Seismic Ground Motion Amplification in a 3D Sedimentary Basin: Source Mechanism and Intensity Measures

Parla, Rajesh and Somala, Surendra Nadh (2022) Seismic Ground Motion Amplification in a 3D Sedimentary Basin: Source Mechanism and Intensity Measures. Journal of Earthquake and Tsunami, 16 (04). ISSN 1793-4311

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Abstract

Ground motion ampli¯cation has been observed in most earthquakes triggered near the sediment-¯lled basins such as 2015 Nepal and 1999 Chi–Chi events. Many numerical studies pointed out the e®ect of various parameters such as material properties and geometric features of the basin on ground motion ampli¯cation but the e®ect of the complete range of source mechanism parameters needs to be addressed. This paper presents the e®ect of source mechanism parameters, such as strike, dip, rake angle of fault and moment magnitude (MwÞ on ampli¯cation of ground motion intensity measures (IMs) due to sediment-¯lled basins. It is found out that the maximum spectral ampli¯cation, when subjected to the source of lateral strike mechanism, is 45, whereas for thrust fault mechanism, it is 30. Within the lateral strike mechanism, if the dip angle is increased from 0∘ to 90∘, the spectral ampli¯cation increases from 10 to 30 times. The results also suggested that it is important to consider detailed focal parameters to study basin ampli¯cation. The ampli¯cation of IMs in the basin is more sensitive to variation of dip angle than the other source parameters and the magnitude of earthquake has an insigni¯cant role in basin ampli¯cation. © World Scientific Publishing Company.

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