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Scaling relations and variability of source parameters for shallow crustal earthquakes in Europe

Authors
/persons/resource/mingshen

Yen,  Ming-Hsuan
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

/persons/resource/bindi

Bindi,  Dino
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Edwards,  Ben
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Oth,  Adrien
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

/persons/resource/rizac

Zaccarelli,  Riccardo
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

/persons/resource/fcotton

Cotton,  Fabrice
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Yen, M.-H., Bindi, D., Edwards, B., Oth, A., Zaccarelli, R., Cotton, F. (2023): Scaling relations and variability of source parameters for shallow crustal earthquakes in Europe, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3892


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020654
Abstract
The source parameter, stress drop, is a key parameter estimating strong ground motion, as it controls the level of peak ground acceleration. Several studies have investigated source parameters for many regions by various methods and assumptions (e.g., Japan, Southern California, and central Italy). In this study, we apply a non-parametric spectral decomposition to isolate the source, site, and path contributions on the Fourier amplitude spectra (FAS) in Europe. We propose the two-domain regionalized attenuation models in the spectral decomposition to take into account the varying attenuation of two spatial domains along the Alps. We download all available data from 1990 to 2020 in Europe through the European Integrated Data Archive (EIDA) within the stream2segment software. The analyzed FAS are selected from 35.6 million recordings which contain 6,135 earthquakes recorded by about 1,600 stations. The final data includes the induced events in Groningen and Poland and some significant events in Italy which provide the opportunity to discuss the variation between induced and natural earthquakes. To derive comparable source parameters in such a large study area, we set one station, LLS (Linth-Limmern), in the Swiss network as a reference site to obtain the corrected source spectra. Finally, we fit the source spectra with a standard ω2-model. The resulting stress drop shows a positive correlation with earthquake magnitude in the magnitude range of 2 to 4.5 and a constant value for larger magnitudes (M>4.5).