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Abstract Housing as a major structural part of the settlement, having major role in the formation of spatial structure and identity of rural architecture, and The most important measure of housing satisfaction can be summed up in its strength. With respect to the unstable in geographical conditions in relation to earthquake as a natural disaster in Iran, and thanks to it`s non-compliance with technical standards in the construction, the use of traditional and non-resistant building materials and housing was worn, leading to greater vulnerability of rural settlements to earthquake disaster. The aim of this study was to investigate the situation and determine the vulnerability of rural housing in Sjasroud County in Zanjan Province. Data were collected using questionnaires and interviews and analyzed through SPSS statistical tests. The results of data analysis shows low local capacity to deal with housing in earthquake vulnerability among families, and of inadequate local capacity allocated to physical capacity of housing. In addition, regression analysis showed that the local capacity for economic and physical factors, respectively, with 0.491 and 0.298 the highest level of institutional and social factors, with 0.126 and 0.160 having the lowest impact on the vulnerability of housing in study area.

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Earthquake is known as one of the most destructive natural phenomena that causes a wide range of disasters: irrespective of the economic losses that are inflicted on the city, and in a smaller scale on the citizens, the human losses, and also the psychological problems caused by the death of the relatives, homelessness and insecurity are all known as a crisis caused by earthquake. Since it is impossible to prevent earthquake, we should look for proper approaches to confront this phenomenon. More importantly, surveying the features and the characteristics of the cities should be carried out as the basis of preventive actions towards earthquake because if we suppose the seismic intensity to be equal, it’s the urban features and structures that can change a natural phenomenon to a human catastrophe. The present article aims to survey the most significant global and national experiences related to decreasing the vulnerabilities to earthquakes, and also re-defining the set of urban-designing approaches in order to reduce damages of earthquakes. Based on the given data, the research method is qualitative and attributive. The results show that the global experiences put emphasis on city texture, including open spaces, the connection network, and physical structures, while in Iran, irrespective of the studies by the JICA group, most of the assaying and damage-decreasing modeling cases have been performed in terms of single-structures and the social features have been ignored. Finally, we should say that, just in the circumstances that we set the plans of “urban-safety against earthquake” as a goal in all the stages of planning, especially the urban planning programs, we would be able to reduce the vulnerability of the cities toward seismic problems.

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The study of seismology in different geomorphologic zones to detect particular behavioral patterns in the region is the main goal of this research. So, geomorphic zones were separated and 30 years of data depth, magnitude and frequency of earthquakes were attributed in GIS for each geomorphic zone. Then the data were saved for each zone separately extensively and analyzed in SPSS and Minitab software and then compared. The results showed that among 9 morphologic zones, Zagros and the Caspian zones are the most irregular situation. The relative density of earthquakes is high in the Zagros, but the occurrence of earthquakes is less in this area than other zones. The biggest b values assigned to this area, but there was not a completely regular increasing trend towards the depths. Relative density of earthquakes in the Caspian is not high, but big earthquakes are more. A
  minimum value of b belonged to this zone and finally, b changes to the depth were chaotic. Other zones had some characteristics some of which can be placed into one of the two Zagros or Caspian zones, however they have a regular pattern in their b changes toward depths. Therefore the east, northeast and north zones are about similar to Caspian zone and south plain and northwest zones are similar to Zagros zone. Central of Iran and Makran zones show intermediate characteristics.

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For vulnerability reduction of cities to earthquake hazard, such as Tehran city, it is necessary to adopt policies based on the accurate recognition of the nature and causes of vulnerability. The excessiveness of non resistant buildings in developing countries and cities such as Tehran, vaises the question that: Why the degree of seismic vulnerability of buildings, especially residential buildings, is different and high. to answer this question, the review of theories of vulnerability and disaster management showed that retrofitting and vulnerability have deep social dimensions. thus, based on the theories of social structure of vulnerability, the purpose of this research is analyzing the effects of  socio-economic factors on residential vulnerability of houses of Tehran city. The research method is descriptive- analytical. Sample volume of households calculated by Cochran's method (325), and sampling was done by cluster method. Needed data gathered by household and expert questionnaires, and analyzed by correlation and linear regression methods. The findings showed that there are reverse relation between degree of residential vulnerability of houses and income -0.575, literacy -0.692, employment -0.825, socio-economic status -0.665, risk perception -0.326. According to the result of linear regression analysis, 83 percent of changes of seismic vulnerability explained. The Conclusion is that, residential vulnerability and retrofitting have deep socio- economic dimensions. So, for buildings retrofitting, in addition to technical and engineering factors, socio-economic factors such as poverty reduction and socio-economic empowerment of households and individuals must take in attention seriously.

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In this research has been tried to do a statistically study in Iran and geomorphic zones to open a statistically discussion about time of earthquakes and their probably correlation to amount of rainfalls at some days before earthquakes.Earthquakes including 4 Richter and above records was obtained from site of IIEES (International Institute of Earthquake Engineering and seismology ) and the rainfall records occurring 10, 15, 20, 30 and 40 days before the earthquakes occurrence (DFEO). All of data and then data relation to each geomorphic states sort on excel spreadsheet and analyzed at 19 version of SPSS software using to different tests. X2 test and phi test show that there isn't any significant difference between occurrence of earthquakes frequency at day times and nights during 30 years. Spearman correlation coefficient didn’t show a significant relationship between amount of rainfalls during 4 periods (10, 15, 20, 30, and 40 DFEO) and earthquakes. X2 test and Cramer's V test also showed a poor association between rainfalls and earthquakes numbers. However, more study on data elucidate that it can find a significant correlation at some years. Results showed there is a relation between frequencies of occurrence rainfalls for 10 DFEO and frequencies of earthquakes at the Zagros state. Nonetheless, it wasn't observed any relation when the rainfalls under 10 mm unaccounted in analysis. So, this clears that more earthquakes at the Zagros state occurred at lack or less rainfall situation. But, a more study on data during the time periods showed a significant relation for 10 and 15 DFEO in 1996 on which occurrence of earthquakes has increased along with increasing of precipitation to 38 mm limit namely, among of 52 earthquakes, 14 cases of earthquakes have included more than 10 mm and less than 38 mm rainfall, whiles, it has occurred 28 cases of earthquake when rainfalls have passed from 38 mm limit.

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Iran is located in one of active regions of the world regarding the occurrence of earthquakes. They cause lots of financial and bodily damages. One of the most important programs to be administered by our government is to reduce vulnerability against earthquakes, studies within the administration of strengthening important governmental buildings, and infrastructures in the country. Buildings in schools have a high priority regarding the program mentioned above. The present research has been carried out in schools in Eastern Azerbaijan province especially schools in Tabriz since they are located in an area with a high probability of earthquake occurrences due to the importance of strengthening discussions and the new approach chosen by the schools' renewal organization in improvements regarding the earthquakes and crisis management in the areas mentioned. This research has used a descriptive-measurement method to gather data in the forms of library studies and field studies and has used interview and questionnaire tools in closed formats. Also we have tried to assess critical success factors of projects regarding the viewpoints of scholars in the field within the time period between 2006 and 2014. Results showed that the most important critical success factors were as follows: necessity and emergence of administering strengthening projects, proper administration of administrative details based on technical features, the presence of qualified consultants in the related fields with high administrative capabilities, documentation and creation of the terminal to archive study and administrative experiences. Finally, the proposed guidelines for effective project beneficiaries were presented to direct the set of efforts carried out in the project towards the utilization or halting these factors and to get a better result.

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Earthquakes can cause significant disruption and devastation in communities. Especially, Iran is one of the countries with the most natural hazards, while earthquake causes most of casualties in this country for several reasons including the inappropriate construction methods, the improper physical growth and the lack of minimum necessary requirement. Mashhad is a city located in the northeast of Iran, the center and capital of Razavi Khorasan Province and the second largest populated city after Tehran. This city because of the high-density housing and the absence of urban development plans in worn-out context is facing a more serious risk. In this study a new hybrid method has been proposed for emergency location problem. First, a system dynamics model for the urban has been used to estimate the number of damaged buildings by focusing on construction and population subsystems. Second, the number of earthquake casualty has been estimated by the casualty estimation model of Coburn and Spence, while the output of system dynamics model is the most important inputs of this model. This method is implemented for different possible earthquake scenarios in Mashhad. Each scenario has been defined based on the length of active fault, the acceleration of activity and the greatness of the quake. Third, the Geographical Information System (GIS) has been used to specify the potential emergency location centers to cover the population. Finally, the location allocation model has been presented to locate the emergency location centers cover the survivors. The results of this hybrid model showed that we need at most 231 emergengency locations in the worst case and the minimum needed locations is 93. 
 

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In the midst of environmental hazards, earthquakes destroying buildings and urban infrastructure, it causes a great deal of damage to property and property in and around urban areas. Facing this situation, developing resilient communities is the most appropriate strategy to deal with the earthquake crisis. The first step in a principled and conscious planning of creating resilient communities, measuring the resilience of urban structures against possible earthquakes. Therefore, the present study aimed to evaluate the physical resilience of district 6 of Tehran against various earthquake scenarios. Ten effective criteria were used to measure 46 sub-criteria that were effective in physical resilience of the area. The research method is descriptive-analytical with practical purpose. To Analyze the Relative Weight of Criteria and Sub-Criteria of Network Analysis (ANP) and for designing earthquake scenarios at different intensities Fuzzy method and Dµ model in GIS environment were used. The results of the study showed that In earthquake of six magnitude 12.36% of total structures in the region Most located in one district municipality (Iranshahr neighborhood) and 2 district municipality (Nosrat neighborhood), They have little resilience to earthquakes. In Richter earthquake of seven, 55.24% of structures in the region have low resilience and 17.69% of structures have very little resilience to earthquakes. In the Eight earthquake of eight, with increasing earthquake intensity, 23.06% of structures in the region have low resilience and 53.31% of structures have low resilience. Most of these structures are located in district 6 of Tehran city in district 1 (Iranshahr and Valiasr neighborhood), 2 (Nosrat neighborhood), 3 (Behjat Abad and Ghaem neighborhoods), 4 (Fatemi neighborhood) and 5 (Argentina neighborhood).

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 The location of the country on the earthquake belt and the issue of earthquake crisis control, by looking at the statistics and recorded records of past and contemporary environmental threats, the fact is revealed that the current crisis management cannot alone be able to deal with the destructive effects of disasters in order to prevent the effects are destructive to vital and sensitive centers and human resources, therefore, it is necessary to apply the principles and criteria of passive defense, which can help to complete the defense chain effectively and significantly. Earthquake is a natural and often destructive phenomenon and event which has received little attention in the urban planning of the country. Most existing studies on reducing damages caused by earthquakes have been around building construction methods to increase the building's resistance against earthquakes. The main focus of the present study is investigating passive earthquake defense in Kermanshah city. According to the goal and in order to identify vulnerable areas against earthquakes, 45 components were identified in the form of 4 natural, physical, social and economic indicators and were investigated with the Aras model. During this research, in parallel with the basic investigations and presentation of theoretical foundations related to the research topic, a panel of experts was formed, and their opinions were collected in the form of a database in Arc GIS software. In addition to earthquake risk zoning, vulnerable spatial and physical development periods were presented based on specific passive defense principles and appropriate solutions to improve the current situation. The research results showed that Regions 8, 4, 1, and 6 have the least vulnerability and Regions 7 and 5. Moreover, 3 and 2 are the most vulnerable.

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Abstract

The variety of damage caused by earthquakes in different places is a reason to think about pre-crisis situations. How has social justice and spatial justice been in this land, and how has the structure of the political economy governing this geography been organized, that the occurrence of a natural phenomenon such as an earthquake leads to many human and natural disasters. In recent years, one of the most important components considered by city planners to reduce earthquake damage has been social and symbolic capital and its spatial reproduction. This concept is often associated with civil participation and parallel to cooperation and integration networks, but other very abstract concepts are associated with social capital, such as: cohesion, trust, trade-offs and institutional efficiency. The current research is carried out in a descriptive and analytical method and the operational field of the research test is in the three spatial scales of the neighborhood, the street and the entire area of ​​a city in Tabriz. They play an important role in reducing vulnerability caused by earthquakes.