Pub Date : 2021-03-22DOI: 10.5592/CO/1CROCEE.2021.253
Tvrtko Korbar, S. Markušić, D. Stanko, D. Penava
On 29 December 2020 devastating M6.2 earthquake hit well known Petrinja epicentral area, and caused strong damage on many buildings in Petrinja, Sisak, and Glina, as well as on solid modern linear infrastructure (roads, bridges, artificial river embankments, pipelines etc.). The seismic hazard is not depending only on the estimated coseismic ground acceleration that should be used for EUROCODE 8 constructional seismic design, but is also strongly dependent on local soil effects and on the secondary effects of a strong earthquake (landslides, liquefaction, suffosion, etc.). Besides, movement of the crustal blocks along the fault lines that cross the solid objects, in case of surface coseismic rupture such was the Petrinja event, should be evaluated. Local site amplification effects are the results of several physical processes (multiple reflections and diffractions, focusing, resonance, wave trapping) in the overlying superifical deposits and soil, resulting in variable damage distribution that were observed in different local geological units affected by an earthquake. Also, the variable surface topography and various mechanical properties of the terrain such as water table, slopes, presence of heterogeneities, structural discontinuities and cavities, certainly can contribute to the observed damage and increase geological hazard in epicentral area. How many unknown active faults we can identified in Croatia? What could be surface manifestation of a strong earthquake that will occure on a shallow thrust (reverse) fault? Is there any major normal active fault that can surprise seismotectonic experts and civil engineers? The authors published first scientific paper after the Zagreb 22 March 2020 event and are currently working on active tectonics in Kvarner region and Hrvatsko Zagorje. Besides, a new Croatian Science Foundation (HRZZ) project has just been started with special attention on soil dynamic properties and its influence on the seismic hazard of the older cultural buildings in Trakošćan, Šibenik and Dubrovnik.
{"title":"PETRINJA M6.2 EARTHQUAKE IN 2020 DAMAGED ALSO SOLID LINEAR INFRASTRUCTURE: ARE THERE SIMILAR ACTIVE FAULTS IN CROATIA?","authors":"Tvrtko Korbar, S. Markušić, D. Stanko, D. Penava","doi":"10.5592/CO/1CROCEE.2021.253","DOIUrl":"https://doi.org/10.5592/CO/1CROCEE.2021.253","url":null,"abstract":"On 29 December 2020 devastating M6.2 earthquake hit well known Petrinja epicentral area, and caused strong damage on many buildings in Petrinja, Sisak, and Glina, as well as on solid modern linear infrastructure (roads, bridges, artificial river embankments, pipelines etc.). The seismic hazard is not depending only on the estimated coseismic ground acceleration that should be used for EUROCODE 8 constructional seismic design, but is also strongly dependent on local soil effects and on the secondary effects of a strong earthquake (landslides, liquefaction, suffosion, etc.). Besides, movement of the crustal blocks along the fault lines that cross the solid objects, in case of surface coseismic rupture such was the Petrinja event, should be evaluated. Local site amplification effects are the results of several physical processes (multiple reflections and diffractions, focusing, resonance, wave trapping) in the overlying superifical deposits and soil, resulting in variable damage distribution that were observed in different local geological units affected by an earthquake. Also, the variable surface topography and various mechanical properties of the terrain such as water table, slopes, presence of heterogeneities, structural discontinuities and cavities, certainly can contribute to the observed damage and increase geological hazard in epicentral area. How many unknown active faults we can identified in Croatia? What could be surface manifestation of a strong earthquake that will occure on a shallow thrust (reverse) fault? Is there any major normal active fault that can surprise seismotectonic experts and civil engineers? The authors published first scientific paper after the Zagreb 22 March 2020 event and are currently working on active tectonics in Kvarner region and Hrvatsko Zagorje. Besides, a new Croatian Science Foundation (HRZZ) project has just been started with special attention on soil dynamic properties and its influence on the seismic hazard of the older cultural buildings in Trakošćan, Šibenik and Dubrovnik.","PeriodicalId":142267,"journal":{"name":"1st Croatian Conference on Earthquake Engineering","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122657800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-22DOI: 10.5592/CO/1CROCEE.2021.197
Lukša Lulić, Tvrtko Renić, Michele Škofić, Ivan Hafner, Tomislav Kišiček, M. Stepinac
(1) PhD student, University of Zagreb Faculty of Civil Engineering, e-mail address: luka.lulic@grad.unizg.hr (2) PhD student, University of Zagreb Faculty of Civil Engineering, e-mail address: trenic@grad.unizg.hr (3) PhD student, University of Zagreb Faculty of Civil Engineering, e-mail address: ivan.hafner@grad.unizg.hr (4) Student, University of Zagreb Faculty of Civil Engineering, e-mail address: michele.skofic@grad.unizg.hr (5) Full Professor, University of Zagreb Faculty of Civil Engineering, e-mail address: tomislav.kisicek@grad.unizg.hr (6) Assistant Professor, University of Zagreb Faculty of Civil Engineering, e-mail address: mislav.stepinac@grad.unizg.hr
{"title":"Damage assessment after the Zagreb earthquake – The case study of the educational building","authors":"Lukša Lulić, Tvrtko Renić, Michele Škofić, Ivan Hafner, Tomislav Kišiček, M. Stepinac","doi":"10.5592/CO/1CROCEE.2021.197","DOIUrl":"https://doi.org/10.5592/CO/1CROCEE.2021.197","url":null,"abstract":"(1) PhD student, University of Zagreb Faculty of Civil Engineering, e-mail address: luka.lulic@grad.unizg.hr (2) PhD student, University of Zagreb Faculty of Civil Engineering, e-mail address: trenic@grad.unizg.hr (3) PhD student, University of Zagreb Faculty of Civil Engineering, e-mail address: ivan.hafner@grad.unizg.hr (4) Student, University of Zagreb Faculty of Civil Engineering, e-mail address: michele.skofic@grad.unizg.hr (5) Full Professor, University of Zagreb Faculty of Civil Engineering, e-mail address: tomislav.kisicek@grad.unizg.hr (6) Assistant Professor, University of Zagreb Faculty of Civil Engineering, e-mail address: mislav.stepinac@grad.unizg.hr","PeriodicalId":142267,"journal":{"name":"1st Croatian Conference on Earthquake Engineering","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127001437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-03DOI: 10.5194/EGUSPHERE-EGU21-8781
Helena Latečki, J. Stipčević, I. Molinari
In order to assess the seismic shaking levels, following the strong Zagreb March 22nd 2020 earthquake, we compute broadband seismograms using a hybrid technique. In a hybrid technique, low frequency (LF, f < 1 Hz) and high frequency (HF, f = 1–10 Hz) seismograms are obtained separately and then merged into a single time series. The LF part of seismogram is computed using a deterministic approach while for the HF part, we adopt the semi-stochastic method following the work of Graves and Pitarka (2010). For the purposes of the simulation, we also assemble the 3D velocity and density model of the crust for the city of Zagreb and its surrounding region. The model consists of a detailed description of the main geologic structures that are observed in the upper crust and is embedded within a greater regional EPCrust crustal model (Molinari and Morelli, 2011). To test and evaluate its performance, we apply the hybrid technique to the Zagreb March 22nd 2020 Mw = 5.3 event and four smaller (3.0 < Mw < 5.0) events. We compare the measured seismograms with the synthetic data and validate our results by assessing the goodness of fit for the peak ground velocity values and the shaking duration. Furthermore, since the 1880 Mw = 6.2 historic earthquake significantly contributes to the hazard assessment for the wider Zagreb area, we compute synthetic seismograms for this event at two different hypocenter locations. We calculate broadband waveforms on a dense grid of points and from these we plot the shakemaps to determine if the main expected ground-motion features are well-represented by our approach. Lastly, due to the events that occured in the Petrinja epicentral area at the end of 2020, we decided to extend our 3D model to cover the area of interest. We will present the preliminary results of the simulation for the December 29th 2020 Mw = 6.4 strong earthquake, as well as our plans for further research.
为了评估地震震动水平，在2020年3月22日萨格勒布强烈地震之后，我们使用混合技术计算宽带地震记录。在混合技术中，分别获得低频(LF, f < 1 Hz)和高频(HF, f = 1–10 Hz)地震图，然后合并成单个时间序列。地震记录的低频部分采用确定性方法计算，而高频部分采用半随机方法，这是根据Graves和Pitarka(2010)的工作。为了模拟的目的，我们还为萨格勒布市及其周边地区组装了地壳的三维速度和密度模型。该模型包括对上地壳中观测到的主要地质结构的详细描述，并嵌入到更大的区域EPCrust地壳模型中(Molinari和Morelli, 2011)。为了测试和评估其性能，我们将混合技术应用于萨格勒布2020年3月22日Mw = 5.3事件和四个较小的(3.0 < Mw < 5.0)事件。我们将实测地震图与合成数据进行了比较，并通过评估峰值地面速度值和震动持续时间的拟合度来验证我们的结果。此外，由于1880年Mw = 6.2级历史地震对更广泛的萨格勒布地区的危害评估有重要贡献，我们计算了两个不同震源位置的该事件的合成地震记录。我们在密集的点网格上计算宽带波形，并从中绘制震动图，以确定我们的方法是否能很好地表示预期的主要地面运动特征。最后，由于2020年底在Petrinja震中地区发生的事件，我们决定扩展我们的3D模型以覆盖感兴趣的区域。我们将介绍2020年12月29日发生的Mw = 6.4级强震的初步模拟结果，以及我们进一步研究的计划。
{"title":"Seismic shaking scenarios for city of Zagreb, Croatia","authors":"Helena Latečki, J. Stipčević, I. Molinari","doi":"10.5194/EGUSPHERE-EGU21-8781","DOIUrl":"https://doi.org/10.5194/EGUSPHERE-EGU21-8781","url":null,"abstract":"<p>In order to assess the seismic shaking levels, following the strong Zagreb March 22nd 2020 earthquake, we compute broadband seismograms using a hybrid technique. In a hybrid technique, low frequency (LF, f < 1 Hz) and high frequency (HF, f = 1–10 Hz) seismograms are obtained separately and then merged into a single time series. The LF part of seismogram is computed using a deterministic approach while for the HF part, we adopt the semi-stochastic method following the work of Graves and Pitarka (2010). For the purposes of the simulation, we also assemble the 3D velocity and density model of the crust for the city of Zagreb and its surrounding region. The model consists of a detailed description of the main geologic structures that are observed in the upper crust and is embedded within a greater regional EPCrust crustal model (Molinari and Morelli, 2011). To test and evaluate its performance, we apply the hybrid technique to the Zagreb March 22nd 2020 Mw = 5.3 event and four smaller (3.0 < Mw < 5.0) events. We compare the measured seismograms with the synthetic data and validate our results by assessing the goodness of fit for the peak ground velocity values and the shaking duration. Furthermore, since the 1880 Mw = 6.2 historic earthquake significantly contributes to the hazard assessment for the wider Zagreb area, we compute synthetic seismograms for this event at two different hypocenter locations. We calculate broadband waveforms on a dense grid of points and from these we plot the shakemaps to determine if the main expected ground-motion features are well-represented by our approach. Lastly, due to the events that occured in the Petrinja epicentral area at the end of 2020, we decided to extend our 3D model to cover the area of interest. We will present the preliminary results of the simulation for the December 29th 2020 Mw = 6.4 strong earthquake, as well as our plans for further research.</p>","PeriodicalId":142267,"journal":{"name":"1st Croatian Conference on Earthquake Engineering","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127808416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：