Advertisement

Chasm at East African Suswa Rift: Possible Explanations

  • Dinesh Kumar SahadevanEmail author
  • Anand Kumar Pandey
  • Kapil Malik
  • Devika Maisnam
Short Note
  • 4 Downloads

Abstract

A chasm reported on Suswa area of African rift zone during the last week of March 2018 and widely published as “Africa is splitting”. We studied the chasm and the surrounding region using differential interferometry technique to understand the ground deformation during this period. We did not observe any significant ground deformation in the interferogram at the chasm location. Interestingly, we observed a vertical deformation of 5–7.5 cm along the line of sight of the satellite along the fault located at Mosiro, Suswa region, between March 15–27 (subsidence) and March 27–April 04, 2018 (surface uplift). We present the analyses and discuss the factors that led to the surface deformation and possible association with the reported chasm in the East African rift system.

Keywords

African rift INSAR Aseismic chasm Sentinel 

Notes

Acknowledgements

The authors would like to thank the Director NGRI for his support in the work. The authors would like to thank the SARPROZ © software for providing the trail licence. We also acknowledge use of SNAP Desktop software, Sentinel-1a, 2B satellite data, Google earth images. This work is part of publication of CSIR-NGRI Reference No. NGRI/Lib/2018/Pub-71.

References

  1. Biggs, J., Nissen, E., Craig, T., Jackson, J., & Robinson, D. P. (2010). Breaking up the hanging wall of a rift-border fault: The 2009 Karonga earthquakes, Malawi. Geophysical Research Letters, 37(11), 67.CrossRefGoogle Scholar
  2. Bozzano, F., Esposito, C., Franchi, S., Mazzanti, P., Perissin, D., Rocca, A., et al. (2015). Understanding the subsidence process of a quaternary plain by combining geological and hydrogeological modelling with satellite InSAR data: The Acque Albule Plain case study. Remote Sensing of Environment, 168, 219–238.CrossRefGoogle Scholar
  3. d’Oreye, N., González, P. J., Shuler, A., Oth, A., Bagalwa, L., Ekström, G., et al. (2011). Source parameters of the 2008 Bukavu–Cyangugu earthquake estimated from InSAR and teleseismic data. Geophysical Journal International, 184(2), 934–948.CrossRefGoogle Scholar
  4. Ebinger, C., Ayele, A., Keir, D., Rowland, J., Yirgu, G., Wright, T., et al. (2010). Length and timescales of rift faulting and magma intrusion: the Afar rifting cycle from 2005 to present. Annual Review of Earth and Planetary Sciences, 38(1), 439–466.CrossRefGoogle Scholar
  5. Elachi, C. (1988). Spaceborne radar remote sensing: Applications and techniques (p. 285). New York: IEEE Press.Google Scholar
  6. Goldstein, R. M., & Werner, C. L. (1998). Radar interferogram filtering for geophysical applications. Geophysical Reseach Letters, 25, 4035–4038.CrossRefGoogle Scholar
  7. Hamling, I. J., Wright, T. J., Calais, E., Lewi, E., & Fukahata, Y. (2014). InSAR observations of post-rifting deformation around the Dabbahu rift segment, Afar, Ethiopia. Geophysical Journal International, 197(1), 33–49.CrossRefGoogle Scholar
  8. Hanssen, R. F. (2001). Radar interferometry: Data interpretation and error analysis (Vol. 2) Springer Science & Business Media.Google Scholar
  9. Pagli, C., Wang, H., Wright, T. J., Calais, E., & Lewi, E. (2014). Current plate boundary deformation of the Afar rift from a 3-D velocity field inversion of InSAR and GPS. Journal of Geophysical Research: Solid Earth, 119(11), 8562–8575.Google Scholar
  10. Perissin, D., Wang, Z., & Wang, T. (2011). The SARPROZ InSAR tool for urban subsidence/manmade structure stability monitoring in China. In Proceedings of the ISRSE. Sidney (p. 1015).Google Scholar
  11. Stamps, D. S., Saria, E., & Kreemer, C. (2018). A geodetic strain rate model for the East African Rift system. Scientific reports, 8(1), 732.CrossRefGoogle Scholar
  12. Vigny, C., de Chabalier, J. B., Ruegg, J. C., Huchon, P., Feigl, K. L., Cattin, R., et al. (2007). Twenty-five years of geodetic measurements along the Tadjoura-Asal rift system, Djibouti, East Africa. Journal of Geophysical Research: Solid Earth.  https://doi.org/10.1029/2004JB003230.Google Scholar
  13. Wdowinski, S., Kim, S. W., Amelung, F., Dixon, T. H., Miralles-Wilhelm, F., & Sonenshein, R. (2008). Space-based detection of wetlands’ surface water level changes from L-band SAR interferometry. Remote Sensing of Environment, 112(3), 681–696.CrossRefGoogle Scholar
  14. Zebker, H. A., & Goldstein, R. M. (1986). Topographic mapping from interferometric synthetic aperture radar observations. Journal of Geophysical Research: Solid Earth, 91(B5), 4993–4999.CrossRefGoogle Scholar
  15. Zhou, X., Chang, N. B., & Li, S. (2009). Applications of SAR interferometry in earth and environmental science research. Sensors, 9(3), 1876–1912.CrossRefGoogle Scholar

Copyright information

© Indian Society of Remote Sensing 2019

Authors and Affiliations

  1. 1.CSIR-National Geophysical Research InstituteHyderabadIndia
  2. 2.Department of Mining EngineeringIndian Institute of Technology (ISM)DhanbadIndia

Personalised recommendations