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<html xmlns=""> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href=""> <link rel="stylesheet" href=""> <link rel="stylesheet" href=""> <script src=""></script> <script src=""></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src=""><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">Romanian Reports in Physics, Vol. 60, No. 1, P. 131&#8211;144, 2008</div><div class="t m0 x2 h3 y2 ff2 fs1 fc0 sc0 ls0 ws0">ESTIMATION OF THE LOCAL RESPONSE USING</div><div class="t m0 x1 h3 y3 ff2 fs1 fc0 sc0 ls0 ws0">THE NAKAMURA METHOD FOR THE BUCHAREST AREA</div><div class="t m0 x3 h4 y4 ff3 fs2 fc0 sc0 ls0 ws0">&#59024;</div><div class="t m0 x4 h5 y5 ff2 fs0 fc0 sc0 ls0 ws0">BOGDAN ZAHARIA, MIRCEA RADULIAN, MIHAELA POPA, BOGDAN GRECU,</div><div class="t m0 x5 h5 y6 ff2 fs0 fc0 sc0 ls0 ws0">ANDREI BALA, DRAGOS TATARU</div><div class="t m0 x6 h2 y7 ff1 fs0 fc0 sc0 ls0 ws0">National Institute for Earth Physics, 12 Calugareni St., 077125, P.O. Box MG<span class="_ _0"></span>-2 Magurele, Romania,</div><div class="t m0 x7 h2 y8 ff1 fs0 fc0 sc0 ls0 ws0">Tel.: +4021 493 01 17, Fax: +4021 493 00 53</div><div class="t m0 x8 h5 y9 ff2 fs0 fc0 sc0 ls0 ws0">(Received September 20, 2006)</div><div class="t m0 x9 h5 ya ff1 fs0 fc0 sc0 ls1 ws0">Abstract.<span class="_ _1"> </span><span class="ff2 ls2 ws1">Bucharest is one of the most affected cities by earthquakes in Europe. Situated <span class="_ _2"></span>at</span></div><div class="t m0 x1 h5 yb ff2 fs0 fc0 sc0 ls3 ws2">150&#8211;170 km distance from the Vrancea epicentral zone, Bucharest has suffered <span class="_ _2"></span>many damages due to</div><div class="t m0 x1 h5 yc ff2 fs0 fc0 sc0 ls2 ws3">high energy Vrancea intermediate-depth earthquakes. For example, the 4 March 1977 event produced</div><div class="t m0 x1 h5 yd ff2 fs0 fc0 sc0 ls4 ws4">the collapse of 32 buildings with 8&#8211;12 levels, while more than 150 old buildings with 6&#8211;9 levels were</div><div class="t m0 x1 h5 ye ff2 fs0 fc0 sc0 ls3 ws5">seriously damaged. The studies done after this earthquake showed the importance of the surface</div><div class="t m0 x1 h5 yf ff2 fs0 fc0 sc0 ls3 ws6">geological structure upon ground motion parameters. Bonjer<span class="ff1 ls5 ws7"> et al.</span><span class="ls4 ws8"> (1999) used for estimation of the</span></div><div class="t m0 x1 h5 y10 ff2 fs0 fc0 sc0 ls6 ws9">local response the seismic noise recorded at 16 stations in Bucharest. The results showed that the H/V</div><div class="t m0 x1 h5 y11 ff2 fs0 fc0 sc0 ls6 wsa">spectral ratios obtained for the 16 sites are <span class="ls7 wsb">dominated by a clear resonance peak between 1 and 2</span></div><div class="t m0 x1 h5 y12 ff2 fs0 fc0 sc0 ls0 ws0">seconds and their amplitudes remain constant around the value of 2.</div><div class="t m0 x9 h5 y13 ff2 fs0 fc0 sc0 ls4 wsc">Our purpose is to extend the Bonjer<span class="ff1 ls2 wsd"> et al</span><span class="ls8 wse">. (1999) study using new data acquired in 2002 on</span></div><div class="t m0 x1 h5 y14 ff2 fs0 fc0 sc0 ls6 ws9">20 sites in Bucharest. The <span class="_ _3"></span>measurements were done with a K2 digital station equipped with a velocity</div><div class="t m0 x1 h5 y15 ff2 fs0 fc0 sc0 ls6 wsf">sensor having the natural period <span class="_ _3"></span>of 5 seconds. For computation of the spectral ratios using</div><div class="t m0 x1 h5 y16 ff2 fs0 fc0 sc0 ls9 ws10">Nakamura&#8217;s method (1989) the JSESAME software developed within the European project SESAME</div><div class="t m0 x1 h5 y17 ff2 fs0 fc0 sc0 lsa ws11">( was used. The obtained ratios confirm the previous results,</div><div class="t m0 x1 h5 y18 ff2 fs0 fc0 sc0 lsa ws11">showing a dominant resonance in the period range of 1&#8211;2 seconds. The average <span class="_ _2"></span>period of these</div><div class="t m0 x1 h6 y19 ff2 fs0 fc0 sc0 ls2 ws12">maxima is 1.47 <span class="_ _4"></span><span class="ff4 ls0 ws0">r<span class="ff2 ls3 ws13"> <span class="_ _4"></span>0.20 <span class="_ _4"></span>s, while the average amplitude is 2.5. Our results bring evidence of the</span></span></div><div class="t m0 x1 h5 y1a ff2 fs0 fc0 sc0 lsb ws14">applicability of the ambient noise measurements and their relevance for the microzonation</div><div class="t m0 x1 h5 y1b ff2 fs0 fc0 sc0 ls0 ws0">assessment studies in the Bucharest area.</div><div class="t m0 x9 h5 y1c ff1 fs0 fc0 sc0 ls0 ws15">Key words:<span class="_ _5"> </span><span class="ff2 ls7 ws16">fundamental period of resonance, seismic microzonation, Nakamura technique,</span></div><div class="t m0 xa h5 y1d ff2 fs0 fc0 sc0 ls0 ws0">site effects.</div><div class="t m0 xb h7 y1e ff5 fs3 fc0 sc0 ls0 ws0">INTRODUCTION</div><div class="t m0 x9 h8 y1f ff2 fs3 fc0 sc0 lsc ws17">The behavior of the ground motion during an earthquake is generally well</div><div class="t m0 x1 h8 y20 ff2 fs3 fc0 sc0 lsd ws18">explained by the geological surface structure in the place where the phenomenon</div><div class="t m0 x1 h8 y21 ff2 fs3 fc0 sc0 lse ws19">is studied<span class="fc1 ls0 ws0">.</span><span class="lsf ws1a"> Past and recent observations have shown that the <span class="_ _2"></span>damage caused by</span></div><div class="t m0 x1 h8 y22 ff2 fs3 fc0 sc0 lsf ws1b">strong earthquakes are more important in sedimentary basins than on hard rock</div><div class="t m0 x1 h8 y23 ff2 fs3 fc0 sc0 lse ws0">structures.</div><div class="t m0 x9 h9 y24 ff3 fs4 fc0 sc0 ls0 ws0">&#59024;</div><div class="t m0 xc h5 y25 ff2 fs0 fc0 sc0 ls3 ws1c"> Paper presented at the Annual Scientific Conference, May 26, 2006, Faculty <span class="_ _2"></span>of Physics,</div><div class="t m0 x1 h5 y26 ff2 fs0 fc0 sc0 ls0 ws0">Bucharest University, Romania.</div></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div> </body> </html>
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