Modeling of the strong ground motion of 25th April 2015 Nepal earthquake using modified semi-empirical technique

Acta Geophysica

Monu Tomer¹  A. Joshi²  M. L. Sharma²  Kuo-Liang Wen²  Sohan Lal²  Sandeep³  Che-Min Lin⁴  Chun-Hsiang Kuo⁵  Parveen Kumar⁶ 

[1] Geological Survey of India;Indian Institute of Technology Roorkee;Institute of Science, Banaras Hindu University;National Central University;National Centre for Research on Earthquake Engineering;Wadia Institute of Himalayan Geology

关键词: Strong motion;    Himalayan seismicity;    Displacement spectra;    Response spectra;    Site amplification;    Modeling;   

DOI  :  10.1007/s11600-018-0140-3

学科分类：地球科学(综合)

来源: Polska Akademia Nauk * Instytut Geofizyki

【 摘 要 】

On 25th April, 2015 a hazardous earthquake of moment magnitude 7.9 occurred in Nepal. Accelerographs were used to record the Nepal earthquake which is installed in the Kumaon region in the Himalayan state of Uttrakhand. The distance of the recorded stations in the Kumaon region from the epicenter of the earthquake is about 420–515 km. Modified semi-empirical technique of modeling finite faults has been used in this paper to simulate strong earthquake at these stations. Source parameters of the Nepal aftershock have been also calculated using the Brune model in the present study which are used in the modeling of the Nepal main shock. The obtained value of the seismic moment and stress drop is 8.26 × 1025 dyn cm and 10.48 bar, respectively, for the aftershock from the Brune model .The simulated earthquake time series were compared with the observed records of the earthquake. The comparison of full waveform and its response spectra has been made to finalize the rupture parameters and its location. The rupture of the earthquake was propagated in the NE–SW direction from the hypocenter with the rupture velocity 3.0 km/s from a distance of 80 km from Kathmandu in NW direction at a depth of 12 km as per compared results.

【 授权许可】

Unknown