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Geodetic constraints on the period of episodic tremors and slips using least squares harmonic estimation method with application to Cascadia subduction zone

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Abstract

It is expected that episodic tremors and slips (ETS) as a type of slow earthquakes with periodic property will be detected using harmonic estimation techniques. The principal goal of this paper is the detection of these kinds of earthquakes using least squares harmonic estimation (LSHE). To accomplish this, the raw time series of 38 permanent GPS stations of the Pacific Northwest Geodetic Array have been analyzed. Previously, some independent techniques could confirm the occurrences of the aforementioned quakes at these stations. However, the current research intends to evaluate the spectrum of each of the de-trended time series using the LS-HE method. In each station, the period of the detected harmonic with the maximum power spectrum is equivalent to the average period previously reported for these events. According to the obtained results, the recurrence interval of these events ranges from 9 months to 3 years. In sum, the study confirms this method being efficient for investigating the occurrences of ETSs when the length of the GPS time series is sufficiently large.

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Authors and Affiliations

  1. Department of Geodesy and Geomatics Engineering, K.N. Toosi University of Technology, Tehran, Iran

    Roya Mousavian & Masoud M. Hossainali

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  1. Roya Mousavian
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  2. Masoud M. Hossainali
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Correspondence to Roya Mousavian.

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Mousavian, R., Hossainali, M.M. Geodetic constraints on the period of episodic tremors and slips using least squares harmonic estimation method with application to Cascadia subduction zone. Acta Geophys. 62, 451–468 (2014). https://doi.org/10.2478/s11600-013-0173-6

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