Iraq is not secure from seismic hazards. Earthquakes are likely to happen and may cause substantial damage. Actually, such hazards were happened and recorded after the last earthquake in November 2017(Halabjah earthqu...Iraq is not secure from seismic hazards. Earthquakes are likely to happen and may cause substantial damage. Actually, such hazards were happened and recorded after the last earthquake in November 2017(Halabjah earthquake). Unfortunately, there is a lack of studies concerns the assessment of the earthquake hazard on the soil in Iraq. The available research efforts directed toward the earthquakes and their effects on bridge piers, and traditional commercial buildings of Iraq. A historical view of earthquakes that struck Iraq was presented in this paper. Evaluation of liquefaction susceptibility of poorly graded sand at the southwest of Baghdad, Iraq was studied considering the last earthquake. The NCEER, 1997 workshop procedure using shear wave velocity was used to evaluate liquefaction susceptibility of soil. The variation of safety factor with depth had been investigated at different earthquake magnitudes and accelerations.The study revealed that the soil had a high tendency to liquefaction if subjected to earthquake magnitudes within the ranges that hit Iraq in November 2017. Large attention should be given to the effect of the earthquake on soil foundation in the future for all engineering project that constructed in Iraq.展开更多
At UTC 2017-11-12 18:18:17,an Mw7.3 earthquake occurred at the border between Iran and Iraq(location 34.886°N,45.941°E,depth 23 km according to USGS).We carried out focal mechanism and rupture process studie...At UTC 2017-11-12 18:18:17,an Mw7.3 earthquake occurred at the border between Iran and Iraq(location 34.886°N,45.941°E,depth 23 km according to USGS).We carried out focal mechanism and rupture process studies with the data from IRIS data center,using 26 far-field P-waveforms and 25 SH-waveforms with high S/N ratio and relatively even azimuth coverage(epicentral distance)in a point source model to invert for the focal mechanism solution;the result(Figure1)was used to construct a finite fault model for rupture process inversion(Yao and Ji,1997;Wang et al.,2008),resulting in a preliminary slip distribution of this earthquake(Figures 2-4).The calculated seismic moment is 1.1×1020 N·m,Mw=7.3.The maximum slip is about 700 cm.展开更多
文摘Iraq is not secure from seismic hazards. Earthquakes are likely to happen and may cause substantial damage. Actually, such hazards were happened and recorded after the last earthquake in November 2017(Halabjah earthquake). Unfortunately, there is a lack of studies concerns the assessment of the earthquake hazard on the soil in Iraq. The available research efforts directed toward the earthquakes and their effects on bridge piers, and traditional commercial buildings of Iraq. A historical view of earthquakes that struck Iraq was presented in this paper. Evaluation of liquefaction susceptibility of poorly graded sand at the southwest of Baghdad, Iraq was studied considering the last earthquake. The NCEER, 1997 workshop procedure using shear wave velocity was used to evaluate liquefaction susceptibility of soil. The variation of safety factor with depth had been investigated at different earthquake magnitudes and accelerations.The study revealed that the soil had a high tendency to liquefaction if subjected to earthquake magnitudes within the ranges that hit Iraq in November 2017. Large attention should be given to the effect of the earthquake on soil foundation in the future for all engineering project that constructed in Iraq.
基金supported by the National Natural Science Foundation of China (grants 41630210 and 41474036)
文摘At UTC 2017-11-12 18:18:17,an Mw7.3 earthquake occurred at the border between Iran and Iraq(location 34.886°N,45.941°E,depth 23 km according to USGS).We carried out focal mechanism and rupture process studies with the data from IRIS data center,using 26 far-field P-waveforms and 25 SH-waveforms with high S/N ratio and relatively even azimuth coverage(epicentral distance)in a point source model to invert for the focal mechanism solution;the result(Figure1)was used to construct a finite fault model for rupture process inversion(Yao and Ji,1997;Wang et al.,2008),resulting in a preliminary slip distribution of this earthquake(Figures 2-4).The calculated seismic moment is 1.1×1020 N·m,Mw=7.3.The maximum slip is about 700 cm.
