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Probing earthquake triggering by static and dynamic stresses at Axial Seamount

Authors

Tan,  Yen Joe
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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

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

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

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

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Citation

Tan, Y. J., Barkat, A., Xu, G., Waldhauser, F., Tolstoy, M., Wilcock, W., Scholz, C. (2023): Probing earthquake triggering by static and dynamic stresses at Axial Seamount, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3229


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020568
Abstract
Since 2015, when a cabled observatory was first set up on Axial Seamount, >150,000 earthquakes have been located within a 25 km³ block of crust. The volcanic system has also experienced the passage of seismic waves from >120 large remote earthquakes and periodic tidal loading. Therefore, it represents a unique laboratory for us to probe how earthquakes respond to static and dynamic stress changes. We find that the seismicity rate increases while the b-value decreases (larger proportion of large events) systematically with increasing tidal stress. The stress dependence of seismicity rate conforms to triggering theory over the whole tidal stress range, demonstrating that there is no triggering stress threshold and stress shadowing is simply a continuous function of stress decrease. We also observe statistically significant episodes of dynamic triggering for ~11% of large remote earthquakes. However, while some coincide with changes in permeability estimated from changes in the tidal phase lag of hydrothermal vent temperature, others are not. Therefore, permeability change is likely not the only mechanism underlying dynamic triggering of earthquakes.