Geochronological dating and stratigraphic sequences of Harrat Lunayyir, NW Saudi Arabia

2012 ◽  
Vol 7 (20) ◽  
Author(s):  
Al-Amri A. M.
Keyword(s):  
Saudi Arabia ◽  
Harrat Lunayyir ◽  
Geochronological Dating ◽  
Stratigraphic Sequences

Post-diking deformation in Harrat Lunayyir (Saudi Arabia) from InSAR

2020 ◽  
Author(s):  
Adriano Nobile ◽  
Yunmeng Cao ◽  
Mohammad Youssof ◽  
Daniele Trippanera ◽  
Luigi Passarelli ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Ground Deformation ◽  
Earthquake Swarm ◽  
Volcanic Field ◽  
Deformation Source ◽  
Seismic Swarm ◽  
Red Sea Rift ◽  
Magmatic Intrusions ◽  
Harrat Lunayyir ◽  
Seismic Moment Release

<p>Magmatic intrusions often produce ground deformation that can be studied by geodetic techniques. In the past two decades, many volcanic dike and sill emplacements (sometimes associated to eruptions) in different tectonic settings have been analyzed through InSAR. However, in only a few cases, the post-intrusive behavior has been studied. Here we analyze the post-diking deformation in Harrat Lunayyir, which is a mononogenetic volcanic field located in western Saudi Arabia on the eastern margin of the Red Sea Rift.</p><p>Between April and July 2009, an intensive seismic swarm occurred in the area with many earthquakes above magnitude 4 and the largest earthquake of M<sub>w</sub> 5.7. InSAR data showed that the earthquake swarm was triggered by the emplacement of a dike intrusion that stopped only ~1 km below the surface. Dike length was estimated to be ~7 km and with a maximum opening 4 m. Above the intrusion, a ~10 km long and ~5 km wide graben formed during the activity with up to 1 m of fault slip on the border faults. In the post diking phase up to present, micro-sesmicity (0<Ml<3.5) has been continuously registered in the graben region gradually fading out either in terms of earthquake rate and energy release.</p><p>In February 2017, a new seismic swarm occurred ~60 km north of Harrat Lunayyir and another swarm started in October 2018, about 30 km southwest of the volcanic field. Both swarms are still ongoing with a few events per week and M<sub>l</sub><3.5. By using Sentinel-1 images, acquired during the period 2015-2019, we derived deformation rate maps for the entire Harrat Lunayyir volcanic field. No ground deformation was detected at the locations of the recent seismic swarms, and a thorough analysis of seismic signals excludes the swarms were caused by new magmatic intrusions. However, within the Harrat Lunayyir graben region, we noticed a steady and long-lasting subsidence of ~1 mm/yr. During the 2015-2019 period, the total seismic moment release would only be able to accommodate less than 0.1 mm of the observed subsidence and thus the current post-diking deformation is mainly aseismic.</p><p>In order to reconstruct the entire post-diking deformation history in Harrat Lunayyir we also analyze older available SAR images (Envisat, ALOS, TerraSAR-X, TanDEM-X). Our preliminary results show that the subsidence rate in the graben area was faster just after the intrusion (few cm in two months) but then rapidly decayed as well as the seismicity. We are now investigating different processes that can cause post-diking deformation, such as residual opening of the dike, post-diking settlement of faults and fractures, release of gases into fractures, cooling of the dike, and post-diking viscoelastic relaxation. Modelling of the deformation source will contribute to the understanding on which of these post-diking processes might be the dominant one in Harrat Lunayyir.</p>

Aeromagnetic data over Harrat Lunayyir and surrounding areas, western Saudi Arabia

2017 ◽  
Vol 10 (3) ◽  
Author(s):  
Hani M. Zahran ◽  
Sherif M. El-Hady ◽  
Helmy S. Abuelnaga
Keyword(s):  
Saudi Arabia ◽  
Aeromagnetic Data ◽  
Harrat Lunayyir ◽  
Surrounding Areas

scholarly journals Incipient status of dyke intrusion in top crust – evidences from the Al-Ays 2009 earthquake swarm, Harrat Lunayyir, SW Saudi Arabia

2013 ◽  
Vol 4 (1) ◽  
pp. 30-48 ◽  
Author(s):  
Basab Mukhopadhyay ◽  
Saad Mogren ◽  
Manoj Mukhopadhyay ◽  
Sujit Dasgupta
Keyword(s):  
Saudi Arabia ◽  
Earthquake Swarm ◽  
Dyke Intrusion ◽  
Harrat Lunayyir

scholarly journals Structural Mapping of Dike-Induced Faulting in Harrat Lunayyir (Saudi Arabia) by Using High Resolution Drone Imagery

2019 ◽  
Vol 7 ◽  
Author(s):  
Daniele Trippanera ◽  
Joël Ruch ◽  
Luca Passone ◽  
Sigurjón Jónsson
Keyword(s):  
Saudi Arabia ◽  
High Resolution ◽  
Structural Mapping ◽  
Harrat Lunayyir

scholarly journals Mantle earthquakes in recently thinned Neoproterozoic lithosphere: Harrat Lunayyir, Saudi Arabia

2020 ◽  
Author(s):  
Alexander Blanchette ◽  
Simon Klemperer ◽  
Walter Mooney ◽  
Hani Zahran
Keyword(s):  
Saudi Arabia ◽  
Harrat Lunayyir ◽  
Mantle Earthquakes

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

Geology ◽  
2015 ◽  
Vol 43 (5) ◽  
pp. 395-398 ◽  
Author(s):  
Ivan Koulakov ◽  
Sami El Khrepy ◽  
Nassir Al-Arifi ◽  
Pavel Kuznetsov ◽  
Ekaterina Kasatkina
Keyword(s):  
Saudi Arabia ◽  
Harrat Lunayyir
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