Upper mantle and continental crust anisotropy in southeastern Mexico determined from shear-wave splitting measurements using local intraslab earthquakes

Celis, Samuel; Valenzuela, R.; Soto, Gerardo León; Pérez‐Campos, Xyoli

doi:10.1016/j.jsames.2022.104023

Cited by 3 publications

(1 citation statement)

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“…In some relatively new imaging results, the detailed information on the velocity structure directly related to the possible tearing of the Cocos plate is also not provided (Amaru, 2007; Hosseini et al., 2020; Li et al., 2008; Lu et al., 2019; van Benthem, Govers, et al., 2013; van der Hilst et al., 1997; Zhu et al., 2020). The existing shear‐wave splitting research in this region can provide the overall anisotropic effect under the station (Bernal‐Lopez et al., 2016; Castellanos et al., 2017; Celis et al., 2022; Soto et al., 2021; van Benthem, Valenzuela, & Ponce, 2013), but the spatial coverage and depth constraint are insufficient. Given the ongoing debate regarding the presence and location of slab tears in southern Mexico, we emphasized the need for new high‐accuracy and high‐resolution velocity and anisotropy tomography studies for further investigation.…”

Section: Introductionmentioning

confidence: 99%

New Constraints on the Complex Subduction and Tearing Model of the Cocos Plate Using Anisotropic Pn Tomography

Lü,

Li,

Zhao

et al. 2023

Geochem Geophys Geosyst

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To better understand the structure and process of the Cocos plate subduction, we obtained the first Pn velocity and anisotropy model of the uppermost mantle in southern Mexico using the Pn tomography method and new ISC‐EHB data. This study confirms that the subducted Cocos oceanic plate exhibits mid‐oceanic ridge‐perpendicular anisotropy, and there is an arc‐parallel anisotropic structure beneath the subduction arc. The variation of the Pn velocity and anisotropy structure at the east and west ends of the flat‐slab subduction zone in the Guerrero area provide new and clear seismological images for a plate‐tearing model which might be caused by the Orozco and O'Gorman fracture zones. The Pn low‐velocity and trench‐perpendicular anisotropic structure found north of the flat‐slab subduction zone support the slab retreat model of the Central Cocos plate. The Pn structure supports the existence of tearing corresponding to Teuhantepec Ridge in the Cocos plate beneath the Isthmus of Tuxtlas. Our study provides a reliable tomography basis and new constraints for a complicated subduction dynamics process in the southern Mexico subduction zone.

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