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Data for: Effects of 2.5-D ultra-low and ultra-high velocity zones on flip-reverse-stacking (FRS) of the ScS wavefield

Description:: This dataset includes seismic waveforms for an event used in the study "Effects of 2.5-D ultra-low and ultra-high velocity zones on flip-reverse-stacking (FRS) of the ScS wavefield". In addition, because ultra-high velocity zone (UHVZ) synthetic computations can be challenging when using ray based methods, we include our full waveform solutions for 1-D and 2.5-D UHVZ models as discussed in our manuscript. These can be used to benchmark other methods.
Keyword:: ultra-low velocity zones and core-mantle boundary
Subject:: Geophysics and Seismology
Creator:: Thorne, Michael S.
Owner:: Michael Thorne
Language:: English
Date Uploaded:: 07/06/2024
Date Modified:: 07/15/2024
Date Created:: 2024-01-01 to 2024-06-01
License:: Public Domain – This data is free of copyright restrictions (e.g. government sponsored data).
Resource Type:: Dataset
Identifier:: https://doi.org/10.7278/S5d-gsmt-m8bc

Data for: Investigating Spatiotemporal Groundwater Variations in the Wasatch Front Using Geophysical Methods

Description:: This dataset includes electrical resistivity tomography (ERT) measurements collected around the Great Salt Lake (GSL). This was supported through an NSF Rapid proposal. These preliminary measurements form a baseline by which to do ERT measurements to detect ground-water changes around GSL.
Keyword:: Great Salt Lake, geophysics, electrical resistivity tomography, and groundwater
Subject:: Geophysics and Geology
Creator:: Thorne, Michael S.
Owner:: Michael Thorne
Based Near Label Tesim:: Great Salt Lake, Utah, United States
Language:: English
Date Uploaded:: 06/19/2024
Date Modified:: 06/20/2024
Date Created:: 2023-06-06 to 2023-10-09
License:: Public Domain – This data is free of copyright restrictions (e.g. government sponsored data).
Resource Type:: Dataset
Identifier:: https://doi.org/10.7278/S5d-mdx6-v88s

Data for: A compositional component to the Samoa ultralow-velocity zone revealed through 2- and 3-D waveform modeling of SKS and SKKS differential travel-times and amplitudes.

Description:: We analyzed 4,754 broadband seismic recordings of the SKS, SKKS, and SPdKS wavefield from 13 high quality events sampling the Samoa ultralow-velocity zone (ULVZ). We measured differential travel-times and amplitudes between the SKKS and SKS arrivals, which are highly sensitive to the emergence of the SPdKS seismic phase, which is in turn highly sensitive to lowermost mantle velocity perturbations such as generated by ULVZs. We modeled these data using a 2-D axi-symmetric waveform modeling approach and are able to explain these data with a single ULVZ. In order to predict both travel-time and amplitude perturbations we found that a large ULVZ length in the great circle arc direction on the order of 10° or larger is required. The large ULVZ length limits acceptable ULVZ elastic parameters. Here we find that δVS and δVP reductions from 20% to 22% and 15% to 17% respectively gives us the best fit, with a thickness of 26 km. Initial 3-D modeling efforts do not recover the extremes in the differential measurements, demonstrating that 3-D effects are important and must be considered in the future. However, the 3-D modeling is generally consistent with the velocity reductions recovered with the 2-D modeling. These velocity reductions are compatible with a compositional component to the ULVZ. Furthermore, geodynamic predictions for a compositional ULVZ that is moving predict a long linear shape similar to the shape of the Samoa ULVZ we confirm in this study. and This collection includes radial component displacement seismograms in the time window including the SKS, SKKS and SPdKS seismic arrivals. These data all interact with the Samoa ultra-low velocity zone at the core-mantle boundary. All data used in the study of Krier et al., 2021 (JGR) is included in this collection.
Subject:: Geology, seismology, and Geophysics
Creator:: Michael S. Thorne, Tarje Nissen-Meyer, Justin D. Krier, and Kuangdai Leng
Owner:: Michael Thorne
Based Near Label Tesim:: Tonga Trench, , Tonga
Language:: English
Date Uploaded:: 02/17/2021
Date Modified:: 12/09/2021
Date Created:: January 2019 to January 2020
Resource Type:: Dataset
Identifier:: https://doi.org/10.7278/S50DT3X22GGB

Data for: Effects of 2.5-D ultra-low and ultra-high velocity zones on flip-reverse-stacking (FRS) of the ScS wavefield

Data for: Investigating Spatiotemporal Groundwater Variations in the Wasatch Front Using Geophysical Methods

Data for: A compositional component to the Samoa ultralow-velocity zone revealed through 2- and 3-D waveform modeling of SKS and SKKS differential travel-times and amplitudes.

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