Variations in the slope of the earthquakes recurrence curve in the tonga subduction zone in 2005–2022
- Authors: Shakirova A.A.1, Saltykov V.A.1
-
Affiliations:
- Kamchatka Branch of the Geophysical Survey of Russian Academy of Sciences
- Issue: No 4 (2024)
- Pages: 40-53
- Section: Articles
- URL: https://bakhtiniada.ru/0203-0306/article/view/273403
- DOI: https://doi.org/10.31857/S0203030624040038
- EDN: https://elibrary.ru/IYBDFF
- ID: 273403
Cite item
Abstract
The Tonga‒Kermadec subduction zone is located between the Pacific and Australian plates and is the site of the highest rates of Pacific plate subduction and dominant extension. In 2006 and 2009 in this region, two strong earthquakes occurred with magnitudes Mw = 8.0 and 8.1. There are about 170 islands in the Tonga region. They are volcanic centers that have erupted regularly over the past few decades. The paper presents the results of determining temporal variations in the slope of the earthquakes recurrence curve (b-value) in the Tonga subduction zone for 2005–2022 and variations in b depending on depth. Temporal variations in the b-value reflect the general tendency for the most powerful earthquakes to occur against the background of a decrease in b-value only in the surface layer at depths of 0–100 km. By comparing the variation of b-value with depth with a tectonic model of the Tonga subduction zone, it suggested that lower b-value might reflect greater stress at the top of the subducted slab due to its bending. Elevated b-value can apparently be associated with stretching mechanisms. For the Tonga subduction zone, as for other subduction zones, the increased b-value identified at a depth of 90‒100 km, which may be due to the presence at this depth of a magmatic front, which is associated with active volcanism.
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About the authors
A. A. Shakirova
Kamchatka Branch of the Geophysical Survey of Russian Academy of Sciences
Author for correspondence.
Email: shaki@emsd.ru
Russian Federation, Petropavlovsk-Kamchatsky
V. A. Saltykov
Kamchatka Branch of the Geophysical Survey of Russian Academy of Sciences
Email: shaki@emsd.ru
Russian Federation, Petropavlovsk-Kamchatsky
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