperative programs between Japan and Indonesia to understand the natural phenomena and th…
The Emperor vein system lies on the eastern margin of the Tavua volcanic structure. This is of Miocene age and occurs in basalts(the Mba Volcanics) probably underlain at about 2 km by calcite-rich sediments (the Vatukoro Formation). The lodes are generally flatmakes, or steep fault fillings, or complex shatter zones, and consist of quartz and altere…
Volcanic hazard mitigation program in Indonesia contitutes volcanic monitoring, hazard map preparation, public education, engineering construction and• public awareness. In the last 200 year, 175 thousand people were killed by volcanic eruption. The number has significantly descreased due to the intensive imple…
Perlite is a glassy yolcanic rock which will upon Tap id and controlled heating, expand or ''pop" into a frothy aterial of low bulk density -valued as a lightweight aggregate. Occurrences and commercial deposits of perli te are iknown throughout the world as well~exposed flows and domes of Tertiary and Quaternary age like most of the -volcanic …
Investigations of the acid volcanic rocks in New• Zealand have shown that the must promising perlite deposits are the glassy rhyolites of the Taupo-Rotorua and Tuirua districts. Tl,c Lest-grade rock is at Ongaroto, Maroa, Tairua, and Lake lfotoma. Large quantities …