REPORT of the Post-Earthquake Mission on the Earthquake in ALBANIA
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REPORT of the post-earthquake mission on the earthquake in ALBANIA Unofficial English translation of the « RAPPORT de la mission post-sismique sur le séisme d’ALBANIE » dated June 2020 February 2021 Table of content 1 INTRODUCTION 3 1.1 Objectives of the mission 4 1.2 Composition of the mission 4 1.3 Conduct of the mission 5 1.4 Acknowledgements 8 2 SEISMIC EVENT 10 2.1 Earthquake of September 21, 2019 (Mw=5,6 ) 10 2.2 Earthquake of November 26, 2019 (Mw=6,4) 10 3 OVERALL CONTEXT 12 3.1 Tectonics et seismotectonics 13 3.2 Historical Seismicity 16 3.3 Geology and Geotechnics 16 3.4 Urbanisation, land use and habitats 20 3.5 Seismic regulatory environment 30 4 SEISMIC SEQUENCE, SEISMIC GROUND MOTION AND INDUCED EFFECTS 38 4.1 Seismic ground motion and response spectra 38 4.2 Co-seismic displacements 41 4.3 Geological site effects 42 4.4 Macroseismic intensity/Damage distribution 43 4.5 Impact on foundations and soil-structure interaction 46 5 STRUC TURAL BEHAVIOUR AND DAMAGE TO STRUCTURES 48 5.1 Foreword 48 5.2 Types of construction 52 5.3 Analysis of residential buildings 56 5.4 Public facilities 75 5.5 Engineering structures 83 5.6 Industrial facilities 85 5.7 Cultural buildings, historical and religious heritage 85 6 CRISIS MANAGEMENT 90 6.1 Emergency Management 90 6.2 Virtual missions and use of satellite images for damage identification 92 6.3 Post-earthquake building inspection 97 7 RECONSTRUCTION AND RECOMPOSITION OF TERRITORIES 110 7.1 Demolition and temporary situation 110 7.2 Repair work 117 7.3 Property and land issues 119 7.4 Public Attitude and Resilience 120 7.5 Reconstruction cost assessment 124 8 CONCLUSIONS AND INITIAL LESSONS LEARNED 130 9 APPENDIX 132 10 REFERENCES 133 10.1 Books and publications 133 10.2 Other references 135 10.3 Websites 137 2 REPORTFrench ofAssociation the AFPS for post Earthquake-earthquake Engineering mission on the earthquake in ALBANIA 2 / 139 1 Introduction The French Association of Earthquake Engineering (AFPS) regularly organizes multidisciplinary post-seismic missions after major earthquakes or earthquakes whose magnitudes are representative of seismicity in France (metropolitan and overseas). Missions of this type have already been carried out in Indonesia in Lombok (2018), in Mexico City (2017), and in Italy : the Apennines (2016), to mention only the most recent ones. On November 26th, 2019, a major earthquake of magnitude Mw = 6.4 occurred north of the city of Durrës, Albania. The authorities reported 51 dead, nearly 1,000 injured and 17,000 displaced people. On December 1st, AFPS initiated pre-mobilisation, and on December 6th, the AFPS office decided to organize a post-earthquake mission. The particular challenge of the post-earthquake mission in Albania was to gather all the information needed to carry out such a study in a relatively short time period, considering the relative lack of knowledge about this country which has been isolated for a long time and whose borders were only reopened thirty years ago. The AFPS post-earthquake mission to Albania was carried out by a group of 9 people working in design offices, private companies, public institutions with commercial interests, or universities. This mission provided the opportunity to initiate a new international partnership between AFPS and the newly created Albanian Association of Earthquake Engineering. Figure 1-1 Visit of the Port of Durrës REPORT of the AFPS post-earthquake mission on the earthquake in ALBANIA 3 / 139 3 REPORT of the post-earthquake mission on the earthquake in ALBANIA 1.1 Objectives of the mission The objectives of post-earthquake missions are to: collect lessons learned from these events from a technical point of view (application of standards, crisis management, etc...), train young technical specialists working in France in this field (seismologists, structural or geotechnical engineers, architects, crisis managers and natural risk prevention stakeholders, etc.). According to the objectives set for the mission in the Albania earthquake, the report and public presentation cover the aspects below. Seismic and geotechnical setting. This study covers the analysis of the seismotectonic context of the region the mechanisms associated with the event under consideration and presents a synthesis of the measurements (accelerometric networks, GPS, satellite, etc...) and in-situ observations. The possible site effects were also analysed with the information gathered during this mission; Behaviour of structures and equipment. Observations on the behaviour of reinforced concrete structures, masonry, engineered structures and dams were synthesized by identifying pedagogical case studies that could be studied after the mission. The behaviour of networks was also studied; Regulatory context. The analysis of the (local) regulatory context made it possible to measure the effectiveness of the regulation and its degree of application in order to identify regulation provisions that were successful and could be retained, or conversely the weaknesses, which could motivate normative or regulatory changes. These recommendations and their application to the French and European context (Eurocodes) has been provided; Emergency, crisis management and reconstruction/restructuring. Feedback on the emergency diagnosis procedures and tools used in Albania will be provided with the objective to improve the protocols in place in France (work of the AFPS Emergency Unit for Civil Protection). The problems associated with territorial reconstruction/restructuring after an earthquake and the resilience of populations have also been addressed. The mission was carried out in collaboration with the French Embassy in Albania, the Polytechnic University of Tirana and its Civil Engineering and Seismology Departments, the Institute of Geophysics Energy Water and Environment (IGEWE), and the young Albanian Association of Earthquake Engineering (SHOQATA SHQIPTARE E INXHINIERISË SIZMIKE / Albanian Association of Earthquake Engineering). During the mission, exchanges were carried out with organisations such as the Civil Protection of Tirana and the local administration of the municipality of Durrës. 1.2 Composition of the mission The mission team was composed of 9 people from the AFPS who focussed on different themes; who had varying levels of post-earthquake mission experience. After connecting with contacts in the field, the mission was carried out in close collaboration with the young Albanian Earthquake Association (SHOQATA SHQIPTARE E INXHINIERISË SIZMIKE) created in December 2019. 4 REPORTFrench ofAssociation the AFPS for post Earthquake-earthquake Engineering mission on the earthquake in ALBANIA 4 / 139 Name Originating organization Themes Head of Mission, Structures and Crisis Sylvain POLLET APAVE Nord-Ouest Management Pierre Marie ALLIARD Tractebel Engineering Structures Stéphane BRULE Menard Seismology, geotechnics ISTERRE, IRD, Université Cécile CORNOU Seismology, geotechnics Grenoble Alpes Historical heritage, crisis Territoires et Catherine JEAN BAPTISTE management, Développements SARL reconstruction/rebuilding Thomas HEITZ IRSN Structures Léa TRAN ATIXIS Structures Crisis management, Adrien POTHON AXA reconstruction/rebuilding Mikaël GARTNER UNOPS International contacts 1.3 Conduct of the mission The AFPS mission took place in Albania between February 9th and 16th, 2020; mainly in the municipality of Durrës; Mikael GARTNER did not take part in the trip, but supported the contacts, the drafting and proofreading of the report. Figure 1-3 shows the locations visited. Figure 1-2 Albania localisation 5 REPORT of the AFPS post-earthquakeREPORT mission of the post-earthquakeon the earthquake mission in on ALBANIA the earthquake in5 ALBANIA / 139 February 9th 2020 Grouping from Martinique and the regions to Paris, for a flight Paris-Orly/Tirana; grouping to Geneva for people living around Lyon and Grenoble, for a flight Geneva/Tirana Evening gathering at the Hotel Rimini in Tirana February 10th 2020 Interview and contact with Prof. Luan Myrtaj of the Polytechnic University of Tirana, Department of Architecture and Civil Engineering Visit of the premises damaged by the 1985 earthquake with Dr Altin Bidaj: Head of department of Structural Mechanics Interviews at the Geophysical Institute of Tirana with Pr Llambro Duni: IGEWE, and Pr Agim Seranaj: Albania Association of Earthquake Engineering. (IGEWE Institut of Geosciences Energy Water and Environment) Discussions at the French Embassy with Mr Jérôme Spinoza, Cultural Attaché, Mrs Anne Elisabeth Gautier-Budai, Cooperation Attaché, Mr Sébastien Botreau-Bonneterre, Advisor, Technical Expert to the Albanian Government. Interview with Aida Tasellari Structural Engineer at Trema Engineering 2, and Pr Markel Baballëku, Vice-Dean of the Faculty of Civil Engineering, Lecturer in Structural Dynamics and Earthquake Engineering February 11th 2020 Interview with Mr Florian Tahiri, Vice-Mayor of the Municipality of Durrës, Prof. Alma Golgota of the Polytechnic University of Durrës, and Prof. Altin Seranaj of the Polytechnic University of Tirana, Department of Architecture and Civil Engineering Visits to damaged buildings in the town of Durrës, accompanied by Prof. Alma Golgota and Prof. Altin Seranaj. February 12th 2020 H/V measures on 3 axes in Durrës (team 1), with the assistance of Pr Agim Seranaj, for access to the building. Visits to Durrës of the heavily damaged areas (team 2), accompanied by Pr Altin Seranaj Interview with Raphaelo Rexho, Technical Director of the Port and his team, and visit