Pseudofaults and associated seamounts in the conjugate Arabian and Eastern Somali basins, NW Indian Ocean – New constraints from high-resolution satellite-derived gravity data

Sreejith, K. M.; Chaubey, A.K.; Mishra, Amiyakanta; Kumar, Shravan; Rajawat, A. S.

doi:10.1016/j.jseaes.2016.09.002

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…Correlation between the marine free-air gravity and the topography is supported by previous studies that investigated and compared the tectonic and geomorphological setting of the West Indian Ocean with gravity data. They reported that transferred crustal block bounded by inner pseudofault and failed spreading ridge is characterised by a gravity low, rugged basement and the crustal structure of the Seychelles (Davies and Francis, 1964;Sreejith et al 2016).…”

Section: Resultsmentioning

confidence: 99%

Satellite Altimetry and Gravimetry Data for Mapping Marine Geodetic and Geophysical Setting of the Seychelles and the Somali Sea, Indian Ocean

Lemenkova

Debeir

2022

Journal of Applied Engineering Sciences

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Evaluation of the representative cartographic techniques demonstrated that there are still considerable challenges facing the methods of marine geodetic, geophysical and bathymetric data visualisation. In an oceanic seafloor formation, the interaction between the geological structural elements and topographical relief can be analysed by advanced mapping. In present study, a correlation between geodesy, geophysics and topography has been examined including the following variables: geological structure, coastal topography and bathymetry, geophysical fields, free-air gravity anomalies and geoid undulation, sediment thickness, bathymetric patterns, and extension of the transform faults. The variables were visualised on the high-resolution raster grids using Generic Mapping Tools (GMT) scripting toolset. The study area is located in the Seychelles and the Somali Sea segment of the Indian Ocean. The data incorporates satellite-derived gravity grid, EGM-2008, geological structures, topography from GEBCO grid and GlobSed sediment thickness, processed by GMT scripts. The results demonstrated that western continental slope of Somalia is wide, gently declining to the seafloor at depths exceeding -5000 m. Kenya and Tanzania present a wide continental foot with depths ranging from -3500 to -5000 m. The Somali Sea basin shows low sedimentation lower than 500 m, while ridges and island chains have higher sediment influx (1,000-2,000 m). The Mozambique Channel has dominating values at 2,500-3,500 m. Higher values are noted near the Reunion and Mauritius islands until the Seychelles via the Mascarene Plateau (500-1,000 m) against the <500 m in the areas of the Mid-Indian Ridge, Carlsberg Ridge and open water.

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Section: Resultsmentioning

confidence: 99%

Satellite Altimetry and Gravimetry Data for Mapping Marine Geodetic and Geophysical Setting of the Seychelles and the Somali Sea, Indian Ocean

Lemenkova

Debeir

2022

Journal of Applied Engineering Sciences

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“…However, several studies indicate a potential association between PWs and seamounts, as they might originate from the same locations. Sreejith et al (2016) noticed a potential correlation between mapped seamounts from gravity data in the Arabian Sea and their neighboring PWs. Ridge jumps and propagation in the South Atlantic Ocean may also be related to the formation of seamounts (Brozena & White, 1990).…”

Section: Discussionmentioning

confidence: 98%

“…Sreejith et al. (2016) noticed a potential correlation between mapped seamounts from gravity data in the Arabian Sea and their neighboring PWs. Ridge jumps and propagation in the South Atlantic Ocean may also be related to the formation of seamounts (Brozena & White, 1990).…”

Section: Discussionmentioning

confidence: 99%

Zones of Weakness Within the Juan de Fuca Plate Mapped From the Integration of Multiple Geophysical Data and Their Relation to Observed Seismicity

Ashraf,

Filina

2023

Geochem Geophys Geosyst

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This study aims to explain the nonuniform earthquake pattern along the Cascadia Subduction Zone. In particular, we investigate the relationship between the tectonic features of the subducting oceanic Juan de Fuca slab and the onshore seismicity pattern. We have integrated multiple geophysical data sets toward three general objectives. The first study intends to study variations in physical properties along three 2‐dimensional models through regions of different seismicities that combine public gravity, magnetic, and seismic data sets. These models reveal multiple zones of decreased crustal density that we interpret as regions of weaker oceanic crust. The second objective is to delineate major tectonic features by performing spatial analysis of potential fields. The overall methodology comprises gravity and magnetic data filtering, followed by lineaments mapping and cross‐referencing interpretation with available seismic reflection data. This process allows delineating zones of crustal weakness by extrapolating outside our three 2‐D models. We also map multiple seamounts that appear to cluster along identified zones of weaker crust. Third, we investigate the relationship between the mapped tectonic elements, namely the zones of weak crust with accompanying seamounts, and the observed seismicity trends within the subducted slab. The alignment between those suggests that mapped weak crust zones and associated seamounts may have an influence on the overall subduction process. As more of these structures are heading toward the Washington portion of the margin than to the Oregon portion, more earthquakes are observed in the north than in the south.

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Evidence for off-ridge thermal interaction along the Carlsberg and Central Indian ridges and its tectonic significance

Sreenidhi,

Sreejith,

Radhakrishna

2024

Mar Geophys Res

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Pseudofaults and associated seamounts in the conjugate Arabian and Eastern Somali basins, NW Indian Ocean – New constraints from high-resolution satellite-derived gravity data

Cited by 10 publications

References 21 publications

Satellite Altimetry and Gravimetry Data for Mapping Marine Geodetic and Geophysical Setting of the Seychelles and the Somali Sea, Indian Ocean

Satellite Altimetry and Gravimetry Data for Mapping Marine Geodetic and Geophysical Setting of the Seychelles and the Somali Sea, Indian Ocean

Zones of Weakness Within the Juan de Fuca Plate Mapped From the Integration of Multiple Geophysical Data and Their Relation to Observed Seismicity

Evidence for off-ridge thermal interaction along the Carlsberg and Central Indian ridges and its tectonic significance

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