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

  • 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
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.

Downloads

Download data is not yet available.
Abstract
424
pdf
181

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

Published
2020-12-31
How to Cite
Tiwari, B., Xu, J., Adhikari, B., & Chapagain, N. (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
Section
Articles