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.
An invitation issued by Unesco under the Volcanologist Exchange Programme has given opportunity to the authors to visit Mayon Volcano, South Luzon, The Philippines, which was reported to have shown an increasing activity early May this year. The first increasing volcanic phenomenon was observed on May 3, and harmonic tremors were recorded the following days. The precaution measures have then be…
Mt. Merapi is one of the most active volcanoes in Indonesia, geologically is situated on the intersection of two faults of regional importance, namely the transverse fault which separates East Java from Central Java, and a longitudinal fault through Java which forms the boundary between the western Kendeng Ridge and the Ngawi sub Zone North of Simo.
A additional complexity of volcanic activity is the need to place it in a human context in order to avoid volcanic disaster. Photo-interpretation of the existing aerial photographs at 1: 50,000 scale dating from 1982 has been undertaken to greatly Increase the efficiency of the volcanic hazards survey at Semeru vulcano. This photo-interpretation map has been checked in the field, and a geomorph…
After the mapping done by the Topographical Survey in 1879, no other survey of the crater was made although it was known that sinde then the crater has changed its eruptive phase several times. It was decided in February 1921, that a new survey of the crater would be done for the purpose of knowing any changes and for putting down the topography of the present stage (see plate I).