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Local seismicity near the actively deforming Corbetti volcano in the Main Ethiopian Rift

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Local seismicity near the actively deforming Corbetti volcano in the Main Ethiopian Rift. / Lavayssière, Aude; Greenfield, Tim; Keir, Derek; Ayele, Atalay; Kendall, J. Michael.

In: Journal of Volcanology and Geothermal Research, Vol. 381, 01.09.2019, p. 227-237.

Research output: Contribution to journalArticle

Harvard

Lavayssière, A, Greenfield, T, Keir, D, Ayele, A & Kendall, JM 2019, 'Local seismicity near the actively deforming Corbetti volcano in the Main Ethiopian Rift', Journal of Volcanology and Geothermal Research, vol. 381, pp. 227-237. https://doi.org/10.1016/j.jvolgeores.2019.06.008

APA

Lavayssière, A., Greenfield, T., Keir, D., Ayele, A., & Kendall, J. M. (2019). Local seismicity near the actively deforming Corbetti volcano in the Main Ethiopian Rift. Journal of Volcanology and Geothermal Research, 381, 227-237. https://doi.org/10.1016/j.jvolgeores.2019.06.008

Vancouver

Lavayssière A, Greenfield T, Keir D, Ayele A, Kendall JM. Local seismicity near the actively deforming Corbetti volcano in the Main Ethiopian Rift. Journal of Volcanology and Geothermal Research. 2019 Sep 1;381:227-237. https://doi.org/10.1016/j.jvolgeores.2019.06.008

Author

Lavayssière, Aude ; Greenfield, Tim ; Keir, Derek ; Ayele, Atalay ; Kendall, J. Michael. / Local seismicity near the actively deforming Corbetti volcano in the Main Ethiopian Rift. In: Journal of Volcanology and Geothermal Research. 2019 ; Vol. 381. pp. 227-237.

Bibtex

@article{342ee1e4aace4aca974d7a603a955178,
title = "Local seismicity near the actively deforming Corbetti volcano in the Main Ethiopian Rift",
abstract = "Corbetti is currently one of the fastest uplifting volcanoes globally, with strong evidence from geodetic and gravity data for a subsurface inflating magma body. A dense network of 18 stations has been deployed around Corbetti and Hawassa calderas between February 2016 and October 2017, to place seismic constraints on the magmatic, hydrothermal and tectonic processes in the region. We locate 122 events of magnitudes between 0.4 and 4.2 using a new local velocity model. The seismicity is focused in two areas: directly beneath Corbetti caldera and beneath the city of Hawassa. The shallower 0–5 km depth below sea level (b.s.l.) earthquakes beneath Corbetti are mainly focused in EW- to NS-elongated clusters at Urji and Chabbi volcanic centres. This distribution is interpreted to be mainly controlled by a northward propagation of hydrothermal fluids away from a cross-rift pre-existing fault. Source mechanisms are predominantly strike-slip and different to the normal faulting away from the volcano, suggesting a local rotation of the stress-field. These observations, along with a low Vp/Vs ratio, are consistent with the inflation of a gas-rich sill, likely of silicic composition, beneath Corbetti. In contrast, the seismicity beneath Hawassa extends to greater depth (16 km b.s.l.). These earthquakes are focused on 8–10 km long segmented faults, which are active in seismic swarms. One of these swarms, in August 2016, is focused between 5 and 16 km depth b.s.l. along a steep normal fault beneath the city of Hawassa, highlighting the earthquake hazard for the local population.",
keywords = "East African rift, corbetti volcano, local seimicity, main ethiopian rift, continental tectonics",
author = "Aude Lavayssi{\`e}re and Tim Greenfield and Derek Keir and Atalay Ayele and Kendall, {J. Michael}",
year = "2019",
month = "9",
day = "1",
doi = "10.1016/j.jvolgeores.2019.06.008",
language = "English",
volume = "381",
pages = "227--237",
journal = "Journal of Volcanology and Geothermal Research",
issn = "0377-0273",
publisher = "Elsevier B.V.",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Local seismicity near the actively deforming Corbetti volcano in the Main Ethiopian Rift

AU - Lavayssière, Aude

AU - Greenfield, Tim

AU - Keir, Derek

AU - Ayele, Atalay

AU - Kendall, J. Michael

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Corbetti is currently one of the fastest uplifting volcanoes globally, with strong evidence from geodetic and gravity data for a subsurface inflating magma body. A dense network of 18 stations has been deployed around Corbetti and Hawassa calderas between February 2016 and October 2017, to place seismic constraints on the magmatic, hydrothermal and tectonic processes in the region. We locate 122 events of magnitudes between 0.4 and 4.2 using a new local velocity model. The seismicity is focused in two areas: directly beneath Corbetti caldera and beneath the city of Hawassa. The shallower 0–5 km depth below sea level (b.s.l.) earthquakes beneath Corbetti are mainly focused in EW- to NS-elongated clusters at Urji and Chabbi volcanic centres. This distribution is interpreted to be mainly controlled by a northward propagation of hydrothermal fluids away from a cross-rift pre-existing fault. Source mechanisms are predominantly strike-slip and different to the normal faulting away from the volcano, suggesting a local rotation of the stress-field. These observations, along with a low Vp/Vs ratio, are consistent with the inflation of a gas-rich sill, likely of silicic composition, beneath Corbetti. In contrast, the seismicity beneath Hawassa extends to greater depth (16 km b.s.l.). These earthquakes are focused on 8–10 km long segmented faults, which are active in seismic swarms. One of these swarms, in August 2016, is focused between 5 and 16 km depth b.s.l. along a steep normal fault beneath the city of Hawassa, highlighting the earthquake hazard for the local population.

AB - Corbetti is currently one of the fastest uplifting volcanoes globally, with strong evidence from geodetic and gravity data for a subsurface inflating magma body. A dense network of 18 stations has been deployed around Corbetti and Hawassa calderas between February 2016 and October 2017, to place seismic constraints on the magmatic, hydrothermal and tectonic processes in the region. We locate 122 events of magnitudes between 0.4 and 4.2 using a new local velocity model. The seismicity is focused in two areas: directly beneath Corbetti caldera and beneath the city of Hawassa. The shallower 0–5 km depth below sea level (b.s.l.) earthquakes beneath Corbetti are mainly focused in EW- to NS-elongated clusters at Urji and Chabbi volcanic centres. This distribution is interpreted to be mainly controlled by a northward propagation of hydrothermal fluids away from a cross-rift pre-existing fault. Source mechanisms are predominantly strike-slip and different to the normal faulting away from the volcano, suggesting a local rotation of the stress-field. These observations, along with a low Vp/Vs ratio, are consistent with the inflation of a gas-rich sill, likely of silicic composition, beneath Corbetti. In contrast, the seismicity beneath Hawassa extends to greater depth (16 km b.s.l.). These earthquakes are focused on 8–10 km long segmented faults, which are active in seismic swarms. One of these swarms, in August 2016, is focused between 5 and 16 km depth b.s.l. along a steep normal fault beneath the city of Hawassa, highlighting the earthquake hazard for the local population.

KW - East African rift

KW - corbetti volcano

KW - local seimicity

KW - main ethiopian rift

KW - continental tectonics

UR - http://www.scopus.com/inward/record.url?scp=85067853816&partnerID=8YFLogxK

U2 - 10.1016/j.jvolgeores.2019.06.008

DO - 10.1016/j.jvolgeores.2019.06.008

M3 - Article

AN - SCOPUS:85067853816

VL - 381

SP - 227

EP - 237

JO - Journal of Volcanology and Geothermal Research

JF - Journal of Volcanology and Geothermal Research

SN - 0377-0273

ER -