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Romanian Seismic Network: Real-Time Monitoring and Shakemap Progress

Join the Euro-Mediteranean Quanterra and Antelope Users Group Meeting in Marrakech on March 11-13, 2009, to explore the Romanian Seismic Network. Learn about Linux SuSE 9.3 and Antelope 4.10, early seismic bulletins, and near real-time Shakemap advancements in Romania. Discover the extensive seismic activity monitoring with 58 stations, arrays, data analysis, and processing systems. Gain insights into ground motion estimation, USGS ShakeMap modules, and new approaches for seismic event evaluations. Explore the innovative methods, limitations, and applications of seismic data processing for Romania's seismic network.

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Romanian Seismic Network: Real-Time Monitoring and Shakemap Progress

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  1. Euro-Mediteranean Quanterra and Antelope Users Group MeetingMarrakech 11-13 March 2009 ROMANIAN SEISMIC NETWORKAnton DanetNational Institute for Earth Physics, Bucharest

  2. CONTENT • General overview of the Romanian Seismic Network • Linux SuSE 9.3 and Antelope 4.10 • How to get an early seismic bulletin • Progress towards getting a near real time shakemap

  3. Romania - seismic activity

  4. Real time seismic network 58 seismic stations and 2 arrays, BURAR and PLOR Q330 - 49 K2 - 13 Marmot - 21 Episensor - 55

  5. Dbmaster site table snapshot

  6. Plostina array

  7. SOH - Data streams latency

  8. Main computer room

  9. SOH - wfdisc table statistics

  10. orb2pf - ORB out of order packets - SuSE 9.3

  11. Estimation of processing times – SuSE 9.3 How to find out when orbevproc has terminated its job ?

  12. Shakemap status • Antelope dbgme – 2-D ground motion estimation from a database of epicenters and measurements • USGS ShakeMap - suite of processing modules Characteristics: • rely on a geological model and specific attenuation laws -> not available yet • assume a radial symmetry of the shake pattern -> not suitable for the Vrancea region New approach • Approach based on the macroseismic attenuation law derived for • Vrancea region (1) and instrumental intensity law (2) The Mathilde Soerensen macroseismic attenuation law (1) has 6 parameters and a site correction function (1)

  13. are moment magnitude, epicentral distance and depth respectively are longitude,latitude constants (6x6 table) Validity range : ( Bonjer at al., 2001) (2) The relations (1) and (2) are implemented as subroutines (get_mmi and get_pga) inside grind (ShakeMap main module)

  14. Oct 27 2004 20:34:36 M=6.0

  15. May 31, 1990 00:17:47 GMT M 6.4 May 30, 1990 10:40:06 GMT M 6.9

  16. Aug 30, 1986 21:28:37 GMT M 7.1 Mar 4, 1977 19:21:54 GMT M 7.4

  17. Some observations on the theoretical method: • valid for a small range of earthquake magnitudes • ignores site specific local conditions • acceptable results mainly for intensities • accelerations too high for magnitude greater than 6 • Approach based on observed data or observed data and computed values in between stations • - computing the acceleration and velocity at every station (orbwfmeas, orbevproc, dbwfmeas ) then transfer the data to ShakeMap (db2shakemap_xml) • - linear interpolation of data (GMT tools)

  18. Observed site accelerations

  19. Thank you for your attention

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