First-order rupture features of the 2011 MW 9.0 Tohoku (Japan) earthquake from surface waves |
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Affiliation: | 1. Dpto. Edafoloxía y Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, Rúa Lope Gómez de Marzoa s/n, Campus Vida, 15782 Santiago de Compostela, Spain;2. Instituto de Recursos Naturales y Agrobiología de Sevilla, Consejo Superior de Investigaciones Científicas, IRNAS-CSIC., Avda. Reina Mercedes 10, 41012 Sevilla, Spain;3. Institute of Bio- and Geosciences, Agrosphere (IBG-3), Forschungszentrum Jülich GmbH., Wilhelm-Johnen-Straße, 52428 Jülich, Germany;1. Department of Civil and Geological Engineering, University of Saskatchewan, Saskatoon, SK, Canada;2. The State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, ISWC, Northwest A&F University, Yangling, Shaanxi, China |
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Abstract: | This study analyzed the rupture directivity of the 2011 Tohoku earthquake by using 100-s Rayleigh-wave travel-times, influenced by the finite source, to derive the fault parameters of the earthquake. The results demonstrated that the earthquake exhibited a slow rupture propagation with a rupture velocity of approximately 1.5–2.0 km/s and asymmetric bilateral faulting. The two rupture directions were N60°E and N127°E, with rupture lengths of approximately 276 km and 231 km, respectively. The rupture toward N60°E had a source duration of approximately 183 s, longer than that toward N127°E (approximately 156 s). Overall, the entire source duration of the earthquake faulting lasted approximately 183 s. Regarding historical seismicity in eastern Japan, the 2011 Tohoku earthquake not only ruptured a locked area in which large earthquakes have rarely occurred, but also ruptured the source regions of several historical earthquakes. With the exception of its slow rupture velocity and generation of a tsunami, the rupture features of the 2011 Tohoku earthquake were inconsistent with those of typical tsunami earthquakes. |
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Keywords: | 2011 Tohoku earthquake Rupture directivity Rayleigh wave Asymmetric bilateral rupture Rupture velocity |
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