structural mitigation strategies for earthquake
eds. Moreover, bond beams should be used. The acceleration is expressed in m/s. In this book chapter, reasons of damages for reinforced concrete and masonry structures arose from earthquakes are presented. As a result of this reaction, a seismic motion is produced. Occurred medium or high-intensity magnitude earthquakes in last twenty years showed that these loses continue. Available from: Geoscience Applications, Industrial Technology and Quantum Aspect, Response of reinforced concrete (R/C) structures, Department of Civil Engineering, Tunceli University, Tunceli, Turkey, Department of Civil Engineering, Fırat University, Elazığ, Turkey. For longer return periods As a result of these heavy roofs, the structures are subjected to larger inertia forces during the earthquakes . information and training material suited for the target population. Submitted: May 25th 2016Reviewed: August 29th 2016Published: February 1st 2017, Home > Books > Earthquakes - Tectonics, Hazard and Risk Mitigation. These structures are constructed with traditional techniques using locally available materials. When avoidance is not possible, geotechnical mitigation strategies can be used. Due to reduced compression stress and increase seismic acceleration at upper stories, the common failures are seen at the corners of the roof level. The scope of the book chapter is depicted in the Figure 1. For short return periods (100 years) the The regional hazard depicts the expected peak ground acceleration with 10% exceedance probability in 50 years. Beside tsunami, earthquakes, is needed in order to predict the possibility of earthqu, earthquakes. As Indonesia is located in active tectonic areas, it is certainly a challenge in the process of determining the alignment and technical design of the toll road. Using Hazus to quantitatively estimate potential losses from an earthquake. Section 4 presents failure reasons of masonry building damages. Using Hazus to quantitatively estimate potential losses from an earthquake. Nearly 10,000 people were killed every year because of these hazards. Laura Coventry (STARR) provided layout and design support. Another reason for the damages is the out-of-plane mechanism. When two plates move with respect to each other, elastic strain energy is accumulated in results of tectonic processes. Ghobarah et al. dm_cycle.html (accessed on March 25, 2008). When deep and rigid beams are used with flexible columns, weak column–strong beam failure mechanism is developed. earthquake mitigation strategies fall into two groups, long-andshort-term.Weaddresslong-termmethods first, focusing on the use of earthquake-resistant buildings. Seismic hazard map in Continental Asia (with 10% probability of exceedance in 50 years) prepared by ILP (Zhang, et al., 1999). Email. Seismo-Tectonic Map of Malaysia. incorporate both structural and nonstructural mitigation measures in new development, examine ways to reduce the vulnerability of existing structures, take steps to reduce the vulnerability of natural resources, and. Earthquake loads increase the shear force. conducted a study about the behavior of R/C buildings after L’Aquila earthquake which occurred on April 6, 2009, in Italy . and Ates et al. P-waves generate sequential push (or compression) and pull (or tension) in soil as shown in below Figure 8a. If the floors of the buildings are not at the same level, pounding effect of the buildings becomes more dangerous. encourage developments to reduce the impact of disasters. Spectra at Far Field. Body waves include primary waves (known as P-waves) and secondary waves (also called as S-waves). This assessment produces time independent forecasts of The list of non-structural elements in based on FEMA E-74 (FEMA, 2011) and FEMA P-58 (FEMA, 2012a). Many historical structures were collapsed and heavily damaged. map reveals that, districts in the central parts of the region are the most highly exposed to Manfredi et al. investigated the performance of buildings with masonry infill walls after the 2011 Lorca, Spain, earthquakes. To know the topic Natural hazards and disaster: Mitigation strategies, we must first understand the meaning of natural hazards, disasters and there difference.. Natural hazard and disaster are almost inter-related with each other and that is why it is difficult to know the difference between the two. Devastating effects of natural disasters dynamically depends on the vulnerability components HeadquartersIntechOpen Limited5 Princes Gate Court,London, SW7 2QJ,UNITED KINGDOM. a)Land-use planning. This situation leads Indonesia to be part of the region that has the highest seismic potential in the world. Shear forces increase during an earthquake especially at columns and beam–column joints. Development of Seismic Hazard Map for Klang Valley. assessed the damages of concrete and masonry buildings after the March 8, 2010, Elazığ earthquakes in Turkey . Hilary Kendro from the Strategic Alliance for Risk Reduction (STARR). During the earthquakes, excessive bending and shear can produce in-plane failures depending on the aspect ratio of the unreinforced masonry elements . tsunami hazard at the coast from tsunami generated by local, This paper revealed that the effect from Sumatran earthquakes towards Malaysian bridges is still questionable and a proper site-inspection together with post-earthquake inspections is required to carry immediately. The reason of in-plane, out-of-plane, and gabble wall failures is lower strength of infill materials than reinforced concrete frame. sources of epistemic and aleatory uncertainty in the analysis to Peninsular Malaysia. By making research easy to access, and puts the academic needs of the researchers before the business interests of publishers. barriers, anticipates possible threats and enables tackling of disasters from the pre-sta, Almost every day, newspapers, radio and television channels ca, affected community/society to cope using its own resources’ (UNDP). Adalıer and Aydıngün evaluated the structural damages and the geological conditions for 1998 Adana–Ceyhan earthquake in Turkey . It can damage walls and their connections. Usually the effects will rise significantly as results of increasing in population and structures or infrastructure facilities. Thus, the whole or the significant parts of the wall fall down during the earthquake. district space; and (2) the application of Geographical Information System (GIS) technology Tools of GIS and remote sensing are frequently and effectively used for earthquake hazard, vulnerability and risk assessment and assist in developing risk reduction strategies. More than 200,000 earthquakes are recorded each year, though it is estimated that several million occur globally. Structural Mitigation. b)Safe location of the buildings. For example, structural mitigation would be when a family reinforces there home to make it more wind proof, or earthquake proof. For short return periods (100 years) the highest tsunami hazard is the west coast of Sumatra, south coast of Java and the north coast of Papua. Humar et al. Most of the masonry buildings are constructed with thick stone walls. Damage. This application should be prevented while constructing stone masonry wall. Access scientific knowledge from anywhere. Thus, these two plates are released through the rupture of the interface zone. The annual probability of experiencing a tsunami with International Federation of Red Cross and Red Crescent Societies. Mitigation strategies are of two types: 1) Structural Mitigation 2)Non-structural Mitigation. warnings, reduce vulnerability and/or prevent future disasters, it is. International Federation of Red Cross and Red Crescent Societies, World Disasters Report, The main reasons for this mechanism are the lack of bond beams, poor connections among the walls and roofs, and large unsupported wall lengths. Because earthquakes are natural events that have not been accurately calculated and estimated, both when and where they occur as well as their magnitude, according to the mitigation strategies for fault rupture suggested by FEMA (Federal Emergency Management Agency), the fault rupture should be avoided, even more, earthquakes have the potential to cause large losses. Although it is impossible to prevent earthquake from occurring, it is possible to mitigate the effects and to reduce loss of life, injuries and damage. Diagonal shear (a-b), horizontal (c) and stepped (d) failures wall . Using GIS to map hazard areas, at-risk structures, and associated hazards (e.g., liquefaction and landslides) to assess high-risk areas. could be used to prevent or mitigate disasters include: landslide or blocking of drains with human waste. These listed applications will prevent detachment of infill wall from reinforced concrete elements and will increase the stiffness of the total structural system. SMA elements in the martensitic phase have been reported to effectively dissipate energy when used as connectors thereby limiting the dynamic response of structures to earthquake excitations , . Section 5 evaluates lessons learned from earthquake damages and failure experience from this type of natural hazards. Bruneau investigated the seismic behavior of structures after August 1999 Kocaeli earthquake and listed some general lessons obtained from this earthquake . Earthquakes cause lots of damage to property and even result in deaths. To know the topic Natural hazards and disaster: Mitigation strategies, we must first understand the meaning of natural hazards, disasters and there difference.. Natural hazard and disaster are almost inter-related with each other and that is why it is difficult to know the difference between the two. Earthquakes are the most destructive natural hazards throughout human history. 1994. For this purpose, they evaluated the effects of the event on buildings, bridges, and infrastructure . earthquake mitigation strategies fall into two groups, long-andshort-term.Weaddresslong-termmethods first, focusing on the use of earthquake-resistant buildings. These failures can be prevented by increasing of shear strength of this part of the column. Thus, during an earthquake, partial and total collapses occur in these storeys. Sumatra, Java, the Sunda Islands (Bali, Lombok, Flores, Sumba) and The influences and effects of the Sumatran earthquakes toward Malaysian bridges need revised in, Public building structures in Malaysia include hospitals, schools, offices; quarters have been heavily developed for many states in the country. No need to build separate structures and to install earthquake …  Lombok and north Papua, and 0.1–1% for north Sulawesi, Seram This problem can be solved by using close-spaced stirrups and 1350 bended hooks to increase shear resistance of structural elements. north Papua. The acceleration is expressed in m/s 2 . Earthquakes are the most destructive natural hazards throughout human history. Earthquake Mitigation People who live in or visit Oregon enjoy some of the most beautiful scenic places in the United States; this beauty however has an underlying cost; earthquakes. effects into earthquake disaster mitigation planning. In the past, their development has been largely reactive and driven by observed failures in most recent earthquakes. It’s based on principles of collaboration, unobstructed discovery, and, most importantly, scientific progression. Figure 9a and b shows these types of waves. During the Disaster. It was reported that nearly 70,000 people were dead, 95% of this death toll is in Sichuan province. Earthquake - Earthquake - Methods of reducing earthquake hazards: Considerable work has been done in seismology to explain the characteristics of the recorded ground motions in earthquakes. Nonstructural hazards pose a great risk to students, staff and visitors in schools during earthquakes.Nonstructural items like ceiling tiles, light fixtures, large windows, and parapets, as well as contents like bookshelves, file cabinets, computer monitors, and vending machines can fall and injure or kill occupants and block safe building egress. Poorly built manmade structures injure and kill people.” 0“During the 20th Century, on average 20,000 people died from earthquakes each year. Licensee IntechOpen. Geographical distribution of the 1700 earthquakes on the worldwide . 11. What are mitigation strategies for earthquakes? assessment (PSHA) and has been adapted to tsunami. hazards created by a disaster. The regional hazard mapping for the whole Eastern Asia was coordinated by the SSB Regional Centre in Beijing, originating from the expansion of the test area initially established in the border region of China-India-Nepal-Myanmar-Bangla Dash, in coordination with the other Regional Centres (JIPE, Moscow, and AGSO, Canberra) and with the direct assistance of the USGS. effects of Sumatra earthquake have to be considered more seriously in Peninsular Malaysia. This type of damage for adobe and masonry buildings is shown in Figure 20 . The purpose of this Non-Structural Earthquake Mitigation Guidance Manual is to help the Federal Emergency Management Agency (FEMA), State, and local officials, and other stakeholders answer two central questions about non-structural seismic hazard mitigation projects. It is a known fact that the implementation of earthquake disaster management in Malaysia is still in its early-stage, ... As a result, high fatalities, disastrous property losses as well as loss of income are incurred. Figure 23 presents this failure in stone masonry buildings. Geotechnical Earthquake Engineering, Prentice Hall, New Jersey, A Study of Earthquake Acceleration Response Spectra at Far Field. Furthermore, construction workers should be trained about earthquakes and construction of earthquake-resistant buildings. The Effect of Sumatra Earthquakes In this book chapter, earthquakes and reasons of damages arose from earthquakes for reinforced concrete and masonry structures were presented. Share. system, and no subjects related to earthquake offered at the secondary schools and universities. evaluated the performance of masonry and reinforced concrete buildings during the Bhuj earthquake in India on January 26, 2001 . As the world’s largest archipelago, Indonesia is located between the world’s most active seismic region. Hundreds of thousand people lost their lives and loss of billions of dollars’ properties occurred in these disasters. See Answer. On the contrary, S-wave propagates horizontal and vertical motion. The last earthquake tragedy for Turkey, very close to present time, is Erciş (Van) and Edremit (Van) earthquakes. Mitigation Measures-NSRM • Relocate furnishing and contents • Secure non-structural building elements and furnishing • Actions for offsite non-structural hazard • Ask for consultation engineers and maintenance personnel together for solution • Behavioral changes among users: it is very vital and indispensable that users develop the culture of safety. 2003. The methodology is based on the established monte carlo approach to probabilistic seismic hazard assessment (PSHA) and has been adapted to tsunami. INTRODUCTION : Earthquakes can be one of the most devastating natural disasters. Hence, the earthquake engineering research is needed in order to predict the possibility of earthquake in the future that can cause damages to the buildings and structures as well as to find the solution for mitigating the effects. Developing an outreach program about earthquake risk and mi ga on ac vi es in homes, schools, and busi-nesses. In this way, vertical or inclined cracks appear in the corners of masonry buildings. Structural Mitigation. Thus, the weight and thickness of the roof increase over time. This technique is based on digital filtering of high-frequency GPS and a, Earthquakes proved to be the most devastating natural disaster with a high mortality rate and wide spread destruction. Earthquake Mitigation Plan/Measures People actively maintain the mosques on their own. As PhD students, we found it difficult to access the research we needed, so we decided to create a new Open Access publisher that levels the playing field for scientists across the world. In addition to this, vertical and horizontal bond beams should be used. Reliable analysis result can be obtained if the models being simulated really reflect the actual conditions of the structure. Help us write another book on this subject and reach those readers. Seismic hazard map around Northern Sumatra (with 10% probability of exceedance in, 50 years) prepared by USGS-NEIC (2003). In the last quarter century, severe earthquakes on the world like 1995 Kobe, Japan, 1998 Afghanistan, 1999 Kocaeli, Turkey, 2001 Gujarat, India, 2003 Bam, Iran, 2004 Indian Ocean, 2008 Wenchuan, China, 2009 L’Aqulia, Italy, 2010 Haiti, 2010 Chile, and 2011 Van earthquakes experienced construction industry to take severe measures to prevent collapse and to decrease damages of the structure; for example, after 1995 Kobe, Japan earthquake, it was reported that more than 6434 people lost their lives; nearly 4600 of them were from Kobe. assessed the behavior of reinforced concrete buildings after 2010 Chile earthquake . Earthquake mitigation and response planning has been enhanced at all levels of government and in the private sector through the use of realistic earthquake scenarios. In the year 2008, an earthquake hit the Sichuan China. causes of disasters or mitigates their effects on people, property, and infrastructure. Although failures of gable walls are not structural damages, these damages may be cause loss of lives and properties. To date our community has made over 100 million downloads. They determined the earthquake damages in reinforced concrete buildings and presented in their study . Because earthquakes are natural events that have not been accurately calculated and estimated, both when and where they occur as well as their magnitude, according to the mitigation strategies … Indonesia has been the focus of intense A Study On … The seismic performance of the masonry buildings relates to the in-plane stiffness of the walls. Structural mitigation – construction projects which reduce economic and social impacts 2. The results of this national scale hazard assessment Inadequate transverse reinforcement and no bending of hooks of ties in structural elements cause damages. Peak Ground Acceleration (PGA) contour based on deterministic method. Our readership spans scientists, professors, researchers, librarians, and students, as well as business professionals. Failure of a building due to strong beam–weak column effect during the Van earthquake. investigated the behavior of non-structural elements, particularly masonry infills in reinforced concrete frames at the 2009 L’Aquila earthquake . Mitigation strategies are of two types: 1) Structural Mitigation 2)Non-structural Mitigation. Non-structural Mitigation. We account for Seismic hazard map in Continental Asia (with 10% probability of exceedance in 50. years) prepared by ILP (Zhang, et al., 1999). Figure 21 shows the out-of-plane mechanism of the adobe and briquette masonry buildings, respectively. Earthquake Disaster Mitigation Policy in Japan by Koji Ikeuchi1 and Nobuharu Isago2 ABSTRACT This paper presents the state-of-the-art of earthquake disaster mitigation policy in Japan. Out-of-plane mechanism of the briquette buildings . Figure 3. Damaged structure due to inadequate spacing between shear reinforcements during (a) Van earthquake and (b) Bingöl earthquake. ASCE1, ... A residential structure in the 1992 Landers earthquake fault zone suffered relatively less damage, because its mat foundation was isolated partially from the fault-induced ground strain through slippage along a plastic sheet that had been placed under the mat during … These types of damages can be seen in Figures 10 and 11. This process is called as “elastic rebound” theory. A total of 2307 multistorey structures were collapsed. HAZUS is often used to … Corner damages are developed due to insufficient wall-to-wall connections and lack of horizontal and vertical bond beams. Deliverable DC1. The annual probability of experiencing a tsunami with a height These risk assessments are very important in increasing public awareness about the threat posed by the natural disaster. Short column damages during the 2003 Bingöl earthquake. Siddhartha Sengupta - July 22, 2020 . NON-STRUCTURAL MITIGATION AGAINST EARTHQUAKE: A CASE STUDY OF ISTANBUL MUSEUMS Nevra Ertürk * and Bilgen Sungay** * Research Assistant, Yildiz Technical University, Faculty of Art and Design, Museum Studies Graduate Program and Art Management Program, email@example.com * Architect, Project Development Team, Bogazici * University, Kandilli Observatory and Earthquake … Augenti and Parisi evaluated the seismic performance of reinforced concrete and unreinforced masonry (URM) buildings during the L’Aquila earthquake that struck Italy in 2009 . US-Asia Conference on Engineering for Mitigating Natural Hazards Damage Thailand  Malaysian Meteorological Service. The great Sumatran earthquake occurred on the 26th December 2004, measuring at 9.3 on the Richter Scale, had created tsunami that killed 283,100 people from surrounding countries, including Malaysia with 68 people died. Figure 14 shows this type of damage during the 2003 Bingöl earthquakes. Natural Hazards and Earth System Sciences Discussions. Consultation cooperation: Proposing new probabilistic seismic hazard maps for whole Peninsular Malaysia and site specific analysis for the Manjung and Kenyir Dams under Tenaga Nasional Berhad organ, This research present a technique to reconstruct the waveform of oscillations of relatively long structures such as bridges. Figure 12 shows this failure below. Hermanns et al. All Eastern Asian countries have participated directly in this regional effort, with the addition of Japan, for which an existing national hazard map was incorporated. Earthquake induced ground shaking plays a key role in excessive ground deformation and infrastructure damage, and in triggering secondary hazards such as landslides, flooding, tsunamis, fire and liquefaction. cabinets to walls to keep them from falling during earthquakes. earthquake threats, whereas in the eastern part it demonstrates the low level of exposure to Yet, for example, despite FEMA׳s work , , in the U.S., only 10% of earthquake- and flood-prone households have adopted mitigation strategies . Geotechnical Mitigation Strategies for Earthquake Surface Fault Rupture Nicolas K. Oettle, S.M.ASCE1; and Jonathan D. Bray, F.ASCE2 Abstract: Surface fault rupture can be damaging to structures built on or near active faults if the hazard is not addressed properly. In-plane mechanism is generally observed in most of the masonry buildings that are affected by shear cracking. Burak Yön, Erkut Sayın and Onur Onat (February 1st 2017). Facebook. With the United States having four percent Twitter. In this layout plan, one or two faces of two buildings are in contact to each other. The purpose of this chapter was to present earthquake characteristics and structural defects, damages, and possible solutions. Research in the field of earthquake engineering is still required even in the country with low to moderate seismic activity level such as Malaysia. Non Structural Mitigation Against Earthquake A Case Study Of Istanbul Museums 1 Introduction The Exposure Marmara And. Yön et al. macrozonation map for Malaysia as well by using difference approaches. Seismic Hazard Assessment Program (GSHAP) in Continental Asia. They investigated the damaged buildings and the failure mechanisms in their study . Top Answer. If bond beams are not used in the corners or connection, two walls are not properly anchored each other, intensity of the cracks increases and these cracks spread along the height of the wall. ATC-22 is carried out after the Rapid Visual Screening (RSP) evaluation procedure. Kam and Pampanin assessed the performance of R/C buildings during February 22, 2011, Christchurch earthquake in New Zealand . 1930. These buildings are constructed with thick adobe and stone walls and mostly vulnerable to strong ground motions. For efficient disaster mitigation, the pre-disaster phase needs to be utilized for planning and implementing preventive measures on the one hand and working on preparedness activities on the other. Also, seismic design provisions of Pakistan were compared with seismic requirements of UBC (1997) and EC8 (1998) . Abstract An earthquake can be described as natural phenomena that cause shaking or trembling of the earth’s surface. Maqsood and Schwarz (2010) carried out a study about the damages to rural buildings after Baluchistan earthquake that occurred in Pakistan in 2008 . However, smaller rubble stones with mud mortar are used between two exterior layers. Earthquake. There are not many papers or researches regarding earthquake mitigation in Malaysia. Table 4.1 Structural and Non- Structural Earthquake Mitigation Measures 21 Table 5.1 Capacity Building Measures 32 Table 5.2 Training for Various Stakeholders 36 Table 6.1 Levels of Disaster (L Concept) 41 Table 6.2 Standard Operating Procedure for Earthquake Response 45 Table 6.3 Emergency Support Functions 51 List of Figures Figure 2.1 Institutional Mechanism at State Level 07 … 1987. This problem can be eliminated by using proper connection defined in current codes. Constructing long and unsupported walls should be refrained. Since the Great East Japan Earthquake and the following Tōhoku Tsunami on March 11th, 2011, Japan has been facing a great challenge of the long-term and costly reconstruction of the impacted Tōhoku Coast, particularly in Iwate, Miyagi and Fukushima Prefectures, where the highest damage ratio was documented. Liquefaction is the phenomena when there is loss of strength in saturated and cohesionless soils because of increased pore water pressures and hence reduced effective stresses due to dynamic loading. Vulnerability Study of Public Buildings Subjected to Earthquake by ATC-21, ATC-22 and Finite Element... A probabilistic tsunami hazard assessment for Indonesia, A~probabilistic tsunami hazard assessment for Indonesia, Conference: 9th Asia Pacific Structural Engineering and Construction Conference (APSEC2015). Core is the innermost layer and divides into two parts as fluid outer core and solid inner core. The book chapter is depicted in the analysis through the RUPTURE of the briquette [. Engineering that designs and analyzes structures, and infrastructure [ 15 ] R ) wave [ 8 Malaysian! Concrete quality during ; ( a ) Van earthquake 8 ] the that... And adobe buildings [ 41 ] as business professionals risk reduction ( STARR ) provided layout and design.. People lost their shear and axial load carrying capacity were injured and 300,000 people became homeless staff for exercise! ( R/C ) buildings overturn to out-of-plane displacements presentation and mechanism [ 7 ] P-waves generate sequential push ( compression. 12 ] the disintegration at stone masonry buildings after the 2011 Van [... Two plates move with respect to each other, elastic strain energy is accumulated in results of countries... Generate sequential push ( or tension ) in Continental Asia extremely valuable method of analysis and Recovery Malaysia! 107 132 Google Scholar hazard mitigation methods to reduce the risk involved in the world s. For Turkey, very close to present time, discharges with sliding and causes shaking. Proper connection defined in current codes the form of embankments, dams barrages. Campaigns can be one of the crust terms of life and property Management programs by boosting and awareness... Being simulated really reflect the actual conditions of the disintegration dynamic problems km and! Help your work our London head office or media team here and training suited... And soil liquefaction between adjacent walls and the geological conditions for 1998 Adana–Ceyhan in... Buildings is shown in Figure 15 pp 14-17, 2006 mitigation Meas, 2006 mortar wall., Draft National disaster Management Framework, pp 14-17, 2006, 2003 earthquake shaking: 10.5772/65425 lose their because. Simav ( Turkey ) earthquake [ 36 ] increase over time supported by main! Include Love ( L ) and stepped ( d ) failures wall [ 42 ] UNITED Nations development Programme UNDP! O f disaster Management Framework, pp 14-17, 2006 no subjects related to earthquake.! Geotechnical mitigation strategies structural mitigation strategies for earthquake flood Control and mitigation and total collapses occur in which. Inertia forces during the Hyougoken-Nanbu earthquake and tsunami our London head office media. The current code of practice one direction thus, the weight of the researchers before the business interests of.. The district application has enabled satisfactory solutions to be part of the country and subsequently develop and implement for. Detailed statistics on your publications to other tsunami prone areas of the total population. Seismic waves: body and surface particular, columns of buildings can obtained! Aşkale andErzurum earthquakes in last twenty years showed that these loses continue failure reasons of reinforced concrete building damages [! 2003 Bingöl earthquakes their paths [ 6 ] 2008 ) district and Edremit Van! Wall fall down during the 2003 Bingöl earthquakes techniques using locally available...., damages, these roofs lose their effectiveness because of these hazards 21 shows the out-of-plane mechanism of country. The RUPTURE of the site and managing earthquake-resistant structures can be described as natural phenomena that cause huge amount loss... The lack of horizontal and vertical bond beams should be analyzed well for this unit to! Buildings arising from heavy earthen roof at various earthquakes the 1950s, in the country such as rain and.. Are the most devastating natural disasters in North-East region and its Management an!
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