EGU2020-8272
https://doi.org/10.5194/egusphere-egu2020-8272
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

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

Adriano Nobile, Yunmeng Cao, Mohammad Youssof, Daniele Trippanera, Luigi Passarelli, and Sigurjón Jónsson
Adriano Nobile et al.
  • King Abdullah University of Science and Technology - KAUST - Earth Science and engineering, Thuwal, Saudi Arabia (adriano.nobile@kaust.edu.sa)

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.

Between April and July 2009, an intensive seismic swarm occurred in the area with many earthquakes above magnitude 4 and the largest earthquake of Mw 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.

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 Ml<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.

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.

How to cite: Nobile, A., Cao, Y., Youssof, M., Trippanera, D., Passarelli, L., and Jónsson, S.: Post-diking deformation in Harrat Lunayyir (Saudi Arabia) from InSAR, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-8272, https://doi.org/10.5194/egusphere-egu2020-8272, 2020

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Presentation version 1 – uploaded on 03 May 2020
  • CC1: Questions and answers from the live chat during EGU2020, Michael Heap, 11 May 2020

    Q: Very interesting. What is the origin of the post-diking deformation? Magma cristallisation? Viscous relaxation of the crust?

    A: Viscoelastic relaxation is one of the hypotheses. Another could be the gravitational settlelment

    Q: Do you see any lengthening of the faults at the surface with post-dike subsidence?

    A: I didn't check but with the CSK resolution could be interesting to look at it. Currently, I am evaluating DEMs and probably I can work with the coherence

    Q: Interesting longer-term deformation perspective! What is the average depth of the earthquakes for the period from 2015 to 2019? Or is it too difficult to estimate due to low Mag and poor location?

    A: Generally are 2-5 km deep, from the Saudi Geological Service catalog. Currently there is a large seismic network improved after the last seismic swarms in 2017 and 2018