Structural cause of a missed eruption in the Harrat Lunayyir basaltic field (Saudi Arabia) in 2009

Ivan Koulakov, Sami El Khrepy, Nassir Al-Arifi, Pavel Kuznetsov, Ekaterina Kasatkina

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

25 Цитирования (Scopus)

Аннотация

Harrat Lunayyir is one of the most volcanically active recent basaltic fields in western Saudi Arabia. A period of substantial seismic unrest, featuring more than 30,000 local events, occurred in Harrat Lunayyir in April-June 2009. Although this crisis was presumably related to ongoing magma activity, it ended without any surface volcanic activity. We create new tomographic models of P and S velocities (VP and VS) and use them to explain the causes of this unrest and the reasons the eruption failed. A large seismic anomaly of high VP/VS ratio below 7 km depth coincides with the locations of more than 50 recent cinder cones with ages of older than 100 ka, and is interpreted as a steady-state magma reservoir. We also identify another seismic anomaly at depths below 15 km, which is interpreted as a conduit for fluids and melts from deeper sources. Because the location of this conduit is slightly outside the main reservoir, some of the incoming material was dispersed. As a result, the activation of the crustal reservoir was not sufficiently strong to pierce the rigid basaltic cover and cause an actual eruption during the crisis in 2009.

Язык оригиналаанглийский
Страницы (с-по)395-398
Число страниц4
ЖурналGeology
Том43
Номер выпуска5
DOI
СостояниеОпубликовано - 2015

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