scholarly journals Amphibole megacrysts as a probe into the deep plumbing system of Merapi volcano, Central Java, Indonesia

Author(s):  
Stefan T. M. Peters ◽  
Valentin R. Troll ◽  
Franz A. Weis ◽  
Luigi Dallai ◽  
Jane P. Chadwick ◽  
...  
2021 ◽  
pp. 73-91
Author(s):  
Michael R. Dove

This chapter discusses an ancient South Asian and Southeast Asian cosmology of rule, based on the “mandala.” According to this concept, earthly harmony is achieved by replicating the macrocosm of the universe in the microcosm of the earthly kingdom. Unexplored in the literature on mandala kingdoms, however, are the implications of this concept for state surveillance. This is illustrated by the Yogyakarta Sultanate in Central Java, which was historically structured along mandala lines. Lying at the foot of Merapi volcano, the lowland court is thought to have a spirit counterpart in the crater of the volcano. Perturbation in the sultanate — political misdeeds, for example — is thought to result in perturbation in the spirit world of the volcano. Belief in this linkage between mundane and spirit worlds is reflected in close surveillance of volcanic activity by the Yogyakarta court and also by the national government. This surveillance calls to mind the concept of the panopticon prison. The concept of the mandala and derivative ideas, like that of seeking insight from mountains and mirrors, are — like the panopticon itself — essentially perspectivist in character and give people a valuable perspective on living in a hazardous environment like Merapi volcano.


1995 ◽  
Vol 57 (2) ◽  
pp. 111-116 ◽  
Author(s):  
Suparto Siswowidjoyo ◽  
Ismangun Suryo ◽  
Izumi Yokoyama
Keyword(s):  

Geology ◽  
2019 ◽  
Vol 47 (12) ◽  
pp. 1171-1175
Author(s):  
Lilu Cheng ◽  
Fidel Costa

Abstract Forecasting the timing and size of volcanic eruptions requires a proper interpretation of multiparametric monitoring signals. Studies of the erupted rocks can provide critical information on the processes and volcano plumbing system that is needed to decode the monitoring signals. Here we present the results of a petrological study of plagioclase phenocrysts using a new statistical approach that allows us to estimate the amount of intruded magma before eruption. Our crystal population analysis of the 2006 and 2010 CE Merapi volcano (Indonesia) eruptions shows that ∼60 ± 20 vol% of the 2010 magma was left over from the 2006 magma, and thus ∼40 ± 20 vol% was newly intruded magma. Using the published values of the 2010 erupted magma volume, this corresponds to >8 to 20 (±7) × 106 m3 of new magma. This is a minimum estimate and is similar to the inferred pre-eruptive deformation volume (18 ×106 m3), although given the uncertainties, several million cubic meters of magma intruded in 2010 could still be in the Merapi plumbing system. Our approach could be used at other volcanoes to quantify the volume of intruded magma and thus help in better understanding the unrest signals that anticipate eruptions.


Geomorphology ◽  
2016 ◽  
Vol 273 ◽  
pp. 244-257 ◽  
Author(s):  
Frédéric Gob ◽  
Emmanuèle Gautier ◽  
Clément Virmoux ◽  
Delphine Grancher ◽  
Vincent Tamisier ◽  
...  

2000 ◽  
Vol 100 (1-4) ◽  
pp. 457-478 ◽  
Author(s):  
F Lavigne ◽  
J.-C Thouret ◽  
B Voight ◽  
K Young ◽  
R LaHusen ◽  
...  
Keyword(s):  

2021 ◽  
Vol 873 (1) ◽  
pp. 012077
Author(s):  
E. Fernanda ◽  
A. Bilqis ◽  
L. Julio ◽  
K. Nursal ◽  
Y. H. Christ ◽  
...  

Abstract The arc magmatism and volcanic activity in Java are dominated by the subducting plate of Indo-Australian into the Eurasian plate. Merapi volcano is located in Central Java and known as one of the most active volcanoes in the world. Several studies have tried to estimate the magma reservoir zone in Mt. Merapi and suggested multiple layers of reservoirs with the shallow one at 1-2 km and a deeper at 6 -9 km or 15 km. The Low-Frequency Passive Seismic is one method to analyze the frequency spectrum below the recording station. Previous related studies show a promising a relation between hydrocarbon reservoir and higher amplitude at vertical component at a frequency between 0.1 – 6 Hz. An observation at the volcano sites have also been reported to display a different spectrum amplitude at the vertical component. This study exploited the same method in LFPS to analyze the frequency spectrum at Mt. Merapi and Mt. Merbabu. We use seismic data from the DOMERAPI temporary seismic network installed in the neighborhood of Merapi and Merbabu volcano. We analyze 53 broad-band seismometers data from October 2013 to mid-April 2015. We also add several stations from MERAMEX network instruments to compare spectrum analysis outside the Merapi and Merbabu volcano. We also removed some tele-seismic and regional events from the data to better analyze the LFPS signal. We have seen a higher amplitude in vertical component near Mt. Merapi and will proceed to analyze all stations.


Author(s):  
Sari Bahagiarti Kusumayudha ◽  
I Made Oki Sanjaya ◽  
Helmy Murwanto ◽  
Sugeng Raharjo

Kali Putih (The White River) is located in Srumbung district, Magelang regency, Central Java, Indonesia. It is originated from the upper slope of Merapi volcano, flowing to the Southwest direction. Kali Putih belongs to one of the most channels where frequently flowed by lahar of Merapi volcano. Based on geomorphological and geological traces found at the surrounding of modern Kali Putih channel, this indicated that the flow of Kali Putih has undergone displacement several times. The position of ancient river valley in the past has changed into the modern river valley in the present time. The existence of ancient Kali Putih is exhibited by the presence of large dry valley morphology associated with volcanic blocks, gravels, and sand sized materials with various sorting, representing the characteristics of lahar and alluvial deposits. In the present time, the former river channels are currently used by local people for agricultural and fisheries land.


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