TY  - JOUR
A1  - Sharma, Shubham
A1  - Hainzl, Sebastian
A1  - Zöller, Gert
T1  - Seismicity parameters dependence on main shock-induced co-seismic stress
T2  - Geophysical journal international
N2  - The Gutenberg-Richter (GR) and the Omori-Utsu (OU) law describe the earthquakes' energy release and temporal clustering and are thus of great importance for seismic hazard assessment. Motivated by experimental results, which indicate stress-dependent parameters, we consider a combined global data set of 127 main shock-aftershock sequences and perform a systematic study of the relationship between main shock-induced stress changes and associated seismicity patterns. For this purpose, we calculate space-dependent Coulomb Stress (& UDelta;CFS) and alternative receiver-independent stress metrics in the surrounding of the main shocks. Our results indicate a clear positive correlation between the GR b-value and the induced stress, contrasting expectations from laboratory experiments and suggesting a crucial role of structural heterogeneity and strength variations. Furthermore, we demonstrate that the aftershock productivity increases nonlinearly with stress, while the OU parameters c and p systematically decrease for increasing stress changes. Our partly unexpected findings can have an important impact on future estimations of the aftershock hazard.
KW  - Earthquake hazards
KW  - Earthquake interaction
KW  - forecasting
KW  - and prediction
KW  - Statistical seismology
KW  - b-value
Y1  - 2023
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/64318
SN  - 0956-540X
SN  - 1365-246X
VL  - 235
IS  - 1
SP  - 509
EP  - 517
PB  - Oxford Univ. Press
CY  - Oxford
ER  -