caa a22 4500 467936226 CHVBK 20180406152958.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s11069-005-6127-9 doi (NATIONALLICENCE)springer-10.1007/s11069-005-6127-9 Application of the Spatially Smoothed Seismicity and Monte Carlo Methods to Estimate the Seismic Hazard of Eritrea and the Surrounding Region [Elektronische Daten] [L. Hagos, R. Arvidsson, R. Roberts] The region of interest is characterized by incomplete data sets and little information about the tectonic features. Therefore, two methodologies for estimating seismic hazard were used in order to elucidate the robustness of the results: the method of spatially smoothed seismicity introduced by Frankel (1995) and later extended by Lapajne et al. (1997) and a Monte Carlo approach presented by Ebel and Kafka (1999). In the first method, fault-rupture oriented elliptical Gaussian smoothing was performed to estimate future activity rates along the causative structures. Peak ground accelerations were computed for a grid size of 15km × 415km assuming the centre of the grids as epicentres, from which the seismic hazard map was produced. The attenuation relationship by Ambraseys et al. (1996) was found suitable for the region under study. PGA values for 10% probability of exceedence in 50years (return period of 475years) were computed for each model and a combined seismic hazard map was produced by subjectively assigning weights to each of these models. A worst-case map is also obtained by picking the highest value at each grid point from values of the four hazard maps. The Monte Carlo method is used to estimate seismic hazard, for comparison to the results from our previous approach. Results obtained from both methods are comparable except values in the first set of maps estimate greater hazard in areas of low seismicity. Both maps indicate a higher hazard along the main tectonic features of the east African and Red Sea rift systems. Within Eritrea, the highest PGA exceeded a value 25% of g, located north of Red Sea port of Massawa. In areas around the capital, Asmara, PGA values exceed 10% of g. Springer, 2006 spatially smoothed seismicity nationallicence Monte Carlo methods nationallicence seismic hazard nationallicence peak ground acceleration nationallicence Eritrea nationallicence Hagos L. Department of Earth Sciences, Uppsala University, Villavägen 16, SE-752 36, Uppsala, Sweden aut Arvidsson R. Department of Earth Sciences, Uppsala University, Villavägen 16, SE-752 36, Uppsala, Sweden aut Roberts R. Department of Earth Sciences, Uppsala University, Villavägen 16, SE-752 36, Uppsala, Sweden aut Natural Hazards Kluwer Academic Publishers 39/3(2006-12-01), 395-418 0921-030X 39:3<395 2006 39 11069 https://doi.org/10.1007/s11069-005-6127-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11069-005-6127-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hagos L. Department of Earth Sciences, Uppsala University, Villavägen 16, SE-752 36, Uppsala, Sweden aut NATIONALLICENCE 700 1- Arvidsson R. Department of Earth Sciences, Uppsala University, Villavägen 16, SE-752 36, Uppsala, Sweden aut NATIONALLICENCE 700 1- Roberts R. Department of Earth Sciences, Uppsala University, Villavägen 16, SE-752 36, Uppsala, Sweden aut NATIONALLICENCE 773 0- Natural Hazards Kluwer Academic Publishers 39/3(2006-12-01), 395-418 0921-030X 39:3<395 2006 39 11069 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer