Multifractal detrended fluctuation analysis (Mf-Dfa) and anomalies in geomagnetic total field intensity prior to Mw~5.5 earthquake
By: Chetia, Timangshu
.
Contributor(s): Baruah, Saurabh.
Publisher: New Delhi CSIR 2022Edition: Vol.60(3), Mar.Description: 193-197p.Subject(s): Humanities and Applied SciencesOnline resources: Click here
In:
Indian journal of pure & applied physics (IJPAP)Summary: n the research article, we report the anomalies observed in geomagnetic total field intensity (BTotal) prior to Mw 5.5
Kokrajhar event. The multifractal analysis was scrutinized to reveal the underlying dynamics in the Geomagnetic Total field
intensity time series. The multifractal spectrum on the day when the event occurred (TEvent day) and its surrogate (TSurrogate)
was investigated to understand the behavior and dynamics hidden in BTotal time series. A significant variation in the
multifractal spectrum was observed between TDay one (multifractal spectrum a day prior to the event) and TEvent day. It was also
observed that the mulfractality of BTotal when the event occurred (TEvent day) got stronger than the multifractality of TDay one
and was sourced from low values distribution. The multifractality in TDay one and TEvent day time series was not from source
type long range correlation or sourced from broad probability density function. The investigation also manifests some non-
linear features which probably evinces the anomalies to be seismic induced. The observations are elaborately emphasized in
the article. The study scrutinizes the underlying dynamics in geomagnetic field intensity time series for earthquake
precursory and forecast studies.
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School of Engineering & Technology Archieval Section | Not for loan | 2022-1888 |
n the research article, we report the anomalies observed in geomagnetic total field intensity (BTotal) prior to Mw 5.5
Kokrajhar event. The multifractal analysis was scrutinized to reveal the underlying dynamics in the Geomagnetic Total field
intensity time series. The multifractal spectrum on the day when the event occurred (TEvent day) and its surrogate (TSurrogate)
was investigated to understand the behavior and dynamics hidden in BTotal time series. A significant variation in the
multifractal spectrum was observed between TDay one (multifractal spectrum a day prior to the event) and TEvent day. It was also
observed that the mulfractality of BTotal when the event occurred (TEvent day) got stronger than the multifractality of TDay one
and was sourced from low values distribution. The multifractality in TDay one and TEvent day time series was not from source
type long range correlation or sourced from broad probability density function. The investigation also manifests some non-
linear features which probably evinces the anomalies to be seismic induced. The observations are elaborately emphasized in
the article. The study scrutinizes the underlying dynamics in geomagnetic field intensity time series for earthquake
precursory and forecast studies.
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