Deep-Focus Earthquakes Under Northeast China-An Imprint of the Complex Tectonic History of Pacific Plate Subduction
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10508353" target="_blank" >RIV/00216208:11320/25:10508353 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=lEJIskgO2v" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=lEJIskgO2v</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2024JB030215" target="_blank" >10.1029/2024JB030215</a>
Alternative languages
Result language
angličtina
Original language name
Deep-Focus Earthquakes Under Northeast China-An Imprint of the Complex Tectonic History of Pacific Plate Subduction
Original language description
Deep-focus earthquakes and their association with metastable olivine wedges (MOWs) remain enigmatic. Here we perform a seismic-geodynamic analysis of the Pacific slab stagnant at the 660 km deep bottom of the mantle transition zone. All investigated deep earthquakes exhibit only minor (mostly implosive) isotropic components, yet exhibit strongly varying compensated-linear-vector-dipole components. For the largest studied earthquake (M W 6.9), we demonstrate a significant stress-drop heterogeneity on a subhorizontal fault and a spatial change in radiation efficiency. We interpret the earthquakes with an evolutionary numerical subduction model with realistic mineralogy and rheology, including non-uniform plate aging and subduction disruption due to the Izanagi-Pacific ridge sinking in the early Cenozoic. This process resulted in a present-day tomography-supported bent slab, preserving low temperatures (900-1000 K), which permits the metastable olivine presence. Further, we demonstrate that the potential MOW is also bent. The accompanying internal deformation controls the deep seismicity in the slab tip with apparent changes in seismic radiation efficiency and rupture speed across the modeled temperature gradients. From a broader perspective, the MOW contortion may contribute to deformational anisotropy in the shallow lower mantle. Our results underscore the importance of joint interpretations of the evolutionary subduction models and seismic source inversions.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10500 - Earth and related environmental sciences
Result continuities
Project
<a href="/en/project/LUAUS23233" target="_blank" >LUAUS23233: Dynamics of subducting slabs and origin of deep-focus earthquakes</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Geophysical Research: Solid Earth
ISSN
2169-9313
e-ISSN
2169-9356
Volume of the periodical
130
Issue of the periodical within the volume
9
Country of publishing house
US - UNITED STATES
Number of pages
18
Pages from-to
e2024JB030215
UT code for WoS article
001563634800001
EID of the result in the Scopus database
2-s2.0-105014880695