Characteristics of secondary slip fronts associated with slow earthquakes in Cascadia
| Autor: | Quentin Bletery, R. D. Krogstad, J. C. Hawthorne, Alan W. Rempel, Amanda M. Thomas, R. M. Skarbek |
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| Přispěvatelé: | Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA), Department of Earth Sciences [Oxford], University of Oxford [Oxford], Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physical model
010504 meteorology & atmospheric sciences [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Continuous tremor [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Slip (materials science) Induced seismicity 010502 geochemistry & geophysics Geodesy 01 natural sciences Stress drop Geophysics 13. Climate action Space and Planetary Science Geochemistry and Petrology Slow earthquake [SDU]Sciences of the Universe [physics] Earth and Planetary Sciences (miscellaneous) Episodic tremor and slip Seismology Geology ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Slip rate |
| Zdroj: | Earth and Planetary Science Letters Earth and Planetary Science Letters, Elsevier, 2017, 463, pp.212-220. ⟨10.1016/j.epsl.2017.01.046⟩ |
| ISSN: | 0012-821X |
| DOI: | 10.1016/j.epsl.2017.01.046⟩ |
| Popis: | We implement an algorithm to automatically detect migrations of low frequency earthquakes at time scales between 30 min and 32 h during the 2003, 2004 and 2005 slow slip events in Cascadia. We interpret these migrations of seismicity as a passive manifestation of secondary slip fronts (SSFs) that propagate faster than the main front. We identify the dominant features of 383 SSFs, including time, location, duration, area, propagation velocity and estimate: their moment, stress drop, slip, and slip rate. We apply the same algorithm to continuous tremor detection in Cascadia between 2009 and 2015 and characterize 693 SSFs at time scales between 4 h and 32 h. We identify — to our knowledge for the first time — numerous 11–22.5 h long SSFs that propagate at velocities intermediate between slow slip events and previously reported SSFs. The systematic detection of SSFs fills a gap between seismically and geodetically detectable slow earthquake processes. Analysis of SSF basic features indicates a wide range of stress drops and slip rates (with medians of 5.8 kPa and 1.1 mm/h) as well as an intriguing relationship between SSF direction and duration that was observed in other contexts and could potentially help discriminate between the different physical models proposed to explain slow slip phenomena. |
| Databáze: | OpenAIRE |
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