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Seismic Network Contribution for Earthquake Monitoring in Athens

The Seismological Laboratory of the National & Kapodistrian University of Athens contributes to real-time and offline seismic monitoring. This study presents network approach examples, earthquake locations, slip models, and array processing results for earthquakes in the Athens test site.

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Seismic Network Contribution for Earthquake Monitoring in Athens

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  1. ATHENS TEST SITE Contribution of the Seismological Laboratory National & Kapodistrian University of Athens

  2. ATHENS TEST SITE

  3. KALI PLAT LAKA AKOR Strong & Weak Motion Network White: Seismographs in real-time transmission, Red: Seismographs in offline mode, Blue: Accelerographs in dial-up mode.

  4. Network approach example Picking and associating phases

  5. Earthquake locations for earthquakes with M>3 for the period (September 2007 – March 2008) White: traditionally picked and located events Black: automatic picked and associated events and Tnow located

  6. The June 8 2008 (12:25 GMT), Andravida earthquake of magnitude Mw=6.4. Location and rupture zone

  7. The calculated slip model revealed more than one seismic sources (Agalos A.) Synthetic PGV map plus relocated seismicity (Papadimitriouet al)

  8. recording at Rodini station 2 s pre-rupture, period ~ 0,6  M=5.2 3 s period ~ 1.4  M=6.7 Instantaneous period estimation at Rodini station Kanamori & Wu

  9. TRISAR and MALES arrays • REFTEK DAS 72 • CMG-40T-1s • GURALP DM24 Mark III • CMG-40T-30s

  10. Array processing scheme developed by NORSAR and implemented by NKUA for the Athens test site

  11. Andravida Mw=6.4 earthquake.

  12. Array processing results for the June 6, 2008 Andravida Mw=6.4 earthquake.

  13. Aftershock activity

  14. February 4, 2008 M=5.0 earthquake

  15. Array processing results for the February 4, 2008 M=5.0 earthquake

  16. Limiting factors of array performance • Temporary nature of installation • Timing errors resulting from the absence of a common timing system • Complexity and variations of crustal structure in the area. • Improvement of travel time tables or location corrections according to azimuth • Further tuning of single and multi array location algorithms is needed

  17. Future prospects • Continuation of EW algorithm testing using the increasing number of real-time stations becoming available near the test site area and installing accelerometers in tandem. • Activating real time transmission of RASMON accelerometer network. • Improving latency times • Re-initiate array related activities provided that a common time base system can be established.

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