Narrow intermediate-depth seismogenic band related to flexural strain in relatively dry Peruvian flat slab
Abstract The distribution and rupture properties of intermediate-depth earthquakes (70–300 km) provide insights into the interior stress state of the subducting plate, its petrological composition, and the subduction history. Here we evaluate the kinematic spatio-temporal rupture evolutions of four...
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Nature Portfolio
2025-02-01
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| Series: | Communications Earth & Environment |
| Online Access: | https://doi.org/10.1038/s43247-025-02071-0 |
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| author | Lingci Zeng Lingling Ye Huajian Yao Wei Liu Daojun Si Thorne Lay Ting Yang |
| author_facet | Lingci Zeng Lingling Ye Huajian Yao Wei Liu Daojun Si Thorne Lay Ting Yang |
| author_sort | Lingci Zeng |
| collection | DOAJ |
| description | Abstract The distribution and rupture properties of intermediate-depth earthquakes (70–300 km) provide insights into the interior stress state of the subducting plate, its petrological composition, and the subduction history. Here we evaluate the kinematic spatio-temporal rupture evolutions of four M7+ intermediate-depth earthquakes beneath Peru between 1997 and 2021 using teleseismic waveforms, which reveal similar rupture behavior over a limited depth range within the flat-slab segment. The intermediate-depth seismogenic zone is confined within a narrow band ~20 km thick near the slab surface, as also found in Pampean and Mexican flat slabs, contrasting to the broader seismicity distributions in the adjacent normally-dipping segments. The elongated earthquake ruptures in flat slabs with few aftershocks and the narrow, sparse seismicity bands are attributed to flexure from along-dip slab steepening and limited dehydration reactions within relatively dry flat-slab segments. Conversely, the diffuse seismicity in adjacent normally-dipping segments is likely associated with more widespread dehydration reactions. |
| format | Article |
| id | doaj-art-0a33f99b99f04ad890a69a24b9dfc770 |
| institution | DOAJ |
| issn | 2662-4435 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Earth & Environment |
| spelling | doaj-art-0a33f99b99f04ad890a69a24b9dfc7702025-08-20T02:48:27ZengNature PortfolioCommunications Earth & Environment2662-44352025-02-016111410.1038/s43247-025-02071-0Narrow intermediate-depth seismogenic band related to flexural strain in relatively dry Peruvian flat slabLingci Zeng0Lingling Ye1Huajian Yao2Wei Liu3Daojun Si4Thorne Lay5Ting Yang6Laboratory of Seismology and Physics of Earth’s Interior, School of Earth and Space Sciences, University of Science and Technology of ChinaDepartment of Earth and Space Sciences, Southern University of Science and TechnologyLaboratory of Seismology and Physics of Earth’s Interior, School of Earth and Space Sciences, University of Science and Technology of ChinaDepartment of Earth and Space Sciences, Southern University of Science and TechnologyDepartment of Earth and Space Sciences, Southern University of Science and TechnologyDepartment of Earth and Planetary Sciences, University of California Santa CruzDepartment of Earth and Space Sciences, Southern University of Science and TechnologyAbstract The distribution and rupture properties of intermediate-depth earthquakes (70–300 km) provide insights into the interior stress state of the subducting plate, its petrological composition, and the subduction history. Here we evaluate the kinematic spatio-temporal rupture evolutions of four M7+ intermediate-depth earthquakes beneath Peru between 1997 and 2021 using teleseismic waveforms, which reveal similar rupture behavior over a limited depth range within the flat-slab segment. The intermediate-depth seismogenic zone is confined within a narrow band ~20 km thick near the slab surface, as also found in Pampean and Mexican flat slabs, contrasting to the broader seismicity distributions in the adjacent normally-dipping segments. The elongated earthquake ruptures in flat slabs with few aftershocks and the narrow, sparse seismicity bands are attributed to flexure from along-dip slab steepening and limited dehydration reactions within relatively dry flat-slab segments. Conversely, the diffuse seismicity in adjacent normally-dipping segments is likely associated with more widespread dehydration reactions.https://doi.org/10.1038/s43247-025-02071-0 |
| spellingShingle | Lingci Zeng Lingling Ye Huajian Yao Wei Liu Daojun Si Thorne Lay Ting Yang Narrow intermediate-depth seismogenic band related to flexural strain in relatively dry Peruvian flat slab Communications Earth & Environment |
| title | Narrow intermediate-depth seismogenic band related to flexural strain in relatively dry Peruvian flat slab |
| title_full | Narrow intermediate-depth seismogenic band related to flexural strain in relatively dry Peruvian flat slab |
| title_fullStr | Narrow intermediate-depth seismogenic band related to flexural strain in relatively dry Peruvian flat slab |
| title_full_unstemmed | Narrow intermediate-depth seismogenic band related to flexural strain in relatively dry Peruvian flat slab |
| title_short | Narrow intermediate-depth seismogenic band related to flexural strain in relatively dry Peruvian flat slab |
| title_sort | narrow intermediate depth seismogenic band related to flexural strain in relatively dry peruvian flat slab |
| url | https://doi.org/10.1038/s43247-025-02071-0 |
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