This Thorne_readme20210217.txt file was generated on [20210217] by Michael S. Thorne Links to Publication Field updated 20211209 TK ------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset 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 2. Author Information Principal Investigator Contact Information Name: Michael S. Thorne Institution: University of Utah Address: Frederick Albert Sutton Building 115 S 1460 E, ROOM 383 Salt Lake City, UT 84112-0102 Email: michael.thorne@utah.edu Name: Justin D. Krier Institution: University of Utah Address: Frederick Albert Sutton Building 115 S 1460 E, ROOM 383 Salt Lake City, UT 84112-0102 Email: krier.jd@gmail.com Name: Kuangdai Leng Institution: Dept. of Earth Sciences, University of Oxford Address: 3 S Parks Rd Oxford OX1 3AN United Kingdom Email: kuangdai.leng@stfc.ac.uk Name: Tarje Nissen-Meyer Institution: Dept. of Earth Sciences, University of Oxford Address: 3 S Parks Rd Oxford OX1 3AN United Kingdom Email: tarje.nissen-meyer@earth.ox.ac.uk 3. Date of data collection (single date, range, approximate date) Data included here were collected from approximately 20190101 to 20200101. This collection of data were compiled from publicly available data sources: (1) Incorporated Research Institutions for Seismology (IRIS) (2) the Caltech/USGS Southern California Earthquake Data Center (SCEDC), (3) the Canadian National Seismograph Network (CNSN), and (4) the Observatories & Research Facilities for European Seismology (ORFEUS). The earthquakes used in this study occurred from June 30, 2002 to November 18, 2018 4. Geographic location of data collection (where was data collected?): NA. 5. Information about funding sources that supported the collection of the data: This work was supported by NSF grant EAR-1723081. -------------------------- SHARING/ACCESS INFORMATION -------------------------- 1. Licenses/restrictions placed on the data: Public Domain 2. Links to publications that cite or use the data: This collection of data was compiled for: Justin D. Krier, Michael S. Thorne, Kuangdai Leng, and Tarje Nissen-Meyer (2021) 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. Journal of Geophysical Research: Solid Earth. https://doi.org/10.1029/2021JB021897 3. Links to other publicly accessible locations of the data: NA 4. Links/relationships to ancillary data sets: NA 5. Was data derived from another source? If yes, list source(s): 6. Recommended citation for the data: Justin Krier, Michael S. Thorne, Kuangdai Leng, and Tarje Nissen-Meyer (2021) 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. The Hive: University of Utah Research Data Repository. https://doi.org/10.7278/S50DT3X22GGB --------------------- DATA & FILE OVERVIEW --------------------- Seismic data are provided for 13 earthquakes (see Table 1 in Krier et al. 2021) for earthqauke parameters. Data for each earthquake are provided in their own directory. The naming convention for each directory is: yyyymmddhhmm i.e., the directory name is given in terms of event year, month, day, hour, and minute that the earthquake occurred. Within each directory the seismograms for that earthquake are stored in Seismic Analysis Code (SAC) format. Radial component seismograms are given that are windowed in time around the SKS seismic arrival. The naming convention of each file is eventid.network.stationcode.component.sac eventid = the same ID as given above (yyyymmddhhmm) for the event network = the two letter seismic network code for the station stationcode = the seismic station abbreviation component = either BHR or HHR for broadband radial or highgain radial component seismogram sac = file format (seismic analysis code) In total: 6,523 individual seismic recordings are provided. 2. Relationship between files: 3. Additional related data collected that was not included in the current data package: NA 4. Are there multiple versions of the dataset? yes/no no -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection/generation of data: All of the earthquakes occurred in the Tonga/Fiji trench and were recorded in N. and S. America. The earthquakes were chosen such that the seismic wave arrivals (SKS, SKKS, and SPdKS) all interacted with the feature (called the Samoan ULVZ) at the core-mantle boundary beneath the Samoan islands. All events collected before 2018 were collected as a part of the following work: Thorne, M.S., Pachhai, S., Leng, K., Wicks, J.K., and Nissen-Meyer, T. (2020) New candidate ultralow-velocity zone locations from highly anomalous SPdKS waveforms, Minerals, 10 , 1-26, doi: 10.3390/min10030211. Data collection is described in this paper. Data collected for the 2018 earthquakes followed the same procedure. 2. Methods for processing the data: Data are initially processed as follows: (1) the mean and trend of the trace is removed, (2) instrument response is removed, (3) files are rotated to the great circle path and the radial component of the trace is retained, (4) traces with data gaps within ±200 s of the SKS arrival were removed, (5) seismograms retrieved from more than one data center were reduced such that only a single instance of a seismogram was retained. 3. Instrument- or software-specific information needed to interpret the data: These data are written in seismic analysis code (SAC) format. 4. Standards and calibration information, if appropriate: NA 5. Environmental/experimental conditions: NA 6. Describe any quality-assurance procedures performed on the data: Quality assurance is described in detail in: Thorne, M.S., Pachhai, S., Leng, K., Wicks, J.K., and Nissen-Meyer, T. (2020) New candidate ultralow-velocity zone locations from highly anomalous SPdKS waveforms, Minerals, 10 , 1-26, doi: 10.3390/min10030211. 7. People involved with sample collection, processing, analysis and/or submission: Michael S. Thorne and Justin D. Krier