Seismic Structure of the Upper Mantle Beneath Eastern Asia From Full Waveform Seismic Tomography
Abstract To better understand the subsurface behavior of subducting slabs and their relation to the tectonic evolution of the overriding plate, we conduct a full waveform inversion on a large data set to determine a high‐resolution seismic model, FWEA18 (Full Waveform inversion of East Asia in 2018)...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2018-08-01
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| Series: | Geochemistry, Geophysics, Geosystems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2018GC007460 |
| _version_ | 1797351796712144896 |
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| author | Kai Tao Stephen P. Grand Fenglin Niu |
| author_facet | Kai Tao Stephen P. Grand Fenglin Niu |
| author_sort | Kai Tao |
| collection | DOAJ |
| description | Abstract To better understand the subsurface behavior of subducting slabs and their relation to the tectonic evolution of the overriding plate, we conduct a full waveform inversion on a large data set to determine a high‐resolution seismic model, FWEA18 (Full Waveform inversion of East Asia in 2018), of the upper mantle beneath eastern Asia. FWEA18 reveals sharper, more intense high‐velocity slabs in the upper mantle under the southern Kuril, Japan, and Ryukyu arcs, than previous studies have found. The subducting Pacific plate is imaged as a roughly 100 km thick high‐velocity slab to near 550 km depth indicating relatively little deformation. Stagnation near 600 km depth is observed over horizontal distances of 600 km or less. The Pacific plate we image accounts for roughly 25 Myr of subduction with older slab likely located in the lower mantle. The Philippine plate, subducting beneath the Ryukyu Islands, has a clear termination at about 450 km depth. This may indicate a tearing event in the past or that less Philippine Sea plate has subducted than previously thought. We found a double‐layer high‐velocity anomaly above and below 660 km under the Yellow Sea and eastern coast of North China. This may correspond to parts of the Philippine Sea plate that detached in the past and Pacific plate that have intersected at depth or a complicated behavior of the Pacific plate at that depth. Slow cylindrical anomalies cross the entire upper mantle are imaged beneath major Holocene volcanoes, which are likely upwellings associated with the edges of deep slabs that are entering the lower mantle. |
| first_indexed | 2024-03-08T13:05:41Z |
| format | Article |
| id | doaj.art-db2a0f5f58fb4ef5b6de170c0f0877c1 |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-03-08T13:05:41Z |
| publishDate | 2018-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-db2a0f5f58fb4ef5b6de170c0f0877c12024-01-18T19:36:25ZengWileyGeochemistry, Geophysics, Geosystems1525-20272018-08-011982732276310.1029/2018GC007460Seismic Structure of the Upper Mantle Beneath Eastern Asia From Full Waveform Seismic TomographyKai Tao0Stephen P. Grand1Fenglin Niu2State Key Laboratory of Petroleum Resource and Prospecting and Unconventional Natural Gas Institute, China University of Petroleum at Beijing Beijing ChinaDepartment of Geological Sciences University of Texas at Austin Austin TX USAState Key Laboratory of Petroleum Resource and Prospecting and Unconventional Natural Gas Institute, China University of Petroleum at Beijing Beijing ChinaAbstract To better understand the subsurface behavior of subducting slabs and their relation to the tectonic evolution of the overriding plate, we conduct a full waveform inversion on a large data set to determine a high‐resolution seismic model, FWEA18 (Full Waveform inversion of East Asia in 2018), of the upper mantle beneath eastern Asia. FWEA18 reveals sharper, more intense high‐velocity slabs in the upper mantle under the southern Kuril, Japan, and Ryukyu arcs, than previous studies have found. The subducting Pacific plate is imaged as a roughly 100 km thick high‐velocity slab to near 550 km depth indicating relatively little deformation. Stagnation near 600 km depth is observed over horizontal distances of 600 km or less. The Pacific plate we image accounts for roughly 25 Myr of subduction with older slab likely located in the lower mantle. The Philippine plate, subducting beneath the Ryukyu Islands, has a clear termination at about 450 km depth. This may indicate a tearing event in the past or that less Philippine Sea plate has subducted than previously thought. We found a double‐layer high‐velocity anomaly above and below 660 km under the Yellow Sea and eastern coast of North China. This may correspond to parts of the Philippine Sea plate that detached in the past and Pacific plate that have intersected at depth or a complicated behavior of the Pacific plate at that depth. Slow cylindrical anomalies cross the entire upper mantle are imaged beneath major Holocene volcanoes, which are likely upwellings associated with the edges of deep slabs that are entering the lower mantle.https://doi.org/10.1029/2018GC007460seismic tomographyfull waveform inversioncomputational seismologyEast Asia |
| spellingShingle | Kai Tao Stephen P. Grand Fenglin Niu Seismic Structure of the Upper Mantle Beneath Eastern Asia From Full Waveform Seismic Tomography Geochemistry, Geophysics, Geosystems seismic tomography full waveform inversion computational seismology East Asia |
| title | Seismic Structure of the Upper Mantle Beneath Eastern Asia From Full Waveform Seismic Tomography |
| title_full | Seismic Structure of the Upper Mantle Beneath Eastern Asia From Full Waveform Seismic Tomography |
| title_fullStr | Seismic Structure of the Upper Mantle Beneath Eastern Asia From Full Waveform Seismic Tomography |
| title_full_unstemmed | Seismic Structure of the Upper Mantle Beneath Eastern Asia From Full Waveform Seismic Tomography |
| title_short | Seismic Structure of the Upper Mantle Beneath Eastern Asia From Full Waveform Seismic Tomography |
| title_sort | seismic structure of the upper mantle beneath eastern asia from full waveform seismic tomography |
| topic | seismic tomography full waveform inversion computational seismology East Asia |
| url | https://doi.org/10.1029/2018GC007460 |
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