Show simple item record

dc.contributor.authorSingha, Pabitra
dc.contributor.authorDewangan, P.
dc.contributor.authorGhosal, D.
dc.contributor.authorKameshRaju, K.A.
dc.contributor.authorAswini, K.K.
dc.contributor.authorYatheesh, V.
dc.contributor.authorMukhopadhyay, R.
dc.contributor.authorMandal, Suman
dc.date.accessioned2023-09-23
dc.date.accessioned2023-09-08T12:20:39Z
dc.date.available2023-07-10
dc.date.available2023-09-08T12:20:39Z
dc.date.issued2023
dc.identifier.citationTectonophysics, vol.862; 2023; Article no: 229979
dc.identifier.issn0040-1951
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S0040195123002779
dc.identifier.urihttps://doi.org/10.1016/J.TECTO.2023.229979
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9101
dc.description2.9
dc.description.abstractAlcock and Sewell seamounts are important geomorphic features in the Andaman Sea due to their association with the tectonic history of the Sunda subduction zone. Despite the availability of global geophysical data, the nature of crust beneath these seamounts remains debated due to the paucity of local geophysical data. Therefore, a passive ocean bottom seismometer (OBS) experiment was conducted by deploying broadband OBSs in the Andaman region from 25th December 2013 to 10th May 2014. Based on the local earthquakes recorded by OBS, we attempted to analyse the waveforms of the events using the state-of-the-art transfer function, and estimated the crustal velocities beneath the Alcock seamount. The inferred P wave velocity increases from 5.7 km/s to 7.3 km/s at a depth of 9 km and from 7.3 km/s to 8.1 km/s at a depth of 15 km. We validated the upper velocity model using an active OBS record obtained from a concurrent multichannel seismic survey acquired onboard RV Samudra Ratnakar. Further, we carried out traveltime streamer tomography by downward continuing the shot gathers of MCS data and obtaining high-resolution velocity-depth models over two shallow ridges on the Alcock Seamount. Tomography-derived velocity-depth model matches with that estimated from the active and passive OBS records. The presence of high subsurface velocities beneath the Alcock Seamount suggests the occurrence of extensive volcanoclastic deposits, possibly formed as a result of the magmatic intrusion. Higher velocities for deep crustal layers suggest an oceanic or island arc crust beneath the Alcock Seamount, which has probably evolved due to backarc volcanism in the Andaman Sea
dc.languageen
dc.publisherElsevier
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleCrustal structure beneath the Alcock Seamount in the Andaman Sea
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record