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Experience Database of Romanian Facilities Subjected to the Last Three Vrancea Earthquakes

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Experience Database of Romanian Facilities Subjected to the Last Three Vrancea Earthquakes XA9952878 Title: Experience Database of Romanian Facilities Subjected to the Last Three Vrancea Earthquakes Contributor: Stevenson & Associates Date: March 1995 STEVENSON & ASSOCIATES Faurei # 1, Bloc P11, Ap.80, Sector 1 Bucharest, Phone/Fax: (401) 211-3783 Registration no. J 40/27689/1993, Fiscal cod: 5042040 Account (lei): 4104085154538. Account ($): 4154085154538. Dacia Felix-Sa Bank, Sue. Bucuresti Research Report for the International Atomic Energy Agency Vienna, Austria Contract No. 8223/EN EXPERIENCE DATABASE OF ROMANIAN FACILITIES SUBJECTED TO THE LAST THREE VRANCEA EARTHQUAKES Parti Probabilisitic hazard analysis to the Vrancea earthquakes in Romania. by Dan Lungu1} and Ovidiu Coman2) with cooperation of: Alexandru Aldea !) Tiberiu Cornea ^ lolanda Craifaleanu 5) Traian Moldoveanu4) Mihaela Rizescu3) 1) Technical University of Civil Engineering, Bucharest 2) Stevenson & Associates, Bucharest Office 3) National Institute for Earth Physics, INFP 4) Institute for Geotechnical and Geophysical Studies, GEOTEC 5) lPCT-SA This page is intentionally left blank. Contents: 1. Introduction 2. The Vrancea source References 3. Probabilistic seismic hazard evaluation 3.1 Magnitude-recurrence relationship 3.2 Ground motion attenuation References 4. Site-dependent response spectra for design 4.1 Site dependent frequency content of the accelerograms 4.2 Bucharest narrow frequency band motions of long predominant period and design spectra for soft soil condition 4.3 Moldavia and Republic of Moldavia response spectra 4.4 Response spectra for motions recorded in Dobrogea References 5. Appendix 1: Characteristics of free-field accelerograms recorded in the last three Vrancea earthquakes by the seismic networks of INFP and GEOTEC 6. Acknowledgment This page is intentionally left blank. 1. INTRODUCTION The scope of this research project is to use the past seismic experience of similar components from power and industrial facilities to establish the generic seismic resistance of nuclear power plant safe shutdown equipment. The first part of the project provide information about the Vrancea earthquakes which affect the Romanian territory and also the Kosloduy NPP site as a background of the investigations of the seismic performance of mechanical and electrical equipment in the industrial facilities. This project has the following objectives: a) first part : - Collect and process all available seismic information about Vrancea earthquakes; - Perform probabilistic hazard analysis of the Vrancea earthquakes; - Determine attenuation low, correlation between the focal depth, earthquake power, soil conditions and frequency characteristics of the seismic ground motion b) second part: - Investigate and collect information regarding seismic behavior during the 1977, 1986 and 1990 earthquakes of mechanical and electrical components from industrial facilities. The seismic database used for the analysis of the Vrancea earthquakes includes digitized triaxial records as follows: March 4, 1977 - 1 station, Aug. 30 1986 - 42 stations, May 1990 - 54 stations. Also a catalogue of the Vrancea earthquakes occurred during the period 1901-1994, is presented. The present report represent the first part of the research project. This page is intentionally left blank. 2. THE VRANCEA SOURCE The Vrancea region, situated where the Carpathian Arc bends, is the source of an intermediate depth (60-170 km) seismic activity. It affects more than 2/3 of the territory of Romania, important parts of the Republic of Moldova and a small area in Bulgaria. The Vrancea intermediate depth foci produce a high seismic risk in the densely built zones of the South-East of Romania. In Bucharest, on March 4, 1977, during the strongest Vrancea earthquake in the last 50 years, more than 1500 people died and 35 reinforced concrete multi-storey buildings completely collapsed. However the Vrancea region is a source of smaller seismic risk when compared with the seismic risk in Turkey (57,757 dead people in destructive earthquakes that occurred from 1925 to 1988) or in Greece. From EUROPROBE's LEVISP and DECAP Reports, the Vrancea region in Romania can be characterised as follows: The Carpathian Arc is bounded on the North and North-East by the East European Platform and on the East and South by the Moesian Platform; inside the Arc and Westward are the Transylvanian and Pannonian basins, Fig. 2.1. 0 50 100km i ' ' ' i Fig. 2.1 Tectonic units in the Vrancea region - Romania Focus Moment Gutenberg- The three tectonic units in contact depth magnitude Richter along the Eastern Carpathians have different km magnitude crustal and lithospheric thickness, heat flow Mw M and other physical properties as well as o - different relative motions. Crustal seismic The thickness of the lithosphere varies 20 -- 5.5 activity between about 150 km in the platform areas and less than 100 km inside the Carpathians. 40 . No seismic In the Vrancea zone the lithosphere activity descends to more than 200 km and is located 60 - at about 30-40 km in the platform areas, 40- 6.8 6.5 1945 Sept 07 55 km in the Carpathians area and 25-30 km 6.3 6.1 1990 May 31 80 - in the basin areas. 7.0 6.7 1990 May 30 The intermediate depth foci are 100 - clustered in a narrow volume: about 20 km in 7.5 7.2 1977 Mar 04 the SE-NW direction, 60 km in the NE-SW 6.8 6.5 1940 Oct 22 120 - direction and 100 km in depth. 7.2 7.0 1986 Aug30 140 - 7.7 7.4 1940 Novll 7.0 6.8 1908 Oct 06 The mechanism of the Vrancea source 160 - was explained by Fuchs et al. (1979): 180 - Deepest event First a subduction zone was 4.0 recorded 200 - recognised in the Eastern Carpathians in the 1982 May 16 SE-NW direction, later a paleosubduction zone in the NE-SW direction with its Southern end decoupled. Fig. 2.2 Vrancea intermediate depth events (Mw> 6.8) Adapted from EUROPROBE's DECA Project Nevertheless, from several tectonic models proposed none of them can explain all the particularities of the Vrancea observed seismic activity : spatial distribution of seismic activity, the two types of orientation of the fault plane, etc. (EUROPROBE). The C. Radu Catalogue of the earthquakes (M > 5.0) which occurred in the Vrancea zone from 1901 to 1994 is listed in Table 2.1. The magnitude in Catalogue is the Gutenberg- Richter magnitude (1954). This magnitude could be approximated as equal to the surface magnitude (Bonjer, 1991): M = Ms. Conversion of the Gutenberg-Richter magnitude M > 5.0 into the moment magnitude Mw can be done using the relation proposed, for the Vrancea source, by Oncescu (1987): Mw= 0.92 M +0.81. (2.1) Table 2.1 Catalogue of the Vrancea earthquakes (M £ 5.0) occurred on the territory of Romania during the period 1901 - 1994 (C. Radu, 1994) Nr. Date Time Lat. Long. Focus depth lo Gutenberg- GMT h Epicentral Richter h.m.s N° E° km intensity magnitude 1 1901 Sep 23 18:11 45.7 26.6 i V 5.0 2 1902 Mar 11 20:14 45.7 26.6 i VI 5.5 3 1903 Jun08 15:07 45.7 26.6 i VI 5.0 4 Sep 13 08:02:7 45.7 26.6 i VII 6.3 5 1904 Feb 06 02:49 45.7 26.6 i VI 5.7 6 1908 Oct 06 21:39:8 45.5 26.5 150 VIII 6.8 7 1912 May 25 18:01:7 45.7 27.2 80 VII 6.0 8 May 25 20:15 45.7 27.2 80 VI 5.5 9 May 25 21:15 45.7 27.2 80 V-VI 5.3 10 Jun 07 01:58 45.7 27.2 80 V 5.0 11 1913 Mar 14 03:40 45.7 26.6 i V-VI 5-3 12 M23 22:03 45.7 26.6 i V-VI 5.3 13 1914 Jul 01 01:00 45.7 26.6 i V 5.0 14 Jul31 18:23:12 45.9 26.3 100 V-VI 5.3 15 Oct 26 02:59 45.7 26.6 i V 5.0 16 1917 Mar 15 20:42:46 46.0 26.5 i V 5.0 17 May 19 21:00 45.7 26.6 i VI 5.5 18 Mil 03:23:55 45.7 26.6 i VI 5.5 19 1918 Feb 25 02:07 45.7 26.6 i VI 5.5 20 1919 Apr 18 06:20:05 45.7 26.6 100 VI 5.3 21 Aug09 14:38 45.7 26.6 i VI 5.5 22 1925 Dec 25 02:37 45.7 26.6 i V 5.0 23 1927 Jul 24 20:17:05 45.7 26.6 i VI 5.5 24 1928 Mar 30 09:38:57 45.9 26.5 i VI 5.4 25 Nov23 04:23:12 45.7 26.6 150 V-VI 5.3 26 1929 May 20 12:17:56 45.8 26.5 100 VI 5.3 27 NovOl 06:57:25 45.9 26.5 160 VI-VII 5.8 28 1932 Mar 13 02:53 45.7 26.6 i V-VI 5.3 29 May 27 10:42:15 45.7 26.6 i VI 5.5 30 Sep 07 18:36 45.7 26.6 i VI 5.4 31 1934 Feb 02 10:59:13 45.2 26.2 150 VI 5.3 32 Mar 29 20:06:51 45.8 26.5 90 VII 6.3 33 1935 Jul 13 00:03:46 45.3 26.6 140 VI 5.3 34 Sep 05 06:00 45.8 26.7 150 VI 5.5 35 1936 May 17 17:38:02 45.3 26.3 150 V 5.1 36 1937 Jan 26 14:34 45.7 26.6 i V 5.0 37 1938 Jul 13 20:15:17 45.9 26.7 120 VI 5.3 38 1939 Sep 05 06:02:00 45.9 26.7 115 VI 5.3 39 1940 Jun 24 09:57:27 45.9 26.6 115 V-VI 5.5 40 Oct 22 06:37:00 45.8 26.4 122 VII - VIII 6.5 41 Nov08 12:00:44 45.5 26.2 145 VI 5.5 42 Nov 10 01:39:07 45.8 26.7 150 IX 7.4 43 Novll 06:34:16 46.0 26.8 150 VI 5.5 44 Nov 14 14:37 45.7 26.6 i V 5.0 45 Nov 19 20:27:12 46.0 26.5 150 VI 5.3 46 Nov 23 14:49:53 45.8 26.8 150 V-VI 5.3 47 Dec 01 17:19 45.7 26.6 i V 5.1 48 1941 Jan 29 07:04 45.7 26.6 i V 5.1 49 1942 Apr 13 03:07:22 45.7 26.5 100 V-VI 5.2 50 Jul 29 19:19 45.7 26.5 125 V 5.0 51 1943 Apr 28 19:46:40 45.8 27.1 66 VI 5.0 10 Nr.
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