Structural styles and tectonic evolution of the Seram Trough, Indonesia

Pairault, Angelique A.; Hall, Robert; Elders, Chris

doi:10.1016/j.marpetgeo.2003.10.001

Cited by 44 publications

(41 citation statements)

References 24 publications

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“…However, seismic reflection profiles across the deformation front at the Seram, Tanimbar and Timor Troughs show thrust faults breaking all of the way to the surface (Schluter and Fritsch 1985;Karig et al 1987;Pairault et al 2003). We interpret the low seismic slip rates of the Banda collision zone as evidence of a locked plate boundary interface, which potentially could produce mega-thrust earthquakes.…”

Section: Tectonic Settingmentioning

confidence: 80%

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: 80%

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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“…At the western side of the zone of extension Sulawesi was emergent and at the eastern side the northern part of the Bird's Head was an elevated region shedding clastic sediment to the southwest. South of the present southern coast of the Bird's Head was a broad region which remained marine, but recent work shows that even within this marine area there was a short-lived period of deformation and uplift at about 4 Ma leading to erosion and subaerial karstic topography (Pairault et al 2003). Subsequently this area subsided again and remained submerged, with the exception of Misool, until the present.…”

Section: Palaeogeographymentioning

confidence: 98%

Southeast Asia's changing palaeogeography

Hall¹

2009

blum - j plant tax and plant geog

378

482

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Geology provides the basis for understanding distributions of faunas and floras in Southeast Asia but only via a complex interplay of plate movements, palaeogeography, ocean circulation and climate. Southeast Asia grew incrementally by the addition of continental fragments, mainly rifted from Australia, and added to the margins of Sundaland as a result of subduction. Sundaland was an almost permanent land area from the beginning of the Mesozoic. The addition of the continental fragments of Southwest Borneo and later East Java -West Sulawesi formed a much larger emergent land area by the Late Cretaceous that extended from Indochina to West Sulawesi. Subduction resumed at the Sundaland margin in the Eocene and this led to widespread rifting within Sundaland, and formed one of the most important barriers at its edge, the Makassar Straits. Australia began to collide with Southeast Asia about 25 million years ago, effectively closing the former deep ocean separating the two continents, and forming the region now known as Wallacea. Collision, volcanism, and subduction-related processes have led to rise of mountains but also formed new oceans within this complex region. Plate tectonic movements and collisions were intimately linked to changing topography, bathymetry and land/sea distributions which have in turn influenced oceanic circulation and climate. As the deep-water barrier between Australia and Southeast Asia was eliminated and mountains rose, deep marine basins also formed. Eustatic changes in sea level further contributed to a complex palaeogeography. The present gateway between the Pacific and Indian Oceans is the only low latitude oceanic passage between the world's oceans, and is an important influence on local and probably global climate. The gateway is likely to have been just as significant in the past. Understanding the geology, then palaeogeography, and then their oceanic and climatic consequences are vital steps on the way to interpreting present distributions of plants and animals.

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“…The non-volcanic outer arc is widely regarded as a recent zone of collision between the Australian margin and Banda volcanic arc and includes thrust sheets, especially of the Australian sedimentary rocks, but is related to places with some igneous and metamorphic rocks, which have been elevated above the sea level very rapidly since the Middle Pliocene [14,15].…”

Section: Geologic Settingsmentioning

confidence: 99%

The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

et al. 2017

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Abstract:In early 2017, the geothermal system in the Suli and Tulehu areas of Ambon (Indonesia) was investigated using a gravity gradient tensor and analytic signal. The gravity gradient tensor and analytic signal were obtained through forward modeling based on a rectangular prism. It was applied to complete Bouguer anomaly data over the study area by using Fast Fourier Transform (FFT). The analysis was conducted to enhance the geological structure like faults as a pathway of geothermal fluid circulation that is not visible on the surface because it is covered by sediment. The complete Bouguer anomaly ranges of 93 mGal up to 105 mGal decrease from the southwest in Suli to the northeast in Tulehu. A high gravity anomaly indicates a strong magmatic intrusion below the Suli region. The gravity anomalies decrease occurs in the Eriwakang mountain and most of Tulehu, and it is associated with a coral limestone. The lower gravity anomalies are located in the north to the northeast part of Tulehu are associated with alluvium. The residual anomaly shows that the drill well TLU-01 and geothermal manifestations along with the Banda, and Banda-Hatuasa faults are associated with lowest gravity anomaly (negative zone). The gravity gradient tensor simulation and an analytic signal of Suli and Tulehu give more detailed information about the geological features. The g zz component allows accurate description of the shape structures, especially the Banda fault associated with a zero value. This result will be useful as a geophysical constraint to subsurface modeling according to gravity gradient inversion over the area.

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Structural styles and tectonic evolution of the Seram Trough, Indonesia

Cited by 44 publications

References 24 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

Southeast Asia's changing palaeogeography

The Study of Geological Structures in Suli and Tulehu Geothermal Regions (Ambon, Indonesia) Based on Gravity Gradient Tensor Data Simulation and Analytic Signal

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