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Ground motion prediction equations based on shallow crustal earthquakes in Georgia and the surrounding Caucasus

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earthquake Science 2022年第6期35卷 497-509页

作者： Jorjiashvili Nato Shengelia Ia Godoladze Tea Gunia Irakli Akubardia Dimitri Institute of Earth Sciences and National Seismic Monitoring Center Ilia State UniversityTbilisi 0177Georgia

Strong ground motions caused by earthquakes with magnitudes ranging from 3.5 to 6.9 and hypocentral distances of up to 300km were recorded by local broadband stations and three-component accelerograms within Georgia’s enhanced digital seismic *** data mixing is particularly effective in areas where strong ground motion data are *** data were used to produce models based on ground-motion prediction equations(GMPEs),one benefit of which is that they take into consideration information from waveforms across a wide range of *** this study,models were developed to predict ground motions for peak ground acceleration and 5%-damped pseudo-absolute-acceleration spectra for periods between 0.01 and 10 ***-period ground motions decayed faster than long-period motions,though decay was still in the order of approximately 1/*** mechanisms and local soil conditions greatly influence *** spectral acceleration(SA)of thrust faults was higher than that for either strike-slip or normal faults but the influence of strike-slip faulting on SA was slightly greater than that for normal *** soils also caused significantly more amplification than rocky sites.

关键词： strong ground motion peak ground acceleration spectral acceleration shallow earthquake

shallow destructive earthquakes

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earthquake Science 2021年第1期34卷 15-23页

作者： Hongfeng Yang Suli Yao Earth System Science Programme Faculty of ScienceThe Chinese University of Hong KongHong Kong 999077China Shenzhen Research Institute The Chinese University of Hong KongShenzhenGuangdong 518057China

Depths of earthquake occurrence and large slip distribution are critical for seismic hazard *** examples show that earthquakes with similar magnitudes,however,can result in significantly different ground shaking and *** of the critical factors is that whether the large slip was generated near the ground *** this article,we reviewed two aspects that are important on this regard,shallow slip deficit and nucleation *** how shallow future earthquakes may nucleate in particular regions,such as shale gas fields,is critical for hazard *** or not a strong earthquake may slip significantly at shallow depths(less than 3 km)plays crucial rules in seismic hazard preparation and should be further investigated by integrating high-resolution fault zone observations,dynamic rupture simulation,and fault zone ***,precisely resolving shallow depth and slip distribution of earthquakes demands InSAR and/or other image data that can better capture the near-fault deformation to constrain the source parameters of earthquakes.

关键词： shallow earthquake shallow slip deficit nucleation depth seismic hazard assessment

Statistical Analysis on Depth Distribution Model of earthquake Hypocenters

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earthquake Research in China 2002年第2期16卷 113-119页

作者： Xu Guangyin, Gao Mengtan, Yu Yanxiang and Wang JianInstitute of Geophysics, CSB, Beijing 100081, China Institute of Geophysics CSBBeijing 100081China

In order to improve reliability of probabilistic seismic hazard analysis, shallow earthquake (depth <70 km) data, recorded with orientation precision grades 1 and 2 by modern instrument and containing depth informatio... 详细信息

In order to improve reliability of probabilistic seismic hazard analysis, shallow earthquake (depth shallow earthquakes. Considering the differences of depth distribution characteristics of earthquakes with different magnitudes, the following magnitude intervals are adopted to analyze earthquakes with different magnitude scales, respectively: M S=2.0～2.9, M S=3.0～3.9, M S=4.0～4.9, M S=5.0～5.9 and M S=6.0～6.9. The results show that hypocenter depths are normally distributed by and large around the mean depth of the corresponding seismic region. The probabilistic distribution curves of earthquake depth in West China are wider than those in East China. The probabilistic distribution deviation, σ, of West China is greater than those of East China, that is, earthquakes in West China have a wider range in terms of depth. There is also a tendency that the absolute value of mean hypocenter depth increases with the magnitude by and large.

关键词： shallow earthquake Hypocenter depth Distribution model Seismic region Magnitude interval