Crust and upper mantle structure beneath the Yellow Sea, the East China Sea, the <i>Japan</i> Sea, and the Philippine Sea

Corchete, V.

doi:10.1080/00206814.2022.2150900

Cited by 2 publications

(2 citation statements)

References 67 publications

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“…The KB is defined by the contour line of 3000 m isobath in Figure 1 [25]. This block is characterized by thin lithosphere (50-100 km thick), thick asthenosphere (100-200 km-thick) and a low seismic velocity belt located in the upper mantle [8,15]. The low-velocity belt is associated to the East Asian rifting system, which is evidenced by many geological and geophysical characteristics, e.g., anomalies in the lithospheric density distribution or temperature differences within the lithosphere (e. g., [6,7,26,27]).…”

Section: Geological Settingmentioning

confidence: 99%

“…Those complicated structures are related to the dynamic processes of deep earth occurred from Mesozoic (~150 Ma). This new model will complete the 3D S-wave velocity models performed by Corchete [8,15] for East Asia and West Pacific marginal seas. Consequently, this model joint to those determined by Corchete [8,15] will be a very important tool to understand the relationships between the surface tectonics and the deep earth's structures, and thus to understand the evolution of this region.…”

Section: Introductionmentioning

confidence: 98%

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3D S-Wave Velocity Model of the Crust and Upper Mantle beneath the Sea of Okhotsk and the Kamchatka Peninsula

Corchete

2022

Lithosphere

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A 3D S-wave velocity model (from 0 to 350 km depth) is determined for the region of the Sea of Okhotsk and the Kamchatka peninsula, through Rayleigh wave analysis applied to the traces of 278 earthquakes registered by 12 seismic stations, both located within (and nearby) of the study area. This model reveals the principal geological and tectonics features present in the study area, e.g., the presence of two lower-crust hot plumes located at the northwest of the Sea of Okhotsk, which are shown as two zones of low S-wave velocity (from 20 to 30 km depth). Also, a conspicuous low S-wave velocity zone is determined at the southwest of the Sea of Okhotsk (from 35 to 60 km depth), which can be matched up with a high conductivity layer previously determined from 30 to 65 km depth. For the Kamchatka peninsula, low S-velocities are determined beneath the volcanic belt from the upper crust (~5 km-depth) down to a depth of ~60 for the southern part, and down to a depth of ~140 km for the northern part. This low S-wave velocity pattern is enlarged in size at the northwest (north of ~55°N), following the location of the Kliuchevskoi and Sheveluch volcanoes, which confirms that these volcanoes must be a part of the same subduction-induced volcanic process. The present model shows that the subducting Pacific slab terminates near to the Aleutian-Kamchatka junction, i.e., no relict slab underlies the extinct northern Kamchatka volcanic arc. This model shows that this slab shoals towards north, and there exists a gap associated with the loss of this slab beneath Sheveluch and Kliuchevskoi volcanoes. The low S-wave velocity pattern determined at northwest of the slab edge confirms the presence of the asthenospheric flow, which would pass through this gap to the northwest around the north slab edge. Finally, the present model shows the precise location and detailed structure of the asthenosphere, which is a new result that has not been determined in other previous studies.

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Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

3D S-Wave Velocity Model of the Crust and Upper Mantle beneath the Sea of Okhotsk and the Kamchatka Peninsula

Corchete

2022

Lithosphere

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Crustal density structure investigation of the East China Sea and adjacent regions using wavenumber domain 3D density imaging method

He,

Sun,

Fang

et al. 2024

Earth Planets Space

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The East China Sea, situated at the intersection of the Eurasian, Philippine Sea, and Pacific plates, is characterized by complex geology influenced by tectonic phenomena such as plate movements, volcanism, faults, and uplifts. Crustal density structure inversion provides a thorough understanding of the region's geological history as well as Earth's dynamical evolution, providing critical insights into seismic disaster mitigation, resource exploration, marine environmental protection, and maritime safety. The inversion process, on the other hand, presents challenges in data quality, quantity, model complexity, uncertainty, and computational resources. With the advancement of next-generation satellite gravity measurements and developing inversion techniques, the inversion of marine crustal density structures promises to be more precise and comprehensive. We explored the density distribution in the East China Sea and surrounding areas using an innovative wavenumber domain three-dimensional density imaging method along with high-precision global satellite gravity data. By overcoming data quality and computing resource constraints, wavenumber domain three-dimensional density imaging has transformed the discipline of marine geophysics, successfully delivering accurate density distributions in the study area. We were able to get a more precise and comprehensive characterization of the crustal density structure by combining high-precision satellite gravity data and cutting-edge imaging methods. Our investigation has unveiled previously unknown details about density distribution in the East China Sea and its environs. The East China Sea shelf displays smooth low-density perturbations at 18 km depth, whereas the trench–arc–basin region exhibits increasing density perturbations. Notably, the Okinawa Trough, which is surrounded by the Tokara Volcanic Ridge and the Ryukyu Trench, displays strong positive anomalies with a north–northeastern to northeastern orientation. In contrast, the Ryukyu Ridge and the Philippine Sea Basin exhibit smaller negative values and substantial northwestward positive density trends, respectively. These findings indicate diverse material distribution, which provides important insights into the area’s geological evolution and tectonic processes. This study adds new insights into density distribution in the East China Sea and adjacent regions, offering information on the geological complexity of the region. The research lays the groundwork for future research on crustal dynamics and enhances the field of marine geophysics and related disciplines. Graphical abstract

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Crust and upper mantle structure beneath the Yellow Sea, the East China Sea, the Japan Sea, and the Philippine Sea

Cited by 2 publications

References 67 publications

3D S-Wave Velocity Model of the Crust and Upper Mantle beneath the Sea of Okhotsk and the Kamchatka Peninsula

3D S-Wave Velocity Model of the Crust and Upper Mantle beneath the Sea of Okhotsk and the Kamchatka Peninsula

Crustal density structure investigation of the East China Sea and adjacent regions using wavenumber domain 3D density imaging method

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