Numerical Modeling of Near Fault Seismic Ground Motion for Denali Fault

Chenna Rajaram and Ramancharla Pradeep Kumar
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Chenna Rajaram: Rajeev Gandhi Memorial College of Engineering and Technology, India
Ramancharla Pradeep Kumar: International Institute of Information Technology, Hyderabad, India

International Journal of Geotechnical Earthquake Engineering (IJGEE), 2021, vol. 12, issue 2, 1-22

Abstract: An effective earthquake (Mw 7.9) struck Alaska on 3 November 2002. This earthquake ruptured 340 km along Susitna Glacier, Denali, and Totschunda faults in Central Alaska. The peak ground acceleration (PGA) was recorded about 0.32 g at station PS10, which was located 3 km from the fault rupture. The PGA would have recorded a high value if more instruments had been installed in the region. A numerical study has been conducted to find out the possible ground motion record that could occur at maximum horizontal slip during the Denali earthquake. The current study overcomes the limitation of number of elements to model the Denali fault. These numerical results are compared with observed ground motions. It is observed that the ground motions obtained through numerical analysis are in good agreement with observed ground motions. From numerical results, it is observed that the possible expected PGA is 0.62 g at maximum horizontal slip of Denali fault.

Date: 2021
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