جستجوی مقالات مرتبط با کلیدواژه « جنبش نیرومند زمین » در نشریات گروه « فنی و مهندسی »

Green's empirical function method has been used to simulate the strong motion of the Damavand earthquake. One of the conventional methods of simulation to produce strong ground motion is the use of aftershocks and foreshocks of large earthquakes using the empirical Green's function method; As a result, the ground motion simulation algorithm based on Green's empirical function, presented by Hutchings and Wu (1990), has been used to simulate the Damavand earthquake waveform.On 02/18/2019, an earthquake with a magnitude of 5 occurred in Damavand, located in Tehran province. In this study, with the aim of estimating the parameters of the source and the mode of fracture in this earthquake, the empirical Green's function method has been used to simulate the powerful movement of the earth. To simulate the main earthquake, a foreshock with a magnitude of 2.9 near the center of the main earthquake, as well as aftershocks with a magnitude of 3.9 and 4.1 recorded at the Masha and Rodhen accelerometer stations, have been considered as experimental Green's function. The length and width of the fracture in this earthquake are 2 and 3 km, respectively, in the direction of extension and slope. Calculations show that the direction, slope and tilt of the fault that caused the earthquake were 196, 76 and 156.5 degrees, respectively. The focal mechanism of this earthquake is of reverse type with strike-slip component, which is consistent with the mechanism of earthquakes in this area.

Earthquake is the most destructive geohazard causing substantial economic damages and human losses. Seismic hazard analysis is a practical tool for predicting and reducing seismic risk. This study was carried out a seismic hazard assessment of Izeh city for a 50 km radius. For this purpose, geological setting, and active faults, as well as their geometry in this region were investigated. Besides, the seismic history of the city was assessed. The seismic hazard analysis of the studied area was evaluated using the probabilistic approach in different hazard levels. Ground motion parameters (magnitude and peak ground acceleration) were computed for the 5 to 200-year return period and 10, 37, and 64 % probabilities of exceeding. For return periods of 5 to 200-year, results revealed that the magnitude of the design base earthquake (DBE) ranged from 4.79 to 6.58 Richter. Moreover, the magnitude of the maximum credible earthquake (MCE) varied from 5.89 to 7.69 Richter for the return period. Furthermore, the maximum peak ground acceleration (PGA) of design base earthquake and maximum credible earthquake were calculated 0.25 and 0.48g, respectively, using Campbell's attenuation equation. Furthermore, seismic hazard maps of PGA for the study area were produced for 10 and 64% probabilities of exceedance in the 50-year return period. The resulting seismic hazard maps were classified into low, moderate, high, and very high seismic risk. These maps indicated that about 55.54% (10% probability) and 43.13% (64% probability) of the study area belongs to the very high and high classes, respectively.