| Titre | Migration characteristics of seismic tremors in the northern Cascadia margin |
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| Auteur | Kao, H ; Shan, S
-J; Rogers, G; Dragert, H |
| Source | Geophysical Research Letters vol. 34, L028430, no. 3, 2007, 6p., https://doi.org/10.1029/2006gl028430 |
| Image |  |
| Année | 2007 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20060440 |
| Éditeur | Wiley-Blackwell |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1029/2006gl028430 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Région extracotière de l'ouest; Colombie-Britannique |
| SNRC | 92B; 92C; 92E; 92F; 92L; 92K; 102I; 92G; 92J |
| Région | Cascadia Subduction Zone; Île de Vancouver |
| Lat/Long OENS | -128.0000 -122.0000 51.0000 48.0000 |
| Sujets | secousses séismiques; interpretations sismiques; données sismiques; zones de subduction; sismicité; Plaque d'Explorer ; géologie structurale; tectonique |
| Illustrations | cartes de localisation; graphiques |
| Programme | Réduction des risques dus aux aléas naturels |
| Diffusé | 2007 02 09 |
| Résumé | (disponible en anglais seulement)
Seismic waveforms from a dense regional array were analyzed to study episodic tremor-and-slip (ETS) events in northern Cascadia. The April 2005 episode occurred
mostly in northern Vancouver Island (VI) where the Explorer plate subducts beneath the North America plate, while the May 2005 episode was mainly in middle VI. All tremor occurrences are positively correlated with the presence of subducted slabs.
Besides the ''steady'' along-strike migration and ''halting'' behavior found in previous ETS events, a new pattern (''jumping'') is found this time. Visual inspection of previous seismic records suggests that the jumping behavior is probably common
to ETS tremors in all regions of VI. The majority of tremors occurred between 25 and 45 km depth in places where local seismicity is sparse or absent. Our observations are compatible with the interpretation that fluids released from dehydration
of
subducted materials are involved in tremor generation. |
| GEOSCAN ID | 223044 |
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