Table of Contents
What type of plate boundary is Mt Galunggung?
Mount Galunggung is part of the Sunda Arc extending through Sumatra, Java and the Lesser Sunda Islands, which has resulted from the subduction of the Australian plate beneath the Eurasian plate….
| Galunggung | |
|---|---|
| Geology | |
| Mountain type | Stratovolcano |
| Last eruption | January 1984 |
What is the composition of the Galunggung volcano?
Galunggung volcanic rocks are basalt (49 – 53 % SiO2) to basaltic andesite (53 – 57 % SiO2) having porphyritic textures with medium sized phenocrysts (15 – 40 %), mainly plagioclase (av. 18 %) and clinopyroxene (1.6 %).
What is the plate tectonic setting of Indonesia?
Indonesia sits along the “Pacific Ring of Fire” where several tectonic plates collide and many volcanic eruptions and earthquakes occur. This earthquake occurred along the Java-Sumatra subduction zone, where the Australian tectonic plate moves underneath Indonesia’s Sunda plate.
What magma types produce explosive and effusive eruptions?
Basaltic eruptions Basaltic composition magmas are the most common effusive eruptions because they are not water saturated and have low viscosity. Most people know them from the classic pictures of rivers of lava in Hawaii. Eruptions of basaltic magma often transition between effusive and explosive eruption patterns.
Is Bali on a tectonic plate?
In the case of Indonesia and Bali, 2 of these plates are concerned: the Indo-Australian oceanic, and the Sonde’s continental plate. As they move closer to each others,it creates a phenomenon called subduction. This happen when one tectonic plate, in this case the Indo-Australian oceanic, sinks under the other one.
How big is the crater of the Galunggung volcano?
According to the latest report from CVGHM, the present-day lake in the conical crater of Galunggung volcano has a diameter of 1 km and a typical depth of 11 m. In the middle of the lake sits a small, 30 m high, 250 x 165 m scoria cone which was produced during the final stage of the 1982-83 eruption.
Where is the Mount Galunggung in West Java?
Mount Galunggung (Indonesian: Gunung Galunggung, formerly spelled Galoen-gong) is an active stratovolcano in West Java, Indonesia, around 80 km (50 mi) southeast of the West Java provincial capital, Bandung (or around 25 km (16 mi) to the east of the West Java town of Tasikmalaya).
How tall is the scoria cone from Galunggung?
In the middle of the lake sits a small, 30 m high, 250 x 165 m scoria cone which was produced during the final stage of the 1982-83 eruption. Galunggung’s hazards include phreatic and phreatomagmatic eruptions capable of draining the lake and producing mud flows.
When did the seismic activity at Galunggung decrease?
CVGHM reported that, since the Alert Level was raised on 12 February, seismic activity at Galunggung had drastically decreased through 27 May. During 27 April-27 May plants around the crater area looked green and lush, small fish were swimming in the water, and insects around the crater were active.