Array Based Earthquakes-Explosion Discrimination Using Diffusion Maps

Y. Bregman, O. Lindenbaum, N. Rabin

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, an advanced machine learning technique named diffusion maps is applied for array-based earthquake-explosion discrimination. We rely on prior work that utilizes the diffusion map-based discrimination approach for data collected from a single seismometer. The discrimination task is an essential component of the Comprehensive Nuclear-Test-Ban Treaty verification regime and since many of the International Monitoring System (IMS) stations consist of arrays, the extension to array based processing is of interest. The proposed method includes a pre-processing step, which constructs time–frequency representations of the P-wave and S-wave seismograms followed by a non-linear dimensionality reduction step. Discrimination is performed in the low-dimensional space. The performance of the presented algorithm is demonstrated on a data set from Southern Israel, recorded at the IMS seismic array of Mt. Meron (MMAI). We show that the diffusion maps-based approach enables to enhance the discrimination capabilities of seismic arrays, even when processing low-magnitude events.

Original languageEnglish
Pages (from-to)2403-2418
Number of pages16
JournalPure and Applied Geophysics
Volume178
Issue number7
DOIs
StatePublished - Jul 2021

Keywords

  • Seismic array
  • diffusion maps
  • machine learning
  • seismic discrimination
  • seismic monitoring and Test-Ban Treaty verification

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