A Uniform Database of Teleseismic Shear-Wave Splitting Measurements for the Western and Central United States: December 2014 Update

The electronic supplement of the paper consists of three plain-text tables, which can be viewed directly using a web browser. They can also be saved to the user’s local disk and be displayed using various mapping software such as Generic Mapping Tools (see Data and Resources). A ZIP archive file is included that contains all three tables.

**Download/View:** Table S1 [Plain Text Comma-separated Values; ~2.5 MB]. Individual shear-wave splitting measurements. This table contains all 23,448 individual measurements presented in the main article. The measurements are plotted in Figure 3 of the main article.

The columns are as follows.

- St-name: Name of the station (the original station name is padded with x’s if it has less than six letters; the last two letters denote the network code, which is padded with a “y” for single-letter network codes)
- Phase: Phase used for analysis (
*SKS*,*SKKS*, or*PKS*) - Event-name: Event origin time (yydddhhmm, using Julian days)
- St-lat: Station latitude (°)
- St-lon: Station longitude (°)
- PHI: Fast orientation (degrees clockwise from the north)
- PHI-STD: Standard deviation (SD) of fast orientation
- DT: Splitting time (s)
- DT-STD: SD of splitting time
- BAZ: Back azimuth of the event
- BAZ90: Modulo-90° back azimuth of the event
- Ev-lat: Event latitude (°)
- Ev-lon: Event longitude (°)
- Ev-dep: Focal depth (km)
- Ranking: Rank for the measurement
- PP-lon: Latitude of the ray-piercing points (° at 200 km depth)
- PP-lat: Longitude of the ray-piercing points (° at 200 km depth)

**Download/View:** Table S2 [Plain Text Comma-separated Values; ~121 KB]. Station-averaged splitting parameters. This table contains all 2400 station-averaged measurements presented in the main article. The measurements are plotted in Figure 4 of the main article.

The columns are as follows.

- St-name: Name of the station (see Table S1 caption for description of padding to station names)
- St-lat: Station latitude (°)
- St-lon: Station longitude (°)
- PHI: Circular mean of the fast orientations observed at the station
- PHI-STD: Circular SD of the fast orientations (for
*N*=1, it is the SD of the individual measurement) - DT: Simple mean of the splitting times observed at the station
- DT-STD: Simple SD of the splitting times observed at the station
- N-meas: Number of measurements at the station

**Download/View:** Table S3 [Plain Text Comma-separated Values; ~30 KB]. Averaged splitting parameters in 726 overlapping circles of 1° radius. The distance between the center of neighboring circles is 1 geographic degree. The data are plotted in Figure 5 of the main article.

The columns in the table are as follows.

- C-lat: Latitude of the center of the circle (°)
- C-lon: Longitude of the center of the circles (°)
- PHI: Circular mean of the fast orientations in the circle
- PHI-STD: Circular SD of the fast orientations in the circle
- DT: Simple mean of the splitting times
- DT-STD: Simple SD of the splitting times
- N-meas: Number of individual measurements in the circle

**Download:** Tables S1–S3 [ZIP archive of Tables S1–S3; ~750 KB].

Generic Mapping Tools is available from http://gmt.soest.hawaii.edu/ (last accessed December 2015).

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