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Title

A frequency-based parameter for rapid estimation of magnitude

فصلنامه فیزیک تئوری و کاربردی، دوره: 11، شماره: 4
Year: 1396
COI: JR_JTAP-11-4_003
Language: EnglishView: 233
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Authors

Sanam Atefi - Department of Geophysics, Science and Research Branch, Islamic Azad University, Tehran, Iran
Reza Heidari - Department of Geophysics, Science and Research Branch, Islamic Azad University, Tehran, Iran
Noorbakhsh Mirzaei - Institute of Geophysics, University of Tehran, Tehran, Iran
Hamid Reza Siahkoohi - Institute of Geophysics, University of Tehran, Tehran, Iran

Abstract:

This study introduce a new frequency parameter called τ(fcwt), which can be used to estimate earthquake magnitude on the basis of the first few seconds of P-waves, using the waveforms of earthquakes occurring in Japan. This new parameter is introduced using continuous wavelet transform as a tool for extracting the frequency contents carried by the first few seconds of P-wave. The empirical relationship between the logarithm of τ(fcwt) within the initial 4 s of a waveformand magnitude was obtained. To evaluate the precision of τ(fcwt), we also calculated parameters τ(max)(p) and τ(c). The average absolute values of observed and estimated magnitude differences (│M(est) - M(obs│) were 0.43, 0.49, and 0.66 units of magnitude, as determined using τ(max), τ(c), and τ(fcwt), respectively. For earthquakes with magnitudes greater than 6, these values were 0.34, 0.56, and 0.44 units of magnitude, as derived using τ(max) , τ(c), and τ(fcwt), respectively. The τ(fcwt) parameter exhibited more precision in determining the magnitude of moderate- and small-scale earthquakes than did the τ(c)-based approach. For a general range of magnitudes, however, the τ(max)(p) -based method showed more acceptable precision than did the other two parameters.

Keywords:

Early warning systems Continuous wavelet transform Magnitude estimation relation

Paper COI Code

This Paper COI Code is JR_JTAP-11-4_003. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/763689/

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Atefi, Sanam and Heidari, Reza and Mirzaei, Noorbakhsh and Siahkoohi, Hamid Reza,1396,A frequency-based parameter for rapid estimation of magnitude,https://civilica.com/doc/763689

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Type of center: Azad University
Paper count: 37,264
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