Postseismic geodetic signature of cold forearc mantle in subduction zones

Luo, Haipeng; Wang, Kelin

doi:10.1038/s41561-020-00679-9

Cited by 40 publications

(55 citation statements)

References 71 publications

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“…This may explain why uncertainty does not decrease with coseismic moment. When considering both mechanisms, separating their respective contributions is also a difficult problem, particularly in the lower crust (Jacobs et al., 2002 ; Luo & Wang, 2021 ). Modeling additional mechanisms also requires more complex rheological model spaces, thus additional free parameters (e.g., Bruhat et al., 2011 ; Muto et al., 2016 ; B. Zhao et al., 2017 ).…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, the deformation signals of different postseismic mechanisms may be overlain and concurrent (Barbot & Fialko, 2010 ), making it difficult to distinguish their individual contributions (e.g., Biggs et al., 2009 ; Ryder et al., 2007 ). Separating the contributions of afterslip and viscoelastic relaxation becomes particularly difficult above mainshock magnitudes M w 6.5‐7, and the two processes can trade off strongly in models (e.g., Jacobs et al., 2002 ; Sun & Wang, 2015 ; Luo & Wang, 2021 ; M. Wang et al., 2021 ).…”

Section: Introductionmentioning

confidence: 99%

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Afterslip Moment Scaling and Variability From a Global Compilation of Estimates

et al. 2022

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Afterslip Moment Scaling and Variability From a Global Compilation of Estimates

et al. 2022

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“…One of the most fundamental characteristics of subduction zones is the contrast between cold forearc and hot volcanic arc, reflected in surface heat flow and other geophysical observations (e.g., Honda, 1985;Wada & Wang, 2009). The contrast reflects a maximum depth of decoupling (MDD), at about 70-80 km depth, between the subducting slab and the overlying mantle wedge (Furukawa, 1993;Luo & Wang, 2021;Syracuse et al, 2010;Uchida et al, 2020;Wada & Wang, 2009;Wada et al, 2008Wada et al, , 2011. Updip of the MDD, the subduction shear zone (plate interface) is rheologically much weaker than the overlying mantle and consequently accommodates all the shear strain, resulting in a cool and stagnant forearc mantle wedge (the so-called "cold nose") (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

On the Stability of Talc in Subduction Zones: A Possible Control on the Maximum Depth of Decoupling Between the Subducting Plate and Mantle Wedge

Peacock

Wang

2021

Geophysical Research Letters

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Talc, a very weak mineral, is stable in H 2 O-undersaturated ultramafic (mantle) rocks at P < ∼2-2.5 GPa (70-80 km depth) and T < ∼650°C • At pressures greater than ∼2-2.5 GPa, talc breaks down via the P-dependent reaction:talc + forsterite = antigorite + enstatite • The breakdown of talc may explain the change in subduction-interface rheology at 70-80 km depth where full slab-mantle coupling begins

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“…Monitoring the displacement rate on fault plates can help forecast possible earthquakes [32][33][34]. Displacements accumulated on faults eventually move the main fault plates [1].…”

Section: Introductionmentioning

confidence: 99%

“…The authors analyzed how seismic data affect the earthquake and the Chilean subduction zone in 2011. Lu and Wang (2021) [34] demonstrated a post-seismic deformation with large subduction earthquakes and studied the independent evidence. They showed how the seaward post-seismic motion is deflecting upward at the edge of the cold forearc mantle wedge, thereby causing diagnostic uplift.…”

Section: Introductionmentioning

confidence: 99%

Incorporating Persistent Scatterer Interferometry and Radon Anomaly to Understand the Anar Fault Mechanism and Observing New Evidence of Intensified Activity

et al. 2021

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Interferometric Synthetic Aperture Radar (InSAR) monitors surface change and displacement over a large area with millimeter-level precision and meter-level resolution. Anar fault, with a length of ~200 km, is located in central Iran. Recent seismological studies on the fault indicated that it is approaching the end of its seismic cycle. Although a large earthquake is imminent, the mechanism of the fault is not well understood. Therefore, understanding and discovering the mechanism of Anar fault remains a challenge. Here, we present an approach of displacement fault analysis utilizing a combination of InSAR data obtained from the persistent scatterer interferometry (PSI) method and 178 Sentinel-1 images (ascending and descending) (2017–2020). We incorporated groundwater samples from 40 wells, radon concentration anomaly mapping, Global Positioning System (GPS), and 3D displacement measurement acquired over four years (2016–2020). We investigated and monitored the deformation of the fault plate’s behavior over the last three years (2017–2020) to explore new evidence and signature of displacement. The results show that the time series analysis in the fault range has an increasing displacement rate in all dimensions. We observed that the line-of-sight (LOS) displacement rate varied from −15 mm to 5 mm per year. Our calculations show that the E–W, N–S, and vertical displacement rates of the fault blocks are 2 mm to −2 mm, 6 mm to −6 mm, and 2 mm to −4 mm per year, respectively. An anomaly map of the radon concentration shows that the complete alignment of the high concentration ranges with the fault strike and the radon concentration increased on average from 23.85 Bq/L to 25.30 Bq/L over these three years. Therefore, we predict rising the radon concentration is due to the increase in activity which resulted in a deformation. Finally, our findings show that the Anar fault is an oblique and right-lateral strike-slip with a normal component mechanism. We validated the proposed method and our results by comparing the GPS field data and PSI measurements. The root mean square error (RMSE) of the PSI measurement is estimated to be 0.142 mm. Based on the supporting evidence and signature, we conclude that the Anar fault activity increased between 2017 and 2020.

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Postseismic geodetic signature of cold forearc mantle in subduction zones

Cited by 40 publications

References 71 publications

Afterslip Moment Scaling and Variability From a Global Compilation of Estimates

Afterslip Moment Scaling and Variability From a Global Compilation of Estimates

On the Stability of Talc in Subduction Zones: A Possible Control on the Maximum Depth of Decoupling Between the Subducting Plate and Mantle Wedge

Incorporating Persistent Scatterer Interferometry and Radon Anomaly to Understand the Anar Fault Mechanism and Observing New Evidence of Intensified Activity

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