Lithospheric structure of the Pampean flat slab region from double-difference tomography

Impact of the Juan Fernandez Ridge on the Pampean Flat Subduction Inferred From Full Waveform Inversion

“…In the central part of the Pampean flat slab, two low‐velocity anomalies (M1 and M2) span a slab window along the inland projection of the JFR (Figure 2c and Profile [b] in Figure 3) and are surrounded by two high‐velocity limbs of the flat slab (H2). Though many prior works detected the Pampean flat slab with strong heterogeneities, most of seismological studies focused on the seismic structure south of S (e.g., Linkimer et al., 2020; Marot et al., 2014; Porter et al., 2012; Wagner et al., 2005), leaving an observational gap from –S. In this study, events and stations north of S are included in the inversion, allowing us to resolve M1 and M2.…”

New Timing Constraints for the Onset of Laramide Deformation in Southwest Montana Challenge our Understanding of the Development of a Thick‐Skinned Structural Style During Flat‐Slab Subduction

“…Therefore, the potential role of structural and sedimentological inheritance in controlling the style of foreland basin deformation must be considered when evaluating the effects of flat-subduction related deformation in Montana. In addition, the difference between the timing of deformation in Montana and the predicted temporal sweep from the margin inboard may provide insight into how lithospheric stress is transferred over long length scales along a dynamically variable plate margin as is seen in potentially analogous regions such as the flat-slab segment of the Sierras Pampeanas, Argentina (e.g., Linkimer et al, 2020).…”

Long‐Term Lithospheric Strength and Upper‐Plate Seismicity in the Southern Central Andes, 29°–39°S

“…The SCA are one of the most seismically active regions along the South American convergent margin, where past seismic events had devastating impacts on humans, with loss of life and far‐reaching economic repercussions (Alvarado & Beck, 2006; Alvarado, Barrientos, et al., 2009; Ammirati et al., 2019; Gregori & Christiansen, 2018; Ruiz & Madariaga, 2018). So far, seismological research in the SCA focused on understanding the causative dynamics of the recorded seismicity within the oceanic plate and along the subduction interface (e.g., Anderson et al., 2007; Cloos & Shreve, 1996; Hackney et al., 2006; Linkimer et al., 2020; Moreno et al., 2010, 2014; Wagner et al., 2020; Weiss et al., 2019), while less attention has been paid to the mechanisms controlling upper‐plate seismicity (Alvarado et al., 2005; Alvarado, Barrientos, et al., 2009; Alvarado, Pardo, et al., 2009; Ammirati et al., 2019; Nacif et al., 2017; Smalley & Isacks, 1990; Smalley et al., 1993).…”