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Recent Seismicity and Rapid Response in Ethiopia

Recent Seismicity and Rapid Response in Ethiopia. Atalay Ayele Institute of Geophysics Space Science and Astronomy, Addis Ababa University (Ethiopia). Contents. Backgrounds Status of Ethiopian Seismic Station Network Recent seismicity and experiences in rapid response

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Recent Seismicity and Rapid Response in Ethiopia

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  1. Recent Seismicity and Rapid Response in Ethiopia AtalayAyele Institute of Geophysics Space Science and Astronomy, Addis Ababa University (Ethiopia) SDR imitative (CEA), Beijing 2019

  2. Contents • Backgrounds • Status of Ethiopian Seismic Station Network • Recent seismicity and experiences in rapid response • Challenges in earthquake and volcanic risk mitigation in Ethiopia • Conclusions SDR imitative (CEA), Beijing 2019

  3. Backgrounds The most evolved part of EARS Prototype Ultra slow spreading oceanic ridge Meghraoui et al., 2016 SDR imitative (CEA), Beijing 2019

  4. Backgrounds … • Red dots represent earthquake epicenters with magnitude being proportional to the size of the circle • White stars represent capital cities • yellow stars show major towns in Ethiopia Arabia plate 1.8-2cm/year Nubia Plate 5-6 mm/year Somalia Plate Farming and animal herding and hence settlement more favorable around the rift BUT SDR imitative (CEA), Beijing 2019

  5. M ≥ 6.8 Backgrounds … Risk is growing with less awareness SDR imitative (CEA), Beijing 2019

  6. Backgrounds ... Ayele et al., 2009 Belachew et al., 2011 SDR imitative (CEA), Beijing 2019

  7. Seismic station network • Seismic monitoring in Ethiopia started in 1959 • AAE remained as one of the world best stations in data quality and continuity of operation Inauguration of AAE in 1962 as one of the WWSSN station and dignitaries and engineers were from AAU, USGS and the US embassy in Addis Ababa SDR imitative (CEA), Beijing 2019

  8. Current seismic Station Network … A total of 9 stations DESE SEME GERD WELM GERD ANKE HARA Two more standby stations AAE WELM FURI DILA SDR imitative (CEA), Beijing 2019

  9. Current seismic station network • FURI (Ethiopia) • AAE (Ethiopia) • DESE (Ethiopia) • HARA (Ethiopia) • ANKE (Ethiopia) • BEKJ (RiftVolk project) • MBAR (Uganda) • ATD (Djibouti) • KMBO (Kenya) • LODK (Kenya) • RAYN (Saudi Arabia) All these stations generate helicorders on daily basis SDR imitative (CEA), Beijing 2019

  10. 16 people died and 253 were injured (daily mail) SDR imitative (CEA), Beijing 2019

  11. Monitoring regional earthquake activities SDR imitative (CEA), Beijing 2019

  12. Recent seismicity & rapid responseMarch/April 2015 Fentale swarm BAHI SEME DESE ANKE AAE NEKE SABU FURI Clear anisotropy is visible at SABU station GINR DILA SDR imitative (CEA), Beijing 2019

  13. Recent seismicity & rapid response • The most reported on the media • There was panic and death due to lack of awareness on how to behave during earthquake crisis Wilks et al., 2017) SDR imitative (CEA), Beijing 2019

  14. Recent seismicity & rapid response 18-21/01/2017 NASA image 04/12/2016 4.6 (ML) 27/01/2017 5.3 Mw SDR imitative (CEA), Beijing 2019

  15. Recent seismicity & rapid response SDR imitative (CEA), Beijing 2019

  16. Challenges 10% probability of exeedance in 50 years 2% probability of exeedance in 50 years Ayele (2017) • historical catalogue • Instrumental catalogue • active Fault Mapping/earthquake geology • Strain Rate • GMPE etc BUT SDR imitative (CEA), Beijing 2019

  17. Challenges … Bekoji station Frequent power and connectivity failure SDR imitative (CEA), Beijing 2019

  18. Challenges … • Government manages crisis instead of risk • Capacity building • outreach • Episodic international collaborations for naturally episodic activities • We are missing science b/se of lack of funding for rapid response but risk management, we never had catastrophic event so far and we are not prepared SDR imitative (CEA), Beijing 2019

  19. Conclusions • Update the seismic hazard map and the building code from the most we can get out of the data • Enforce the code by legislation • Build capacity in real-time monitoring & communicate results to the concerned when necessary • Establish a reliable civil protection authority in the country • Government attention is episodic and dangerous for developing mitigation capacity in the country SDR imitative (CEA), Beijing 2019

  20. Acknowledgements ISP (International Science Program) of Uppsala University for supporting our seismological activity SDR imitative (CEA), Beijing 2019

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