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

doi:10.1093/gji/ggw065

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

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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 contribution	Compleja ruptura del M6.3 10 de marzo de 2015 Terremoto de Bucaramanga: Evidencia de un fuerte proceso de debilitamiento
Original language	English (US)
Pages (from-to)	988-994
Number of pages	7
Journal	Geophysical Journal International
Volume	205
Issue number	2
DOIs	https://doi.org/10.1093/gji/ggw065
State	Published - May 1 2016

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

abstract = "{\textcopyright} 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.",

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T1 - Complex rupture of the M6.3 2015 March 10 Bucaramanga earthquake: Evidence of strong weakening process

AU - Poli, P.

AU - Prieto, G. A.

AU - Yu, C. Q.

AU - Florez, M.

AU - Agurto-Detzel, H.

AU - Mikesell, T. D.

AU - Chen, G.

AU - Dionicio, V.

AU - Pedraza, P.

PY - 2016/5/1

Y1 - 2016/5/1

N2 - © 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.

AB - © 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.

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DO - 10.1093/gji/ggw065

M3 - Article

SN - 0956-540X

VL - 205

SP - 988

EP - 994

JO - Geophysical Journal International

JF - Geophysical Journal International

IS - 2

ER -

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

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