DOI: 10.5281/zenodo.10817456
title: Earthquake stress-drop catalog and finite-element models of force balance for the Japanese forearc lithosphere

description: This repository contains the catalog of events with a stress-drop estimate and ABAQUS output databases of 2D finite-element models of force-balance presented in Bocchini et al. (2025).

The repository contains:

The initial catalog (11 March 2011 to 31 December 2021) with all the available corner frequency and stress-drop estimates for individual events (Stress_drops_initial_catalog.csv). The file contains also info about the quality of hypocentral solutions, and uncertainties in moment magnitude, corner frequency and stress-drop values. For events where corner frequency estimates are derived from various methods, we assign a stress drop value based on the following priority order: first, the target event spectral ratio estimate; second, the empirical Green function (eGf) event spectral ratio estimate; third, the attenuation-corrected single-spectrum estimate; and finally, the single-spectrum estimate.

Both the initial catalog (stress_drop_initial_catalog.csv) and the refined catalog (stress_drop_refined_catalog.csv) after implementing quality control criteria (see Bocchini et al., 2025) with the preferred stress-drop and corner-frequency value.  The initial catalog consists of 18,016 events, including: 510 estimates for target events obtained from spectral-ratio fitting, 156 estimates for the empirican Green function (eGf) events obtained from spectral-ratio fitting, 9,897 estimates obtained from individual spectra corrected for attenuation, and 7,453 estimates obtained from single spectrum-fitting without attenuation correction. The refined catalog, used in Bocchini et al., (2025), consists of 10,469 events, including: 510 estimates for target events obtained from spectral-ratio fitting, 156 estimates for the empirical Green function (eGf) events obtained from spectral-ratio fitting, 7,193 estimates obtained from individual spectra corrected for attenuation, and 2,610 estimates obtained from single spectrum-fitting without attenuation correction. 

The IDs of events along the Iwaki and Sendai transects for two different temporal intervals (Ids_events_iwaki_2011_2012.csv, Ids_events_iwaki_2012_2022.csv, Ids_events_sendai_2011_2012.csv, Ids_events_sendai_2012_2022.csv). The list of Ids can be used to extract events and stress-drop values from the files containing the stress drop estimates.

The list of stations used for corner-frequency and stress-drop analysis. 

The 2D finite-element models determine the absolute stress in the Japanese forearc lithosphere along the Iwaki and Sendai transects. The models compute the stress in the forearc after the Mw 9.0 11 March 2011 Tohoku-Oki earthquake and account for viscoelastic stress relaxation in the first postseismic year. We report the deviatoric stresses and information on time steps. 

 

If you use material included in this repository please cite Bocchini et al. (2025).

 

Reference:

Bocchini, G. M., Dielforder, A., Kemna, K. B., Harrington, R. M., & Cochran, E. S. (2025). Earthquake stress-drop values delineate spatial variations in maximum shear stress in the Japanese forearc lithosphere. Communications Earth & Environment, 6(1), 858. https://doi.org/10.1038/s43247-025-02877-y