In August, 1984, Robert Y. Koyanagi, Seismologist, and George Kojima, Electronics Technician were missioned to Indonesia to evaluate the radio telemetered seismic network (RTS) at Merapi Volcano Observatory located at Yogyakarta in Central Java.
Merapi Volcano in Central Java is the most active volcano in Indonesia. Eruptions have occurred very frequently (approximately once in a year as recorded since 1920) and it is situated in a densely populated area. Therefore it may be classified as a very dangerous volcano.
Volcanio gases are the primo mover of the eruptions which drags the magma up towards the earth's surface. And because of their much lower viscosity, volcanic gases are far more fast than the magma they come from to give some informa-tions.
This Volcano is known as very dengerous, because its eruptions always caused victims and destroyed of arable land. The origin of the disaster because its has a crater lake on its summit, which is in ejected during each eruption.
Merapi volcano is one of the most active volcanoes of Indonesia. The activity was dated back to the year 1006, when the volcano erupted violently destroying the Kingdom of Mataram and buried the Borobudur temple.
Since the end of the 1982 - 1983 eruption of Galunggung volcano, west Java, a large and growing lake has formed within the 1982 - 1983 crater. The volume of this lake in July 1986 is approximately 6.1 million cubic meters of water. This water is accumulating at a rate of approximately 2.6 million cubic meters per year.
In August, 1984, Robert Y.Koyanagi, Seismologist, and George Kojima, Electronics technician were missioned to Indonesia to evaluate the radiotelemetered seismic network (RTS) at Merapi Volcano Observatory located at Yogyakarta in Central Java.
See where the ground in trembling fever quakes And darts galvanic fires; the clouds of smoke Ascend on high, the bolts to heaven fly In all directions; Ashes fall like snow, And scorch the ground; the burning lava boils, Like melted iron flows, and desolation Is spreading far: high hill arise, where none Before had stood, while others fall or sink. The fields of men, their homes, their ca…
Geophysical methods of surveillance of active volcanoes are generally considered as a basic means for prediction of volcanic activity. Among various geophysical forerunners of eruptions, seismic events are most common to both basaltic and andesitic volcanoes, and it is customary to think they give effective warning to the people living close to active volcanoes. However, volcanic eruptions are …
This report concerns magnetic fields measurements exclusively. It is a continuation of the 1977 report on the same subject. In the field, a number of scientists were involved, under mutually encouraging conditions.