Subsidence of the aru trough and the Aru Island, Irian Java, Indonesia

Untung, M.

doi:10.1016/0040-1951(85)90188-x

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…Numerous papers have described this area, including a seismic refraction profile [ Jacobson et al , 1979], seismic reflection profiles [ Bowin et al , 1980; Jongsma et al , 1989; Untung , 1985], gravity and heat flow data [ Bowin et al , 1980], geological studies of the Kai islands [ Charlton et al , 1991; Milsom et al , 1996], GPS data [ Bock et al , 2003] and seismicity [ Cardwell and Isacks , 1978; McCaffrey , 1988, 1989; McCaffrey et al , 1991]. The tectonic interpretation of the Aru Trough is controversial (see section 5.2).…”

Section: Geological Settingmentioning

confidence: 99%

“…However, as the horizontal resolution is only ∼300 km, variations correlated with surface features on the scale of ∼100 km, such as the Aru Trough, cannot be precise. The Aru Trough was formerly thought to mark the surface expression of the Australian‐Banda subduction zone [ Bowin et al , 1980; Untung , 1985; McCaffrey , 1988, 1989; Tandon et al , 2000]. However, field work has shown that the W Kai consists of high‐grade metamorphic rocks thrust over an imbricated cover sequence interpreted as an accretionary wedge whilst the E Kai islands consist of shallowly west‐dipping Eocene‐Pliocene sediments cut by NNE east‐dipping normal faults [ Charlton et al , 1991; Milsom et al , 1996].…”

Section: Geological Settingmentioning

confidence: 99%

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Upper‐mantle earthquakes beneath the Arafura Sea and south Aru Trough: Implications for continental rheology

Sloan

Jackson

2012

J. Geophys. Res.

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The extent and controls of long‐term elastic strength and seismicity in the upper continental lithospheric mantle (UCLM) are controversial topics in continental tectonics. One key issue is the scarcity of UCLM earthquakes, even where the UCLM is likely to be colder than 600°C. The rarity of these earthquakes could be because the UCLM generally relatively hydrous causing it to deform aseismically even when colder than 600°C, unless it is deforming at exceptionally high strain rates. Alternatively, the UCLM could be relatively anhydrous, and potentially seismogenic at temperatures below 600°C; in which case the rarity of UCLM earthquakes may be because areas where the UCLM is colder than 600°C have such a thick seismogenic layer, and such a cool mantle root, that they deform exceptionally slowly. The identification and study of UCLM earthquakes allows us to distinguish between these possibilities. Here we show that two earthquakes occurred in the UCLM beneath the epicontinental Arafura Sea. Both earthquakes occurred where the UCLM is probably cooler than 600°C and one of these earthquakes lies ∼25 km below the Moho in an region where there is no evidence of unusually high strain rates. There at least, it is probable that the UCLM is relatively anhydrous, and seismogenic at temperatures below 600°C. We also find evidence that regions where the UCLM is colder than 600°C also have a seismogenic lower crust. This results in a single, extremely strong layer comprising the entire crust and the UCLM down to the 600°C isotherm.

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