Calculation of seismicity parameters and strong ground movement in Lorestan province (Boroujerd city) based on seismic data

The study is aimed to investigate earthquake hazard zoning in Boroujerd with emphasis on urban development based on Deh Cheshmeh earthquake. The study area is located in the Zagros and Sanandaj zones in Sirjan tectonically and has a relatively high seismic activity. To study seismicity and seismic hazard analysis within a range of 200 km, the deterministic and probabilistic methods and Zare’s updated reduction relationship and Norouzi relationship have been used. In this study, raw catalogs from reputable databases such as ISC and USGS were used, and Gardner and Knopoff ( 1974 ) methods were used to eliminate dependent earthquakes. Seismic parameters were completed through using the method provided by Kiko and were the basis for analysis. The results showed that the maximum horizontal accelerations obtained in the deterministic approach were 0.23, 0.18, and 0.17 g, respectively, which were related to the High Zagros Fault (H.Z.F), Nahavand fault, and Doroud fault, respectively. Also, the maximum vertical accelerations obtained in the deterministic approach were 0.11, 0.09, and 0.08 g, respectively, which were related to the High Zagros (H.Z.F), Nahavand fault, and Doroud fault, respectively. Also, in the probabilistic approach and at the DBE design level, the maximum horizontal and vertical accelerations were 0.30 and 0.14 g, respectively, and at the OBE design level, the above components were 0.22 and 0.10 g, respectively. By using the results of this research that is gained through the possible method of maximum horizontal acceleration 0.3 and in deterministic method 0.23g, 0.13 and 0.34 decrease can be seen in base shear.