ANCC-CIEI

ANCC-CIEI: Western US Ambient Noise Cross-Correlations

The ANCC-CIEI (Ambient Noise Cross-Correlation - Center for Imaging the Earth's Interior) is a specialized dataset provided by the NSF SAGE Facility through EarthScope. This product offers a comprehensive database of empirical Green's functions (EGFs) derived from ambient noise cross-correlations using data from 622 USArray Transportable Array (TA) stations west of 105° W, collected between 2005 and 2010. Key features include:

• Extensive Coverage: Contains 171,120 vertical component (LHZ) cross-correlation waveforms, providing detailed seismic data for the Western US.
• Advanced Processing: Utilizes traditional ambient noise processing methods (Bensen et al., 2007; Lin et al., 2008) with refinements for accurate amplitude measurements.
• Data Accessibility: Available as a 4.6 GB compressed tarball with stacked waveforms in SAC format and associated metadata.
• Quality Control: Includes inter-station distance metrics and effective time series length for reliable dispersion measurements.

Use Cases

• Seismic Research: Ideal for researchers studying surface wave dispersion, crustal and mantle structure, and seismic anisotropy in the Western US.
• Geophysical Modeling: Supports the creation of 3D models for isotropic shear velocity and azimuthal anisotropy.
• Educational Purposes: Useful for academic institutions teaching seismology and geophysics, providing real-world data for analysis.

This dataset is a critical resource for geoscientists aiming to understand subsurface structures through ambient noise tomography, offering robust and unbiased measurements validated by comparisons with earthquake data.