 Gunung Merbabu is a massive forested volcano that rises to the north above a broad 1500-m-high saddle from the renowned Merapi volcano in central Java. The volcano is elongated in a NNW-SSE direction, parallel to the trend of the long transverse volcanic chain extending from Merapi to Ungaran volcano. Three prominent U-shaped radial valleys extend from the 3145-m-high summit of Merbabu toward the NW, NE, and SE, dividing the volcano into three segments. The most recent magmatic eruptions originated from a NNW-SSE fissure system that cut across the summit and fed the large-volume Kopeng and Kajor lava flows on the northern and southern flanks, respectively. Moderate explosive eruptions have occurred from the summit crater of Merbabu in historical time |
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The Dieng plateau in the highlands of central Java is renowned both for the variety of its volcanic scenery and as a sacred area housing Java's oldest Hindu temples, dating back to the 9th century AD. The Dieng volcanic complex consists of two or more stratovolcanoes and more than 20 small craters and cones of Pleistocene-to-Holocene age over a 6 x 14 km area. Prahu stratovolcano was truncated by a large Pleistocene caldera, which was subsequently filled by a series of dissected to youthful cones, lava domes, and craters, many containing lakes. Lava flows cover much of the plateau, but have not occurred in historical time, when activity has been restricted to minor phreatic eruptions. Toxic volcanic gas emission has caused fatalities and is a hazard at several craters. The abundant thermal features that dot the plateau and high heat flow make Dieng a major geothermal prospect |
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Read more... [MOUNT DIENG]
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Merapi, one of Indonesia's most active volcanoes, dominates the landscape immediately north of the city of Yogyakarta in one of the world's most densely populated areas. Merapi is the youngest and southernmost of a volcanic chain extending NNW to Ungaran volcano. The steep-sided modern Merapi edifice, its upper part unvegetated due to frequent eruptive activity, was constructed to the SW of an arcuate scarp cutting the eroded older Batulawang volcano. Pyroclastic flows and lahars accompanying growth and collapse of the steep-sided active summit lava dome have devastated cultivated lands on the volcano's western-to-southern flanks and caused many fatalities during historical time. Since 1953, activity has been characterized by extrusion of lava into the summit crater, with periodic lava dome collapse and nuée ardente formation. Summit lava dome growth has continued since the 1969 gas explosion. It is monitored from the Merapi Volcano Observatory (MVO) in Yogyakarta |
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Read more... [MOUNT MERAPI]
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CENTRAL JAVA/JOGJAKARTA
