Stress variations in southern Tonga slab derived from deep-focus earthquakes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F24%3A00585722" target="_blank" >RIV/67985530:_____/24:00585722 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/24:10495381
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JB028039" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JB028039</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2023JB028039" target="_blank" >10.1029/2023JB028039</a>
Alternative languages
Result language
angličtina
Original language name
Stress variations in southern Tonga slab derived from deep-focus earthquakes
Original language description
Tonga is a convergent plate boundary between the Pacific and Australian plates and is the fastest and the most seismically active deep subduction system in the world. We focused on southern Tonga (south of latitude 22 degrees S) and the mantle transition zone (depths of 410-670 km), where seismic activity forms two subparallel bands of events in the east and west. We performed stress analysis by inverting focal mechanisms of earthquakes available in the Global Centroid Moment Tensor catalog and revealed two distinct stress regimes in the slab. While the stress orientation in the eastern slab segment conforms to the down-dip compressional stress along the entire slab, the stress orientation in the western slab segment is different, having the maximum compression in the vertical direction. This suggests that the western segment can represent a stagnant slab with flattening and bending, as proposed by modeling studies. Its connection with the younger actively subducting slab is supported by the horizontal westward shift at 520 km depth. The stress analysis also indicates substantially different fault orientations in both segments. In the actively dipping slab, the majority of activated faults are predominantly sub-horizontal. However, they are significantly inclined from vertical in the stagnant slab segment. A higher scatter in fault orientations in the stagnant slab suggests deformation, fragmentation and rheological complexity resulting from bending and flattening.
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
10507 - Volcanology
Result continuities
Project
<a href="/en/project/GA22-10747S" target="_blank" >GA22-10747S: Inversion of focal mechanisms and seismic moment tensors for stress and its spatiotemporal variation</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
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
129
Issue of the periodical within the volume
5
Country of publishing house
US - UNITED STATES
Number of pages
17
Pages from-to
e2023JB028039
UT code for WoS article
001209370200001
EID of the result in the Scopus database
2-s2.0-85191697584