首页|Rapid determination of source parameters of the M6.2 Jishishan earthquake in Gansu Province and its application in emergency response
Rapid determination of source parameters of the M6.2 Jishishan earthquake in Gansu Province and its application in emergency response
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Rapid determination of source parameters of the M6.2 Jishishan earthquake in Gansu Province and its application in emergency response
In this study,we swiftly determined the focal parameters(focal mechanism,seismic imaging process,magnitude)of the Jishishan earthquake,leveraging a solved fault model to assess the intensity field and casualties promptly.The investigation began by retrieving the source mechanism through the P-wave initial motion and W-phase method.This enabled us to chart the spatial and temporal distribution of energy release in the source area via the back-projection technique.Following this,we estimated the earthquake's intensity field by merging the source inversion findings with the ground motion prediction equation.This analysis facilitated the evaluation of earthquake casualties,utilizing the theoretical intensity field and a casualty assessment model.Our findings indicate that the fault type is a thrust fault,characterized by a unilateral rupture in the direction of NW,with a rupture length spanning approximately 10-15 km and a duration ranging between 8 and 10 s.The earthquake's magnitude varied from M 5.9 to M 6.2.The demarcated high-intensity areas,as per our intensity assessment,align closely with the actual survey results.Furthermore,the predicted total casualties and identified critical rescue zones closely match the real-world casualty figures.These insights offer crucial technical support for govern-mental emergency command and rescue operations.
Source parametersSeismic process imagingEarthquake intensityCasualtiesRapid determinationJishi mountain earthquake
Yijiao Jia、Wenkai Chen、Dengjie Kang、Yuyang Peng、Yanping Sun、Dun Wang
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Lanzhou Institute of Seismology,Lanzhou,730000,Gansu,China
China University of Geosciences(Wuhan),Wuhan,430000,Hubei,China
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