Multi-layer Seismic Anisotropy Beneath Greenland

Nathan, Erica; Hariharan, A.; Florez, D.; Fischer, K. M.

doi:10.1002/essoar.10505663.1

Cited by 2 publications

(1 citation statement)

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“…Some figures were prepared with GMT software (Wessel & Smith, 1998). Information about stations used in this study and individual shear‐wave splitting measurements used in this text are available as supplementary tables (Nathan et al., 2020).…”

Section: Data Availability Statementmentioning

confidence: 99%

Multi‐Layer Seismic Anisotropy Beneath Greenland

Nathan

Hariharan

Florez

et al. 2021

Geochem Geophys Geosyst

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Nearly all of Greenland's bedrock geology is inaccessible because it is covered by the Greenland Ice Sheet. Therefore, geophysical investigations are especially important in furthering our understanding of Greenland's subglacial lithospheric structure. Greenland is a region of interest as its lithosphere contains cratonic material and records the history of Archean, Proterozoic, and Paleozoic orogenies and could provide insight into the history of the Iceland plume (e.g., Henriksen et al., 2009). The majority of Greenland is Precambrian and has been modified by multiple tectonic (orogenic and rifting) events (e.g., Henriksen et al., 2009). Of particular note is the Trans-Hudson Orogeny, which was a widespread set of plate collisions that helped to build Laurentia around 1.8 Ga (e.g., St-Onge et al., 2009). Orogenic belts from this event can be found across North America; in Greenland, this includes the Rinkian and Nagssugtoqidian belts that bound major crustal blocks (e.g.

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Section: Data Availability Statementmentioning

confidence: 99%

Multi‐Layer Seismic Anisotropy Beneath Greenland

Nathan

Hariharan

Florez

et al. 2021

Geochem Geophys Geosyst

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Multilayer anisotropy along the Alaska-Aleutians Subduction zone

Birkey,

Lynner

2024

Geophysical Journal International

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Summary Increasing evidence from seismic methods shows that anisotropy within subduction zones should consist of multiple layers. To test this, we calculate and model shear wave splitting across the Alaska-Aleutians Subduction Zone (AASZ), where previous studies have argued for separate layers of anisotropy in the subslab, slab, and mantle wedge. We present an updated teleseismic splitting catalog along the span of the AASZ, which has many broadband seismometers recently upgraded to three components. Splitting observations are sparse in the Western Aleutians, and fast directions are oriented generally trench parallel. There are significantly more splitting measurements further east along the AASZ. We identify six regions in the Central and Eastern Aleutians, Alaskan Peninsula, and Cook Inlet with a high density of splits suitable for multilayered anisotropy analyses. These regions were tested for multilayer anisotropy, and for five of the six regions we favor multiple layers over a single layer of anisotropy. We find that the optimal setup for our models is one with a dipping middle layer oriented parallel to paleospreading. A prominent feature of our modeling is that fast directions above and below the dipping layer are generally oriented parallel to the strike of the slab. Additionally, we lay out a framework for robust and statistically reliable multilayer shear wave splitting modeling.

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Multi-layer Seismic Anisotropy Beneath Greenland

Cited by 2 publications

References 0 publications

Multi‐Layer Seismic Anisotropy Beneath Greenland

Multi‐Layer Seismic Anisotropy Beneath Greenland

Multilayer anisotropy along the Alaska-Aleutians Subduction zone

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