Along-arc heterogeneity in crustal architecture and subduction input at the Sunda arc in Java, Indonesia

2006 ◽  
Vol 70 (18) ◽  
pp. A227
Author(s):  
H.K. Handley ◽  
C.G. Macpherson ◽  
J.P. Davidson ◽  
R. Gertisser
Keyword(s):  
Sunda Arc ◽  
Subduction Input

scholarly journals Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Frances M. Deegan ◽  
Martin J. Whitehouse ◽  
Valentin R. Troll ◽  
Harri Geiger ◽  
Heejin Jeon ◽  
...  
Keyword(s):  
Mantle Source ◽  
Secondary Ion Mass Spectrometry ◽  
Isotope Composition ◽  
Isotope Analysis ◽  
Sunda Arc ◽  
Mid Ocean Ridge ◽  
Plumbing Systems ◽  
Ocean Ridge ◽  
Secondary Ion ◽  
Magma Plumbing

AbstractMagma plumbing systems underlying subduction zone volcanoes extend from the mantle through the overlying crust and facilitate protracted fractional crystallisation, assimilation, and mixing, which frequently obscures a clear view of mantle source compositions. In order to see through this crustal noise, we present intracrystal Secondary Ion Mass Spectrometry (SIMS) δ18O values in clinopyroxene from Merapi, Kelut, Batur, and Agung volcanoes in the Sunda arc, Indonesia, under which the thickness of the crust decreases from ca. 30 km at Merapi to ≤20 km at Agung. Here we show that mean clinopyroxene δ18O values decrease concomitantly with crustal thickness and that lavas from Agung possess mantle-like He-Sr-Nd-Pb isotope ratios and clinopyroxene mean equilibrium melt δ18O values of 5.7 ‰ (±0.2 1 SD) indistinguishable from the δ18O range for Mid Ocean Ridge Basalt (MORB). The oxygen isotope composition of the mantle underlying the East Sunda Arc is therefore largely unaffected by subduction-driven metasomatism and may thus represent a sediment-poor arc end-member.

Back arc thrusting in the Eastern Sunda Arc, Indonesia: A consequence of arc-continent collision

1983 ◽  
Vol 88 (B9) ◽  
pp. 7429-7448 ◽  
Author(s):  
Eli A. Silver ◽  
Donald Reed ◽  
Robert McCaffrey ◽  
Yoko Joyodiwiryo
Keyword(s):  
Sunda Arc ◽  
Back Arc

Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision

Geology ◽  
2021 ◽  
Author(s):  
Yu-Ming Lai ◽  
Sun-Lin Chung ◽  
Azman A. Ghani ◽  
Sayed Murtadha ◽  
Hao-Yang Lee ◽  
...  
Keyword(s):  
Plate Tectonics ◽  
Volcanic Rocks ◽  
Plate Boundary ◽  
Andaman Sea ◽  
Fundamental Aspect ◽  
Benioff Zone ◽  
The North ◽  
Sunda Arc ◽  
Subduction Zone Processes ◽  
Zone Depth

The migration of arc magmatism that is a fundamental aspect of plate tectonics may reflect the complex interaction between subduction zone processes and regional tectonics. Here we report new observations on volcanic migration from northwestern Sumatra, in the westernmost Sunda arc, characterized by an oblique convergent boundary between the Indo-Australian and Eurasian plates. Our study indicates that in northwestern Sumatra, volcanism ceased at 15–10 Ma on the southern coast and reignited to form a suite of active volcanoes that erupt exclusively to the north of the trench-parallel Sumatran fault. Younger volcanic rocks from the north are markedly more enriched in K2O and other highly incompatible elements, delineating a geochemical variation over space and time similar to that in Java and reflecting an increase in the Benioff zone depth. We relate this mid-Miocene volcanic migration in northwestern Sumatra to the far-field effect of propagating extrusion tectonics driven by the India-Eurasia collision. The extrusion caused regional deformation southward through Myanmar to northwestern Sumatra and thus transformed the oblique subduction into a dextral motion–governed plate boundary. This tectonic transformation, associated with opening of the Andaman Sea, is suggested to be responsible for the volcanic migration in northwestern Sumatra.

Large submarine slide (olistostrome) associated with Sunda Arc subduction zone, northeast Indian Ocean

1976 ◽  
Vol 21 (3) ◽  
pp. 211-226 ◽  
Author(s):  
David G. Moore ◽  
Joseph R. Curray ◽  
Frans J. Emmel
Keyword(s):  
Indian Ocean ◽  
Subduction Zone ◽  
Submarine Slide ◽  
Sunda Arc

scholarly journals A probabilistic tsunami hazard assessment for Indonesia

2014 ◽  
Vol 14 (11) ◽  
pp. 3105-3122 ◽  
Author(s):  
N. Horspool ◽  
I. Pranantyo ◽  
J. Griffin ◽  
H. Latief ◽  
D. H. Natawidjaja ◽  
...  
Keyword(s):  
Hazard Assessment ◽  
Risk Mitigation ◽  
Tsunami Hazard ◽  
Indian Ocean Tsunami ◽  
North Coast ◽  
Return Periods ◽  
Sunda Arc ◽  
Annual Probability ◽  
Tsunami Hazard Assessment ◽  
Probabilistic Tsunami Hazard Assessment

Abstract. Probabilistic hazard assessments are a fundamental tool for assessing the threats posed by hazards to communities and are important for underpinning evidence-based decision-making regarding risk mitigation activities. Indonesia has been the focus of intense tsunami risk mitigation efforts following the 2004 Indian Ocean tsunami, but this has been largely concentrated on the Sunda Arc with little attention to other tsunami prone areas of the country such as eastern Indonesia. We present the first nationally consistent probabilistic tsunami hazard assessment (PTHA) for Indonesia. This assessment produces time-independent forecasts of tsunami hazards at the coast using data from tsunami generated by local, regional and distant earthquake sources. The methodology is based on the established monte carlo approach to probabilistic seismic hazard assessment (PSHA) and has been adapted to tsunami. We account for sources of epistemic and aleatory uncertainty in the analysis through the use of logic trees and sampling probability density functions. For short return periods (100 years) the highest tsunami hazard is the west coast of Sumatra, south coast of Java and the north coast of Papua. For longer return periods (500–2500 years), the tsunami hazard is highest along the Sunda Arc, reflecting the larger maximum magnitudes. The annual probability of experiencing a tsunami with a height of > 0.5 m at the coast is greater than 10% for Sumatra, Java, the Sunda islands (Bali, Lombok, Flores, Sumba) and north Papua. The annual probability of experiencing a tsunami with a height of > 3.0 m, which would cause significant inundation and fatalities, is 1–10% in Sumatra, Java, Bali, Lombok and north Papua, and 0.1–1% for north Sulawesi, Seram and Flores. The results of this national-scale hazard assessment provide evidence for disaster managers to prioritise regions for risk mitigation activities and/or more detailed hazard or risk assessment.

Seismotectonic pattern and the source region of volcanism in the central part of Sunda Arc

2005 ◽  
Vol 25 (4) ◽  
pp. 583-600 ◽  
Author(s):  
Aleš Špičák ◽  
Václav Hanuš ◽  
Jiří Vaněk
Keyword(s):  
Source Region ◽  
Sunda Arc
Sign in / Sign up

Export Citation Format

Share Document