DOI: 10.5061/dryad.z08kprrjq
title: Data and code from: Using contrasts in horizontal P-wave reflectivity to map the base of the continental lithosphere: Results for the central and eastern U.S.

description: We used seismic P-waves generated by earthquakes in the western Pacific to
 conduct “echo soundings” of geologic structure beneath the United
 States.  Our goals were to investigate the deep structure of the
 Appalachian Mountains, determine the thickness of the underlying North
 American tectonic plate ("lithosphere"), and investigate the
 nature of flow within the asthenosphere, the layer of less rigid material
 beneath the plate.  After traveling through the Earth’s core,
 these waves are reflected at Earth’s surface and travel back into the
 interior, where they are reflected back to the surface by major
 compositional boundaries.  The echoes were recorded by the
 “Transportable Array” of seismograph stations that moved across the United
 States from 2004 to 2014.   We used a subset of stations
 from 15 east-west profiles to construct cross sections across the Atlantic
 Coastal Plain, Appalachian Mountains, and more ancient crust of the
 continental interior.  Our soundings are consistent with results
 of earlier studies that suggest that the lithosphere gets thicker as it
 gets older.   The lower lithosphere is marked by a
 significant increase in the number and continuity of reflections,
 supporting the interpretation of elevated strain in the lowermost
 lithosphere as well as drag-induced flow in the asthenosphere produced by
 westward motion of the overlying plate. 
description: The original data set was recorded by broadband seismograph
 stations along Lines L through Z of the Transportable Array as part of the
 EarthScope project.  Waveforms downloaded from the IRIS Data Management
 Center can be found in "part3" of the archive.      Processing
 of the data is explained in detail in directory "part2".  
 "part4", "part 5", "part 6", and
 "part7" of the archive contain input files, shell scripts, and
 output files.  The directory "part1" contains all software
 developed by Hawman for analysis of the seismic waveform data.  Three
 subdirectories contain the source code, make files, and executable files
 (compiled on macOS version 10.8.4; tested on macOS versions through
 10.12.6).
description: All data files were processed on a UNIX operating system (macOS
 versions 10.8.4 through 10.12.6).  The Seismic Analysis Code (SAC;
 Goldstein & Snoke, ) was used for preliminary processing
 (windowing; removal of trace means and trends).  Resampling and plotting
 were carried out using the Colorado School of Mines Seismic Unix (SU)
 software package (Cohen & Stockwell, 2008).  All other processing
 was carried out using software written by Hawman and included in directory
 "part1" of this archive.  Guidelines for using this software are
 given in directory "part2".  "Part 4" contains shell
 scripts, parameter files, and output files for all steps (101-402) for
 Transportable Array Line W, to illustrate the basic processing flow.
 "Part5" contains shell scripts, parameter files, and output
 files for steps 101-301 for TA Line V.  "Part6" contains shell
 scripts, parameter files, and output files for steps 101-105 for TA line
 U. "Part 7" contains shell scripts, parameter files, and output
 files for steps 302, 303, 401, and 402 for all TA lines (L through
 Z).
description: # Data and code from: Using contrasts in horizontal P-wave reflectivity to
 map the base of the continental lithosphere: Results for the central and
 eastern U.S. ## Description of the data and file structure Archive of
 materials for manuscript entitled Using contrasts in horizontal P-wave
 reflectivity to map the base of the continental lithosphere: Results for
 the central and eastern U.S., by Laura E. Hanawalt, Michael P. Cuilik, and
 Robert B. Hawman The archive is organized into 7 directories: 1. Part 1
 contains all the software developed by Hawman for analysis of the seismic
 waveform data. Three subdirectories contain the source code, make files,
 and executable files (compiled on macOS version 10.8.4; tested on macOS
 versions through 10.12.6). 2. Part 2 contains the following:
 "pkikp_short_summary_of_steps_v23.pdf" (and *.doc version) : a
 brief description of shell scripts used to generate the results presented
 in the manuscript. The scripts are broken down into a number of steps:
 step101, 102, 103, 104, 105, 201, 201newmute, 202, 203, 301, 302, 302env,
 303, 401, and 402. 1. Part 3 contains binary data files (seismic waveforms
 downloaded from the IRIS Data Management Center) in SAC format for the 16
 earthquakes analyzed for this study, as recorded along lines L through Z
 of the EarthScope Transportable Array (TA). 2. Part 4 contains shell
 scripts, parameter files, and output files for all steps (101-402) for TA
 Line W, to illustrate the basic processing flow. 3. Part 5 contains shell
 scripts, parameter files, and output files for steps 101-402 for TA Line
 V. 4. Part 6 contains shell scripts, parameter files, and output files for
 steps 101-105 for TA Line U. 5. Part 7 contains shell scripts, parameter
 files, and output files for steps 302, 303, 401, and 402 for all TA lines
 (L through Z). 6. Sharing/Access information Data was originally derived
 from the following sources: IRIS Data Management Center
 ([https://www.iris.edu/SeismiQuery](https://www.iris.edu/SeismiQuery))
 However, that website is no longer active.  Date files can now be
 downloaded using the following website:
 [https://ds.iris.edu/wilber3/](https://ds.iris.edu/wilber3/) ##
 Code/Software 1. Part 1 contains all the software developed by Hawman for
 analysis of the seismic waveform data. Three subdirectories contain the
 source code, make files, and executable files (compiled on macOS version
 10.8.4; tested on macOS versions through 10.12.6). 2. Part 2 contains the
 following: pkikp_short_summary_of_steps_v23.pdf: a brief description of
 shell scripts used to generate the results presented in the manuscript.
 The scripts are broken down into a number of steps: step101, 102, 103,
 104, 105, 201, 201newmute, 202, 203, 301, 302, 302env, 303, 401, and 402.
 1. Part 4 contains shell scripts, parameter files, and output files for
 all steps (101-402) for TA Line W, to illustrate the basic processing
 flow.