A M_(S)6.8 earthquake occurred on 5th September 2022 in Luding county,Sichuan,China,at 12:52 Beijing Time(4:52 UTC).We complied a dataset of PGA,PGV,and site vS30 of 73 accelerometers and 791 Micro-Electro-Mechanical ...A M_(S)6.8 earthquake occurred on 5th September 2022 in Luding county,Sichuan,China,at 12:52 Beijing Time(4:52 UTC).We complied a dataset of PGA,PGV,and site vS30 of 73 accelerometers and 791 Micro-Electro-Mechanical System(MEMS)sensors within 300 km of the epicenter.The inferred v_(S30)of 820 recording sites were validated.The study results show that:(1)The maximum horizontal PGA and PGV reaches 634.1 Gal and 71.1 cm/s respectively.(2)Over 80%of records are from soil sites.(3)The v_(S30)proxy model of Zhou J et al.(2022)is superior than that of Wald and Allen(2007)and performs well in the study area.The dataset was compiled in a flat file that consists the information of strong-motion instruments,the strong-motion records,and the v_(S30)of the recording sites.The dataset is available at https://www.seismisite.net.展开更多
Site-specific seismic hazard analysis is crucial for designing earthquake resistance structures,particularly in seismically active regions.Shear wave velocity(V_(S))is a key parameter in such analysis,although the eco...Site-specific seismic hazard analysis is crucial for designing earthquake resistance structures,particularly in seismically active regions.Shear wave velocity(V_(S))is a key parameter in such analysis,although the economy and other factors restrict its direct field measurement in many cases.Various V_(S)-SPT-N correlations are routinely incorporated in seismic hazard analysis to estimate the value of V_(S).However,many uncertainties question the reliability of these estimated V_(S)values.This paper comes up with a statistical approach to take care of such uncertainties involved in V_(S)calculations.The measured SPT-N values from all the critical boreholes were converted into statistical parameters and passed through various correlations to estimate V_(S)at different depths.The effect of different soil layers in the boreholes on the V_(S)estimation was also taken into account.Further,the average shear wave velocity of the top 30 m soil coverV_(S30))is estimated after accounting for various epistemic and aleatoric uncertainties.The scattering nature of the V_(S)values estimated using different V_(S)-N correlations was reduced significantly with the application of the methodology.Study results further clearly demonstrated the potential of the approach to eliminate various uncertainties involved in the estimation of V_(S)30 using general and soil-specific correlations.展开更多
基金supported by the National Natural Science Foundation of China(No.42120104002)the Program of China-Pakistan Joint Research Center on Earth Sciences.
文摘A M_(S)6.8 earthquake occurred on 5th September 2022 in Luding county,Sichuan,China,at 12:52 Beijing Time(4:52 UTC).We complied a dataset of PGA,PGV,and site vS30 of 73 accelerometers and 791 Micro-Electro-Mechanical System(MEMS)sensors within 300 km of the epicenter.The inferred v_(S30)of 820 recording sites were validated.The study results show that:(1)The maximum horizontal PGA and PGV reaches 634.1 Gal and 71.1 cm/s respectively.(2)Over 80%of records are from soil sites.(3)The v_(S30)proxy model of Zhou J et al.(2022)is superior than that of Wald and Allen(2007)and performs well in the study area.The dataset was compiled in a flat file that consists the information of strong-motion instruments,the strong-motion records,and the v_(S30)of the recording sites.The dataset is available at https://www.seismisite.net.
文摘Site-specific seismic hazard analysis is crucial for designing earthquake resistance structures,particularly in seismically active regions.Shear wave velocity(V_(S))is a key parameter in such analysis,although the economy and other factors restrict its direct field measurement in many cases.Various V_(S)-SPT-N correlations are routinely incorporated in seismic hazard analysis to estimate the value of V_(S).However,many uncertainties question the reliability of these estimated V_(S)values.This paper comes up with a statistical approach to take care of such uncertainties involved in V_(S)calculations.The measured SPT-N values from all the critical boreholes were converted into statistical parameters and passed through various correlations to estimate V_(S)at different depths.The effect of different soil layers in the boreholes on the V_(S)estimation was also taken into account.Further,the average shear wave velocity of the top 30 m soil coverV_(S30))is estimated after accounting for various epistemic and aleatoric uncertainties.The scattering nature of the V_(S)values estimated using different V_(S)-N correlations was reduced significantly with the application of the methodology.Study results further clearly demonstrated the potential of the approach to eliminate various uncertainties involved in the estimation of V_(S)30 using general and soil-specific correlations.
