P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography
Chao Lake is a Geoheritage site on the active Tan-Lu Fault between the Yangtze craton, the North China craton, and the Dabie orogenic belt in the southeast. This segment of the fault is not well constrained at depth partly due to the overprinting of the fault zone by intrusive materials and its rela...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2022-12-01
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| Series: | Earthquake Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674451922003718 |
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| author | Bem Shadrach Terhemba Huajian Yao Song Luo Lei Gao Haijiang Zhang Junlun Li |
| author_facet | Bem Shadrach Terhemba Huajian Yao Song Luo Lei Gao Haijiang Zhang Junlun Li |
| author_sort | Bem Shadrach Terhemba |
| collection | DOAJ |
| description | Chao Lake is a Geoheritage site on the active Tan-Lu Fault between the Yangtze craton, the North China craton, and the Dabie orogenic belt in the southeast. This segment of the fault is not well constrained at depth partly due to the overprinting of the fault zone by intrusive materials and its relatively low seismic activity and sparse seismic station coverage. This study took advantage of a dense seismic array deployed around Chao Lake to delineate the P-wave velocity variations in the crust and uppermost mantle using teleseismic earthquake arrival time tomography. The station-pair double-difference with waveform cross-correlation technique was employed. We used a multiscale resolution 3-D initial model derived from the combination of high-resolution 3-D vS models within the region of interest to account for the lateral heterogeneity in the upper crust. The results revealed that the velocity of the upper crust is segmented with structures trending in the direction of the strike of the fault. Sedimentary basins are delineated on both sides of the fault with slow velocities, while the fault zone is characterized by high velocity in the crust and uppermost mantle. The high-velocity structure in the fault zone shows characteristics of magma intrusion that may be connected to the Mesozoic magmatism in and around the Middle and Lower Yangtze River Metallogenic Belt (MLYMB), implying that the Tan-Lu fault might have formed a channel for magma intrusion. Magmatic material in Chao Lake is likely connected to the partial melting, assimilation, storage, and homogenization of the uppermost mantle and the lower crustal rocks. The intrusions, however, seem to have suffered severe regional extension along the Tan-Lu fault driven by the eastward Paleo-Pacific plate subduction, thereby losing its deep trail due to extensional erosion. |
| first_indexed | 2024-04-10T16:06:37Z |
| format | Article |
| id | doaj.art-03522e40670d4bf7bf1ba0000d91e879 |
| institution | Directory Open Access Journal |
| issn | 1867-8777 |
| language | English |
| last_indexed | 2024-04-10T16:06:37Z |
| publishDate | 2022-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Earthquake Science |
| spelling | doaj.art-03522e40670d4bf7bf1ba0000d91e8792023-02-10T04:21:35ZengKeAi Communications Co., Ltd.Earthquake Science1867-87772022-12-01356427447P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomographyBem Shadrach Terhemba0Huajian Yao1Song Luo2Lei Gao3Haijiang Zhang4Junlun Li5Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; Department of Physics, Federal University Duste, Dutse, Jigawa State, NigeriaLaboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Mengcheng 233500, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei 230026, China; Corresponding author: Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China,Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, ChinaLaboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, ChinaLaboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Mengcheng 233500, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei 230026, ChinaLaboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Mengcheng 233500, ChinaChao Lake is a Geoheritage site on the active Tan-Lu Fault between the Yangtze craton, the North China craton, and the Dabie orogenic belt in the southeast. This segment of the fault is not well constrained at depth partly due to the overprinting of the fault zone by intrusive materials and its relatively low seismic activity and sparse seismic station coverage. This study took advantage of a dense seismic array deployed around Chao Lake to delineate the P-wave velocity variations in the crust and uppermost mantle using teleseismic earthquake arrival time tomography. The station-pair double-difference with waveform cross-correlation technique was employed. We used a multiscale resolution 3-D initial model derived from the combination of high-resolution 3-D vS models within the region of interest to account for the lateral heterogeneity in the upper crust. The results revealed that the velocity of the upper crust is segmented with structures trending in the direction of the strike of the fault. Sedimentary basins are delineated on both sides of the fault with slow velocities, while the fault zone is characterized by high velocity in the crust and uppermost mantle. The high-velocity structure in the fault zone shows characteristics of magma intrusion that may be connected to the Mesozoic magmatism in and around the Middle and Lower Yangtze River Metallogenic Belt (MLYMB), implying that the Tan-Lu fault might have formed a channel for magma intrusion. Magmatic material in Chao Lake is likely connected to the partial melting, assimilation, storage, and homogenization of the uppermost mantle and the lower crustal rocks. The intrusions, however, seem to have suffered severe regional extension along the Tan-Lu fault driven by the eastward Paleo-Pacific plate subduction, thereby losing its deep trail due to extensional erosion.http://www.sciencedirect.com/science/article/pii/S1674451922003718teleseismic arrival time tomographyvP velocity structurecrust and uppermost mantleTan-Lu FaultChao Lake |
| spellingShingle | Bem Shadrach Terhemba Huajian Yao Song Luo Lei Gao Haijiang Zhang Junlun Li P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography Earthquake Science teleseismic arrival time tomography vP velocity structure crust and uppermost mantle Tan-Lu Fault Chao Lake |
| title | P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography |
| title_full | P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography |
| title_fullStr | P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography |
| title_full_unstemmed | P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography |
| title_short | P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography |
| title_sort | p wave velocity structure in the crust and the uppermost mantle of chao lake region of the tan lu fault inferred from teleseismic arrival time tomography |
| topic | teleseismic arrival time tomography vP velocity structure crust and uppermost mantle Tan-Lu Fault Chao Lake |
| url | http://www.sciencedirect.com/science/article/pii/S1674451922003718 |
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