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Days before the strike: precursory waveform decoherence preceding major strike-slip earthquakes

This dataset contains the cross-correlation functions of station pairs used for Ridgecrest, CA, Turkiye (EAFZ), and Aegean Sea (NAT). The dataset is compressed in a tar.gz. To decompress, use tar -xzvf filename.tar.gz. Download and decompress the cross-correlations dataset named WF_DEC_DAT_CC.tar.gz.

Description of the data and file structure

The dataset is organized by study area as follows: ZONE (Aegean, Ridgecrest, Turkey) with sub-directories CC (cross-correlation functions).

Sub-directories CC contain sub-directories named according to station pairs (e.g., XXX_YYY) storing cross-correlation functions in numpy arrays organized by stacking (5, 10, and 20 days) and different frequency bands, adapted to use in the Ambient-Noise Seismology Package NoisePy https://github.com/noisepy/NoisePy (Jiang and Denolle, 2020).

Data was derived from the following sources:

• The raw data can be downloaded from https://ds.iris.edu/mda/CI/ (for Ridgecrest dataset) and https://www.orfeus-eu.org/data/ for (Turkey and Aegean Sea datasets). The cross-correlation functions computed using MSNoise http://msnoise.org/doc/index.html/ Lecocq et al (2014).

Code/Software

To reproduce the results and conclusion of the manuscript, use the Jupyter notebooks available at https://github.com/fjmunozb/EQ_Precursors. Find also python environments to install MSNoise and NoisePy.