The 2013 Slab‐Wide Kamchatka Earthquake Sequence

Rousset, Baptiste; Campillo, Míchel; Shapiro, N. M.; Walpersdorf, Andréa; Titkov, N. N.; Chebrov, Danila

doi:10.1029/2022gl101856

Cited by 4 publications

(2 citation statements)

References 56 publications

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“…Ускорением погружения океанической плиты и усилением каплинга в работе [Rousset et al, 2023] et al, 2020]. Analysis has been made on seismic events with M l ≥3.5, Ks≥8.5, H≤100 km, the epicenters of which were located at 50-56.5 °N 155-164 °E.…”

Section: обсуждение полученных результатовmentioning

confidence: 99%

GNSS-Based Modeling and Study of Postseismic Crustal Movement of the May 24, 2013, MW 8.3 Sea of Okhotsk Deep-Focus Earthquake

Shestakov,

Nechaev,

Titkov

et al. 2024

Geodin. tektonofiz.

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The mechanisms of preparation and occurrence of the strongest deep-focus earthquakes with MW≥8, as well as their surface manifestations, remain insufficiently studied because of the lack of the relevant data. There are but three seismic events of this kind which have so far been instrumentally recorded. This paper describes the identification and analysis of the changes in the characteristics of modern crustal movement of the 2013, MW 8.3 Sea of Okhotsk deep-focus earthquake based on the data from long-term continuous geodetic-class GNSS stations in the Sea of Okhotsk region on the Kamchatka Peninsula, the Sakhalin Island, and the coast of the Sea of Okhotsk and the Sea of Japan. There has been found temporal stability of variations in the average annual geodetic site velocities. The coordinates of GNSS-stations do not show non-linear changes typical of strong shallow earthquakes in the initial post-seismic period. The Maxwell rheology for modeling of viscoelastic relaxation of the asthenosphere/upper mantle as a result of seismic impact allows for a first approximation to qualitatively and quantitatively reproduce the displacement patterns of GNSS-sites of the Kamchatka Peninsula observed in the initial postseismic period (2–3 years after the mainshock). After that, the model estimates of postseismic movements of the peninsula become systematically lower than the observed. The values calculated for the OKHT station motion on the western coast of the Sea of Okhotsk are in good agreement with those recorded for postseismic displacements over the entire measurement interval. The observed directions of the Sakhalin Island postseismic movements systematically deviate to the northeast from the model directions and are oriented almost orthogonally to the Kuril-Kamchatka Trench. Besides the viscoelastic relaxation process, another possible reason for this issue could be an enhanced viscous friction in the bottom of the subducting Pacific plate, leading to the intense deformation of the Sakhalin Island and the western coast of Kamchatka.

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Section: обсуждение полученных результатовmentioning

confidence: 99%

GNSS-Based Modeling and Study of Postseismic Crustal Movement of the May 24, 2013, MW 8.3 Sea of Okhotsk Deep-Focus Earthquake

Shestakov,

Nechaev,

Titkov

et al. 2024

Geodin. tektonofiz.

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“…Recent studies suggest that large subduction earthquakes can affect the plate stress regime by showing either a synchronicity of the shallow and intermediate seismicity before large megathrust earthquakes 1,2,3,4 , a slab wide deformation transient concomitant with deep and shallow earthquake swarms before a large deep-focus earthquake 5 or a gravity field change 6,7 . The observation of largescale surface displacements reversals, several months before megathrust earthquakes also suggests the existence of deep precursors 8 .…”

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Change of deep subduction seismicity after a large megathrust earthquake

Gardonio

Marsan²,

Bodin

et al. 2023

Preprint

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Subduction zones are home to the world’s largest and deepest earthquakes. Recently, large-scale interactions between shallow (0-60 km) and intermediate (80-150km) seismicity have been evidenced before megathrust earthquakes along with large-scale changes in surface motion. Large-scale deformation transients following major earthquakes have also been observed possibly due to a change in slab pull or to a bending/unbending of the plates, which suggests the existence of interactions between the deep and shallow parts of the slab. In this study, we analyze the spatio-temporal variations of the Japanese seismicity before and after the 2011/3/11 Mw9.0 Tohoku-oki earthquake. We observe that the rate of the intermediate to deep (150-450km) seismicity underwent a deceleration of 55% south of the rupture zone and an acceleration of 30% north of it, coherent with the GPS surface displacements. This shows for the very first time how a megathrust earthquake can affect the stress state of the slab over a 2500 km lateral-range and a large depth range, demonstrating that earthquakes interact at a much greater scale than the surrounding rupture zone usually considered. Our vision of subduction zones must consequently be renewed as a whole, from shallow to large depths.

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Change of deep subduction seismicity after a large megathrust earthquake

Gardonio,

Marsan,

Bodin

et al. 2024

Nat Commun

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Subduction zones are home to the world’s largest and deepest earthquakes. Recently, large-scale interactions between shallow (0-60 km) and intermediate (80-150 km) seismicity have been evidenced during the interseismic period but also before and after megathrust earthquakes along with large-scale changes in surface motion. Large-scale deformation transients following major earthquakes have also been observed possibly due to a post-seismic change in slab pull or to a bending/unbending of the plates, which suggests the existence of interactions between the deep and shallow parts of the slab. In this study, we analyze the spatio-temporal variations of the declustered seismicity in Japan from 2000 to 2011/3/11 and from 2011/3/11 to 2013/3/11. We observe that the background rate of the intermediate to deep (150-450 km) seismicity underwent a deceleration of 55% south of the rupture zone and an acceleration of 30% north of it after the Tohoku-oki earthquake, consistent with the GPS surface displacements. This shows how a megathrust earthquake can affect the stress state of the slab over a 2500 km lateral range and a large depth range, demonstrating that earthquakes interact at a much greater scale than the surrounding rupture zone usually considered.

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The 2013 Slab‐Wide Kamchatka Earthquake Sequence

Cited by 4 publications

References 56 publications

GNSS-Based Modeling and Study of Postseismic Crustal Movement of the May 24, 2013, MW 8.3 Sea of Okhotsk Deep-Focus Earthquake

GNSS-Based Modeling and Study of Postseismic Crustal Movement of the May 24, 2013, MW 8.3 Sea of Okhotsk Deep-Focus Earthquake

Change of deep subduction seismicity after a large megathrust earthquake

Change of deep subduction seismicity after a large megathrust earthquake

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