## 3 Results  
The possibility of evaluating the seismic performance of the stock of buildings of an urban area from an analysis of the cadastral database contributes information for the management of the effects of the different damage scenarios in a rapid and standardized way. In this respect, the role of Geographical Information System (GIS) in urban natural risks analysis constitutes an effective tool for the integral management of this type of situations. In this sense, the graphical picturing of vulnerability indexes and expected damage in buildings, through a geo-referencing process, makes it possible to recognize the most vulnerable areas of the city and planning different ante-earthquake emergency scenarios (see Figure 5). Thus, the geospatial dissemination of the vulnerability indexes of RC buildings studied in Lorca, obtained according to the improved LM1 method proposed in this work, is described in Figure 6a by means of a density heat map estimation. Similarly, the distribution of expected damage grade obtained according the proposed model for an \(I_{\text{EMS-98}}=\text{VII}\) earthquake can be observed in Figure 6b. In both cases, in spite of the damage distribution not being homogeneous, the modeled results reflect that the most vulnerable areas to a certain seismic action were mainly concentrated in the northeast neighborhoods and the central and southwestern areas of the city, as has been presented in some studies [27; 40]. Precisely, these zones suffered widespread damages in buildings after the 11 May 2011 earthquake, even with the collapse of one entirely residential building [5; 6]. Considering a detailed scale, an example of how this method allows for an analysis of damage scenarios in an individualized way for each building and each neighborhood of the urban area is shown in Figure 7. As can be observed, the above-mentioned evaluation not only depends on the structural characteristics of the building but also on urban parameters such as the relative position within the block of buildings, the relative height between adjoining buildings or the slope of the ground. Therefore, an analysis of the influence of urban planning features in the seismic performance of the structures is necessary in order to obtain an adjusted approach of the damage scenarios. Figure 5: Implementation of cadastral database of reported damage buildings used in this case study. In this sense, the method can be applied in the decision-making process of subjects related to the emergency planning of post-earthquake situations, such as in the areas with major expected damage to buildings, the most suitable location to set up the base management camp or the assistance camps for the population, the operability of basic services and communication lines or the safest evacuation routes available in the city, in a more accurate way for a certain damage scenario. In order to perform a more integral evaluation of the seismic risk, these results can be combined with other aspects related to the seismic hazard assessment, such as microzonation studies which determine the amplification or attenuation of local site effects of the ground motion. In this way,  
Figure 6: (**a**) GIS plotting of density estimation for the vulnerability indexes \(lv_{b}\) of RC buildings evaluated in the city of Lorca, obtained according to the proposed model of the LM1 method. (**b**) GIS plotting of density estimation for the mean damage grades according to the new proposal for an \(I_{\text{EMS-98}}=\text{VII}\) earthquake. Figure 7: Detail of the urban plot in the southwestern part of the city of Lorca, including the vulnerability indexes \(lv_{b}\) of analyzed RC buildings, according to the proposed model. buildings with high vulnerability levels which are placed on soft soils present a considerable amplification of the local site effects and would need certain particularly accurate seismic construction requirements, in order to allow for an adequate behavior of these buildings in case of an earthquake.