Multifractal analysis for seismic wave in Kathmandu valley after Gorkha Earthquake-2015, Nepal

Authors

  • B. R. Tiwari State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China-100190
  • J. Xu State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China-100190
  • B. Adhikari St. Xavier’s College, Maitighar, Kathmandu, Nepal
  • N. P. Chapagain Amrit Campus, Tribhuvan University, Kathmandu, Nepal

DOI:

https://doi.org/10.3126/jnphyssoc.v6i2.34866

Keywords:

Seismic waves, Strong ground motion, Singularity spectrum, Multifractal analysis

Abstract

We applied the multiscale signal processing technique, the Wavelet Transform Modulus Maxima (WTMM) to characterize high frequency properties of strong motion waveforms, in particular the temporal distribution and strength of singularities in Gorkha earthquake, 25th April 2015. We first explored their relation to earthquake data source. Then we applied the WTMM analysis to strong motion recordings. These showed that the timing and exponent of singularities measured by the WTMM method on the ground motion wave field are directly related to the position and exponent of assumed initial stress singularities on the fault plane. We found strong motion recordings at near the epicenter site have very high multifractality than far sites. Some differences and similarities among sites were successfully detected.

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Author Biographies

B. Adhikari, St. Xavier’s College, Maitighar, Kathmandu, Nepal

Department of Physics

N. P. Chapagain, Amrit Campus, Tribhuvan University, Kathmandu, Nepal

Department of Physics

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Published

2020-12-31

How to Cite

Tiwari, B. R., Xu, J., Adhikari, B., & Chapagain, N. P. (2020). Multifractal analysis for seismic wave in Kathmandu valley after Gorkha Earthquake-2015, Nepal. Journal of Nepal Physical Society, 6(2), 113–120. https://doi.org/10.3126/jnphyssoc.v6i2.34866

Issue

Vol. 6 No. 2 (2020)

Section

Articles

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