1 / 11

The metropolitan area of Bucharest has a population of 2.6 million people.

This study focuses on Vrancea's seismic risk and the development of an early warning system. The Romanian territory faces high earthquake risk, especially in the Vrancea area. Significant earthquakes have struck the region in the past century. Bucharest, the capital, is at high seismic risk due to its population density. The research involves earthquake locations and station data to enhance detection algorithms for real-time magnitude estimation.

buckler
Download Presentation

The metropolitan area of Bucharest has a population of 2.6 million people.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Rapid magnitude determination for Vrancea early warning system and the April 25, 2009  Ms= 5.3 event (A. Marmureanu, C. Ionescu, Gh. Marmureanu)

  2. The Romanian territory is exposed to high seismic risk associated to earthquakes occurring in Vrancea area. Major earthquakes occurred in this area in the last century: November 10, 1940, Mw=7.7, depth 150 Km; March 4,1977, Mw=7.4, depth 95 Km; August 30, 1986, Mw=7.1, depth 130 Km and May 30, 1990, Mw=6.9, depth 90 Km. The metropolitan area of Bucharest has a population of 2.6 million people. Bucharest is the 6th largest city in the European Union by population within city limits. Bucharest is one of the European cities with very high seismic risk

  3. Location of earthquakes used in this study together with the location of the stations from the epicentre (VRI,MLR,PLOR). (16183 waveforms ~3000 events).

  4. Offline applications used to tune up different algorithms

  5. Magnitude estimation absolute error (for al records and all three stations).

  6. Real time acquisitionPermits processing of offline continuous data recorded since 2004 until now via mseed2ring

  7. Detection voting scheme (our detector – a modified STA/LTA detector) VRI – Vel E 3 votes VRI – Vel N VRI – Vel Z PLOR – Vel E Magnitude computation PLOR – Vel N 3 votes 9 votes PLOR – Vel Z MLR – Vel E MLR – Vel N 3 votes MLR – Vel Z Time window

  8. Magnitude computation MVRI VRI – Acc Z MPLOR PLOR– Acc Z M=(MMLR +MPLOR +MVRI )/3 Votes on magnitude (it is decided if a final one is computed) 9 votes MMLR MLR – Acc Z

  9. Magnitude estimation absolute error (left)(for al records). Magnitude absolute errors averaged (right) (if the earthquake is recorded on all three stations, the final magnitude is the average of all local magnitudes)

  10. April 25, 2009  Ms= 5.3 event This event was correctly detected by the early warning system and a magnitude was computed in the first 5 seconds. The magnitude was overestimated with 0.22 magnitude degrees.

More Related