Reflection imaging of the crust and the lithospheric mantle in the Lützow-Holm complex, Eastern Dronning Maud Land, Antarctica, derived from the SEAL transects

Kanao, Masaki; Fujiwara, Akira; Miyamachi, Hiroki; Toda, Shigeru; Itō, Kiyoshi; Tomura, M.; Ikawa, Takeshi

doi:10.1016/j.tecto.2010.08.005

Cited by 25 publications

(14 citation statements)

References 28 publications

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“…The two back azimuth groups are almost parallel with the coast of LHB and may indicate the relationship with the break-up process of Gondwana super-continent. The evidence of break-up supported by other studies from teleseismic shear wave anisotropy and reflection imaging by active source surveys [24].…”

Section: Velocity Discontinuities In the Upper Mantlesupporting

confidence: 76%

Passive Seismic Deployments from the Lützow-Holm Bay to Inland Plateau of East Antarctica: The Japanese IPY Contribution to Structure and Seismicity

Kanao¹,

Yamada²,

Toyokuni³

2013

IJG

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Deployments of seismic stations in Antarctica are an ambitious project to improve the spatial resolution of the Antarctic Plate and surrounding regions. Several international programs had been conducted in wide area of the Antarctic continent during the International Polar Year (IPY 2007(IPY -2008. The "Antarctica's GAmburtsev Province (AGAP)", the "GAmburtsev Mountain SEISmic experiment (GAMSEIS)" as a part of AGAP, and the "Polar Earth Observing Network (POLENET)" were major contributions to the IPY. The AGAP/GAMSEIS was an internationally coordinated deployments of more than few tens of broadband seismographs over the wide area of East Antarctica. Detailed information on crustal thickness and mantle structure provides key constraints on an origin of the Gamburtsev Mountains; and more broad structure and evolution of the East Antarctic craton and sub-glacial environment. From POLENET data obtained, local and regional signals associated with ice movements were recorded together with a significant number of teleseismic events. Moreover, seismic deployments have been carried out in the Lützow-Holm Bay (LHB), East Antarctica, by Japanese activities. The recorded teleseismic and local events are of sufficient quality to image the structure and dynamics of the crust and mantle, such as the studies by receiver functions suggesting a heterogeneous upper mantle. In addition to studies on the shallow part of the Earth, we place emphasis on these seismic deployments' ability to image the Earth's deep interior, as viewed from Antarctica, as a large aperture array in the southern high latitude.

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Section: Velocity Discontinuities In the Upper Mantlesupporting

confidence: 76%

Passive Seismic Deployments from the Lützow-Holm Bay to Inland Plateau of East Antarctica: The Japanese IPY Contribution to Structure and Seismicity

Kanao¹,

Yamada²,

Toyokuni³

2013

IJG

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“…The best horizontal Moho resolution is typically inferred from reflection profiles [82], but such a technique is expensive, thus not widely used. The Moho detection from a two-way travel time might also be affected by a weak reflectivity.…”

Section: Accuracy Assessmentmentioning

confidence: 99%

Combined Gravimetric-Seismic Moho Model of Tibet

2018

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Substantial progress has been achieved over the last four decades to better understand a deep structure in the Himalayas and Tibet. Nevertheless, the remoteness of this part of the world still considerably limits the use of seismic data. A possible way to overcome this practical restriction partially is to use products from the Earth’s satellite observation systems. Global topographic data are provided by the Shuttle Radar Topography Mission (SRTM). Global gravitational models have been derived from observables delivered by the gravity-dedicated satellite missions, such as the Gravity Recovery and Climate Experiment (GRACE) and the Gravity field and steady-state Ocean Circulation Explorer (GOCE). Optimally, the topographic and gravity data should be combined with available results from tomographic surveys to interpret the lithospheric structure, including also a Moho relief. In this study, we use seismic, gravity, and topographic data to estimate the Moho depth under orogenic structures of the Himalayas and Tibet. The combined Moho model is computed based on solving the Vening Meinesz–Moritz (VMM) inverse problem of isostasy, while incorporating seismic data to constrain the gravimetric solution. The result of the combined gravimetric-seismic data analysis exhibits an anticipated more detailed structure of the Moho geometry when compared to the solution obtained merely from seismic data. This is especially evident over regions with sparse seismic data coverage. The newly-determined combined Moho model of Tibet shows a typical contrast between a thick crustal structure of orogenic formations compared to a thinner crust of continental basins. The Moho depth under most of the Himalayas and the Tibetan Plateau is typically within 60–70 km. The maximum Moho deepening of ~76 km occurs to the south of the Bangong-Nujiang suture under the Lhasa terrane. Local maxima of the Moho depth to ~74 km are also found beneath Taksha at the Karakoram fault. This Moho pattern generally agrees with the findings from existing gravimetric and seismic studies, but some inconsistencies are also identified and discussed in this study.

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“…The present structure is attributed to hold the past regional tectonics, particularly metamorphic and orogenic activities in Pan-African age. Inferred thrust duplicated (similar to the wedge shaped) lower crust-upper mantle transition structures interpreted on the SEAL-2002 profile (Figure 12(b), [17]) also imply a compressive stress regime along the profile oriented in an NE-SW direction during the Pan-African. Through consideration with geophysical and lithologic information, LHB is considered to be formed under convergence, perpendicular to the thermal axis, during the collision between supraterrains of Gondwana during the last stage of supercontinent formation [39,47].…”

Section: Discussionmentioning

confidence: 64%

“…The deployments required significant logistical efforts, including the explosion of large dynamite shots along the seismic profiles on the ice sheet plateau in LHB. Sophisticated DSS processing demonstrated pronounced reflection images of the crust-upper mantle boundary (Moho discontinuity) and of the lithospheric mantle structure [17,38]. A laminated layering around the crust-mantle boundary was well imaged using coherency enhancement processing after the Normal Move Out (NMO) corrections applied to far-offset data of the SEAL-2000, -2002 profiles.…”

Section: Seismic Reflection Imagingmentioning

confidence: 99%

Broadband Seismic Deployments for Imaging the Upper Mantle Structure in the Lützow-Holm Bay Region, East Antarctica

Kanao

Usui

Inoue

et al. 2011

International Journal of Geophysics

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Broadband seismic deployments have been carried out in the Lützow-Holm Bay region (LHB), Dronning Maud Land, East Antarctica. The recorded teleseismic and local events are of sufficient quality to image the structure and dynamics of the crust and mantle of the terrain. Passive seismic studies by receiver functions and shear wave splitting suggest a heterogeneous upper mantle. Depth variations in topography for upper mantle discontinuities were derived from long period receiver function, indicating a shallow depth discontinuity at 660 km beneath the continental area of LHB. These results provide evidence of paleo upwelling of the mantle plume associated with Gondwana break-up. SKS splitting analysis anticipated a relationship between “fossil” anisotropy in lithospheric mantle and past tectonics. Moreover, active source surveys (DSSs) imaged lithospheric mantle reflections involving regional tectonic stress during Pan-African and succeeding extension regime at the break-up. By combining the active and passive source studies of the mantle structure, we propose an evolution model of LHB for constructing the present mantle structure.

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Reflection imaging of the crust and the lithospheric mantle in the Lützow-Holm complex, Eastern Dronning Maud Land, Antarctica, derived from the SEAL transects

Cited by 25 publications

References 28 publications

Passive Seismic Deployments from the Lützow-Holm Bay to Inland Plateau of East Antarctica: The Japanese IPY Contribution to Structure and Seismicity

Passive Seismic Deployments from the Lützow-Holm Bay to Inland Plateau of East Antarctica: The Japanese IPY Contribution to Structure and Seismicity

Combined Gravimetric-Seismic Moho Model of Tibet

Broadband Seismic Deployments for Imaging the Upper Mantle Structure in the Lützow-Holm Bay Region, East Antarctica

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Reflection imaging of the crust and the lithospheric mantle in the Lützow-Holm complex, Eastern Dronning Maud Land, Antarctica, derived from the SEAL transects

Cited by 25 publications

References 28 publications

Passive Seismic Deployments from the L&#252;tzow-Holm Bay to Inland Plateau of East Antarctica: The Japanese IPY Contribution to Structure and Seismicity

Passive Seismic Deployments from the L&#252;tzow-Holm Bay to Inland Plateau of East Antarctica: The Japanese IPY Contribution to Structure and Seismicity

Combined Gravimetric-Seismic Moho Model of Tibet

Broadband Seismic Deployments for Imaging the Upper Mantle Structure in the Lützow-Holm Bay Region, East Antarctica

Contact Info

Product

Resources

About

Passive Seismic Deployments from the Lützow-Holm Bay to Inland Plateau of East Antarctica: The Japanese IPY Contribution to Structure and Seismicity

Passive Seismic Deployments from the Lützow-Holm Bay to Inland Plateau of East Antarctica: The Japanese IPY Contribution to Structure and Seismicity