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  Probing earthquake triggering by static and dynamic stresses at Axial Seamount

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

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020568 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020568_2
Genre: Conference Paper

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 Creators:
Tan, Yen Joe1, Author
Barkat, Adnan1, Author
Xu, Guangyu1, Author
Waldhauser, Felix1, Author
Tolstoy, Maya1, Author
Wilcock, William1, Author
Scholz, Christopher1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 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.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-3229
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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