Complex rupture of the M6.3 2015 March 10 Bucaramanga earthquake: Evidence of strong weakening process

P. Poli, G. A. Prieto, C. Q. Yu, M. Florez, H. Agurto-Detzel, T. D. Mikesell, G. Chen, V. Dionicio, P. Pedraza

    Research output: Contribution to journalArticlepeer-review

    9 Scopus citations

    Abstract

    © The Authors 2016.Summary: We use seismic waves for a magnitude 6.3 intermediate-depth (160 km) earthquake in the Bucaramanga Nest, Colombia, to infer a complex rupture process with two distinct stages, characterized by different rupture velocities possibly controlled by the evolution of strength on the fault. Our integrated data processing permitted to precisely characterize the multistage rupture and the presence of a strong weakening event. The resulting seismic radiation is interpreted as resulting from an extreme weakening due to a cascading thermal shear runaway, with an initial inefficient radiation process followed by a fast and dynamic efficient rupture. Our results imply dynamic complexity of the seismic rupture deep inside the Earth, and may help to give some new insights about the physical mechanism of intermediate-depth earthquakes.
    Translated title of the contributionCompleja ruptura del M6.3 10 de marzo de 2015 Terremoto de Bucaramanga: Evidencia de un fuerte proceso de debilitamiento
    Original languageEnglish (US)
    Pages (from-to)988-994
    Number of pages7
    JournalGeophysical Journal International
    Volume205
    Issue number2
    DOIs
    StatePublished - May 1 2016

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