Plate boundary reorganization in the active Banda Arc–continent collision: Insights from new GPS measurements

Nugroho, Hendro; Harris, Ron; Lestariya, Amin Widada; Ma'ruf, Bilal

doi:10.1016/j.tecto.2009.01.026

Cited by 93 publications

(105 citation statements)

References 33 publications

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“…Relative to the Sundaland block, a tectonic domain that is extruding eastward away from Eurasian Plate (Rangin et al 1999), the Indo-Australian Plate converges NNE at a rate of around 70 mm/a (Nugroho et al 2009). The Indo-Australian Plate subducts beneath the Banda Arc from three sides along the Timor, Tanimbar and Seram Troughs.…”

Section: Tectonic Settingmentioning

confidence: 99%

“…The amount of movement along these thrust systems decreases to the west where the oblique collision is less developed (Silver et al 1983). Even in the most advanced part of the collision in the Timor region, there is still up to 21 mm/a of convergence measured across the Timor Trough (Nugroho et al 2009), which means that a significant amount of elastic strain energy is accumulating along this plate boundary (Harris 2011).…”

Section: Tectonic Settingmentioning

confidence: 99%

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Discovery of possible mega-thrust earthquake along the Seram Trough from records of 1629 tsunami in eastern Indonesian region

Liu

Harris

2013

Nat Hazards

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Arthur Wichmann's ''Earthquakes of the Indian Archipelago'' documents several large earthquakes and tsunami throughout the Banda Arc region that can be interpreted as mega-thrust events. However, the source regions of these events are not known. One of the largest and well-documented events in the catalog is the great earthquake and tsunami affecting the Banda Islands on August 1, 1629. It caused severe damage from a 15-m tsunami that arrived at the Banda Islands about a half hour after violent shaking stopped. The earthquake was also recorded 230 km away in Ambon, but no tsunami is mentioned. This event was followed by at least 9 years of uncommonly frequent seismic activity in the region that tapered off with time, which can be interpreted as aftershocks. The combination of these observations indicates that the earthquake was most likely a mega-thrust event. We use an inverse modeling approach to numerically reconstruct the tsunami, which constrains the likely location and magnitude of the 1629 earthquake. Only, linear numerical models are applied due to the low resolution of bathymetry in the Banda Islands and Ambon. Therefore, we apply various wave amplification factors (1.5-4) derived from simulations of recent, well-constrained tsunami to bracket the upper and lower limits of earthquake moment magnitudes for the event. 123Nat Hazards (2014) 72:1311-1328 DOI 10.1007 one earthquake [M w 8.0 is recorded instrumentally from the eastern Indonesia region although high rates of strain (50-80 mm/a) are measured across the Seram section of the Banda subduction zone. Enough strain has already accumulated since the last major historical event to produce an earthquake of similar size to the 1629 event. Due to the rapid population growth in coastal areas in this region, it is imperative that the most vulnerable coastal areas prepare accordingly.

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Section: Tectonic Settingmentioning

confidence: 99%

Section: Tectonic Settingmentioning

confidence: 99%

Discovery of possible mega-thrust earthquake along the Seram Trough from records of 1629 tsunami in eastern Indonesian region

Liu

Harris

2013

Nat Hazards

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“…1) is the product of complex collision between Eurasia, Australia, and the Pacific (Caroline and Philippine Sea plates) since the Late Oligocene (van Bemmelen, 1949;Hamilton, 1979;Bowin et al, 1980;Katili, 1989;Milsom et al, 2001;Hall, 2002Hall, , 2012Hinschberger et al, 2005;Harris, 2006;Nugroho et al, 2009;Villeneuve et al, 2010;Watkinson et al, 2012). Much of the convergence has been accommodated by northward subduction of the Indian Ocean along the Sunda Trench (Widiyantoro and van der Hilst, 1997), by left-lateral slip within the Sorong Fault Zone across northernmost New Guinea (Visser and Hermes, 1962;Pieters et al, 1983;Charlton, 1996), and by the complete subduction of the double-dipping Molucca Sea slab eastwards beneath Halmahera and westwards beneath Sulawesi (McCaffrey et al, 1980).…”

Section: Introductionmentioning

confidence: 99%

Extreme extension across Seram and Ambon, eastern Indonesia: evidence for Banda slab rollback

2013

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Abstract. The island of Seram, which lies in the northern part of the 180 • -curved Banda Arc, has previously been interpreted as a fold-and-thrust belt formed during arc-continent collision, which incorporates ophiolites intruded by granites thought to have been produced by anatexis within a metamorphic sole. However, new geological mapping and a re-examination of the field relations cause us to question this model. We instead propose that there is evidence for recent and rapid N-S extension that has caused the hightemperature exhumation of lherzolites beneath low-angle lithospheric detachment faults that induced high-temperature metamorphism and melting in overlying crustal rocks. These "Kobipoto Complex" migmatites include highly residual AlMg-rich garnet + cordierite + sillimanite + spinel + corundum granulites (exposed in the Kobipoto Mountains) which contain coexisting spinel + quartz, indicating that peak metamorphic temperatures likely approached 900 • C. Associated with these residual granulites are voluminous MioPliocene granitic diatexites, or "cordierite granites", which crop out on Ambon, western Seram, and in the Kobipoto Mountains and incorporate abundant schlieren of spineland sillimanite-bearing residuum. Quaternary "ambonites" (cordierite + garnet dacites) emplaced on Ambon were also evidently sourced from the Kobipoto Complex migmatites as demonstrated by granulite-inherited xenoliths. Exhumation of the hot peridotites and granulite-facies Kobipoto Complex migmatites to shallower structural levels caused greenschistto lower-amphibolite facies metapelites and amphibolites of the Tehoru Formation to be overprinted by sillimanite-grade metamorphism, migmatisation, and limited localised anatexis to form the Taunusa Complex. The extreme extension required to have driven Kobipoto Complex exhumation evidently occurred throughout Seram and along much of the northern Banda Arc. The lherzolites must have been juxtaposed against the crust at typical lithospheric mantle temperatures in order to account for such high-temperature metamorphism and therefore could not have been part of a cooled ophiolite. In central Seram, lenses of peridotites are incorporated with a major left-lateral strike-slip shear zone (the "Kawa Shear Zone"), demonstrating that strike-slip motions likely initiated shortly after the mantle had been partly exhumed by detachment faulting and that the main strike-slip faults may themselves be reactivated and steepened lowangle detachments. The geodynamic driver for mantle exhumation along the detachment faults and strike-slip faulting in central Seram is very likely the same; we interpret the extreme extension to be the result of eastward slab rollback into the Banda Embayment as outlined by the latest plate reconstructions for Banda Arc evolution.

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“…At Present, the Australian plate is moving N20 E at rates of~77 mm yr À1 ( Fig. 1; Tregoning et al, 1994;Nugroho et al, 2009;DeMets et al, 2010). It is colliding with the Banda Arc in the Timor Sea region (Fig.…”

Section: Arc-continent Collisionmentioning

confidence: 99%

Structural style in a young flexure-induced oblique extensional system, north-western Bonaparte Basin, Australia

Saqab

Bourget

2015

Journal of Structural Geology

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Plate boundary reorganization in the active Banda Arc–continent collision: Insights from new GPS measurements

Cited by 93 publications

References 33 publications

Discovery of possible mega-thrust earthquake along the Seram Trough from records of 1629 tsunami in eastern Indonesian region

Discovery of possible mega-thrust earthquake along the Seram Trough from records of 1629 tsunami in eastern Indonesian region

Extreme extension across Seram and Ambon, eastern Indonesia: evidence for Banda slab rollback

Structural style in a young flexure-induced oblique extensional system, north-western Bonaparte Basin, Australia

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