Crustal structure of the Murray Ridge, northwest Indian Ocean, from wide-angle seismic data

Minshull, T. A.; Edwards, R. A.; Flueh, Ernst R.

doi:10.1093/gji/ggv162

Cited by 11 publications

(6 citation statements)

References 37 publications

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“…1). The crustal block structure of the Murray Ridge reaches depths of −2,000 m (Minshull et al 2015). The Murray Ridge and Owen Fracture Zone separate the local basin of the small Gulf of Oman with rather flat seafloor at depths of about −3,300 m. The western part of the Arabian Sea has a shallow shelf stretching along the coasts of the Arabian Peninsula, Iran and Pakistan, with depths below 80-100 m. The surface of the shelf along the coasts of Oman and Saudi Arabia is complicated by numerous coral reefs.…”

Section: Fig 2 Geological and Seismic Map Of The Arabian Sea Basinmentioning

confidence: 99%

Relationship between geomorphology of the ocean seafloor with the tectonic structure of the Earth's crust and anomalous geophysical fields: Makran Trench, Arabian Sea

Lemenkova¹

2021

geol

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This study examined the relationships between topographic structure and submarine geomorphology, sediment thickness, geophysical anomaly fields, geological settings and tectonic lineament stretching of the Arabian Sea region, Carlsberg Ridge morphology, Makran Trench depths by GMT. The study included spatial analysis of the high-resolution datasets (GEBCO, EGM96, GlobSed) and geomorphological modeling of the 300km-width cross-section profiles of the Makran Trench. The analysis shown correlation between complex geologic and tectonic structure, asymmetric geomorphology and geophysical anomaly fields. The Makran Trench is formed in the subduction zone of the Arabian and Eurasian plates at the basement of the continental margin of Pakistan. Submarine geomorphic structure of the Arabian Sea is complicated by the Carlsberg Ridge, Owen Fracture Zone, Aden-Owen- Carlsberg Triple junction, numerous faults and rifts. The geophysical fields of the marine free- air gravity correlate with distribution of these geomorphic structures. Bathymetric analysis of the trench revealed the most frequent depth (448 samples) at -3,250 to -3,500 m, following by intervals: -3,000 to -3,250 m (225 samples), -2,750 to -3,000 m (201 samples). Gently declining continental slope of the coastal elevations correlate with gradually decreasing depths, as equally distributed bins: 124 samples (-2,500 to -2,750 m), 96 (-2,250 to -2,500 m), 86 (-2,000 to -2,250 m). Makran Trench has asymmetric geomorphology with a high slope steepness on the continental slope of Pakistan and low steepness with flat valley on the oceanward side.

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Section: Fig 2 Geological and Seismic Map Of The Arabian Sea Basinmentioning

confidence: 99%

Relationship between geomorphology of the ocean seafloor with the tectonic structure of the Earth's crust and anomalous geophysical fields: Makran Trench, Arabian Sea

Lemenkova¹

2021

geol

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“…Peridotites dredged at the Murray Ridge-Dalrymple Trough reveal a supra-subduction signature [Burgath et al, 2002]. The area of the Dalrymple Trough and the Murray Ridge consists in a thinned continental lithosphere [Minshull et al, 2015], commonly attached to the segment of the Indian margin formed during the Late Jurassic-Early Cretaceous opening of the Western Somali Basin [Calv ès et al, 2011, Minshull et al, 2015. In this configuration, the supra-subduction signature of the peridotites dredged at Murray Ridge records the NE dip of the subduction.…”

Section: Reconstructions Of Nw India Margins During the Late Cretaceomentioning

confidence: 99%

The Amirante Ridge and Trench System in the Indian Ocean: the southern termination of the NW Indian subduction

Rodriguez¹

2020

Comptes Rendus. Géoscience

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“…The Geodetic and GPS constraints provide some controls to understand the development of stresses in the faulty blocks of the southern Pakistan, particularly, Makran region (Altamimi et al, 2012; Frohling and Szeliga, 2016). The global and regional plate assemblages in southern Pakistan and southeastern Iran, geodetic constraints and earthquake focal mechanisms suggested the ongoing oblique extension at Murray ridge with a rate of ~ 3.1 ± 0.7 to 3.7± 0.7 mm/yr at southern part, however, to its northern part the Owen Fracture Zone exhibit the dextral strike -slip motion at a rate of 2-4 mm/yr along the Murray ridge (Minshull et al, 2015). An integrated study of GPS measurements (from 20 stations located in southern Iran, southwestern Pakistan and Oman) coupled with hypocentral depths expound the Makran subduction zone accumulating strain at a rate of between 17.1 −3.5 +4.1 mm/yr (Frohling and Szeliga, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…These seismotectonic features are primitive source of neotectonic deformation and active seismic events (Pararas-Carayannis, 2006; Martin and Kakar, 2012). The dearth of fixed GPS stations, advanced earthquake instrumentation, broad coverage of geophysical imaging, integration of allied datasets, detailed geophysical and rheological findings about brittle lithosphere and beyond it which preclude critical analysis and look-down into dynamic interior (Szeliga et al, 2012;Minshull et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Modelling of Seismicity in Southern Pakistan using GIS Techniques

Khan¹

2020

Preprint

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This study was aimed to expound spatial association between tectonic earthquakes and individual faults in southern Pakistan. A population of fault lines are exposed to the onshore region located to the north of active Makran subduction zone and within Indus Basin where geophysical prospecting reported neotectonic deformation and faulting. A catalog of earthquakes has been compiled considering the seismic events originated from southern Pakistan and neighboring southeastern Iran, southern Afghanistan and frontal offshore areas. Since, the faulty blocks are extending beyond the international borders, a wide region was outlined for cataloging and thorough screening of fault lines. The catalog has been thoroughly processed by standard procedures necessary for magnitude coherency, main shocks decluttering, magnitude completeness and removal of spatially outlier events etc. GIS-based vectors of fault lines were abstracted by the digitization of regional tectonic lineaments and structural maps. A rigorous effort was made to review available literature to gather updated data of plate kinematics, GPS constraints, relative blocks movement across the faults and rate of fault mechanics (slip-sense) during major events. The weights of evidence method was used to judge the spatial associations between seismic events and populations of faults lines to ascribe ‘seismicity index’ which ranked the potential faults from I (least active level) to V (highly active level). The SI helped to compare each fault response e.g. seismicity yield, released seismic stresses collinear to the fault line, active or aseismic segments and probabilistic estimate for future sizeable earthquake. Kernel density maps were prepared to allure the vulnerable pockets of the elongated faults for specific magnitude windows. The spatial patterns of earthquakes in southern Pakistan were significant to study the seismogenic potential associated with the active tectonic lineaments and faulted blocks. Spatial analysis of data sets for seismic events suggest stronger spatial associations between earthquake epicenters and faults oriented N-S, and weaker spatial associations of epicenters with some -unknown faults in the plains of Indus Basin.

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Crustal structure of the Murray Ridge, northwest Indian Ocean, from wide-angle seismic data

Cited by 11 publications

References 37 publications

Relationship between geomorphology of the ocean seafloor with the tectonic structure of the Earth's crust and anomalous geophysical fields: Makran Trench, Arabian Sea

Relationship between geomorphology of the ocean seafloor with the tectonic structure of the Earth's crust and anomalous geophysical fields: Makran Trench, Arabian Sea

The Amirante Ridge and Trench System in the Indian Ocean: the southern termination of the NW Indian subduction

Modelling of Seismicity in Southern Pakistan using GIS Techniques

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