Parametric Criteria in Onsite Earthquake Early Warning System

نوع مقاله : مقاله پژوهشی‌

نویسنده

Assistant Professor of seismology, Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran

چکیده

In recent years, rapid estimation of Peak Ground Motion (PGM) and Modified Mercalli Intensity (MMI) based on a few seconds of the initial portion of  wave has been studied as the most important part of the onsite Earthquake Early Warning (EEW) systems studies. To establish an onsite EEW, we need the empirical relationship between earthquake size, PGM and epicentral distance in real-time mode. In some EEWs, the epicentral distance is estimated from the amplitude growth rate of a few seconds of P waves. Many studies have empirically confirmed that the growth rate becomes smaller as epicentral distance becomes far. This relation is true regardless of the earthquake size. In the current study, five parametric criteria including , , ,  and  are proposed for quick detection of destructive oncoming strong motions at a specific target based on ground motions of the first 4 seconds of Japan event waveforms where  and  parameters represent the characteristics of  wave envelope curve in a simple function with the form of . In this study, parameter is inversely proportional to epicentral distance which can be readily estimated within a given short time after P waves’ arrival. ,  and  are the initial peak ground acceleration, velocity and displacement, respectively. The current study represent five thresholds parameters including , , ,  and  in order to warn a Peak Ground Velocity ( ) greater than about 10 cm/sec which are clustered in strong shaking with Modified Mercalli Intensity ( ) larger than . Therefore, destructive earthquakes can be detected form the maximum amplitudes and growth rate of few seconds of P waves by using mentioned parametric criteria.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Parametric Criteria in Onsite Earthquake Early Warning System

نویسنده [English]

  • Reza Heidari
Assistant Professor of seismology, Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

In recent years, rapid estimation of Peak Ground Motion (PGM) and Modified Mercalli Intensity (MMI) based on a few seconds of the initial portion of  wave has been studied as the most important part of the onsite Earthquake Early Warning (EEW) systems studies. To establish an onsite EEW, we need the empirical relationship between earthquake size, PGM and epicentral distance in real-time mode. In some EEWs, the epicentral distance is estimated from the amplitude growth rate of a few seconds of P waves. Many studies have empirically confirmed that the growth rate becomes smaller as epicentral distance becomes far. This relation is true regardless of the earthquake size. In the current study, five parametric criteria including , , ,  and  are proposed for quick detection of destructive oncoming strong motions at a specific target based on ground motions of the first 4 seconds of Japan event waveforms where  and  parameters represent the characteristics of  wave envelope curve in a simple function with the form of . In this study, parameter is inversely proportional to epicentral distance which can be readily estimated within a given short time after P waves’ arrival. ,  and  are the initial peak ground acceleration, velocity and displacement, respectively. The current study represent five thresholds parameters including , , ,  and  in order to warn a Peak Ground Velocity ( ) greater than about 10 cm/sec which are clustered in strong shaking with Modified Mercalli Intensity ( ) larger than . Therefore, destructive earthquakes can be detected form the maximum amplitudes and growth rate of few seconds of P waves by using mentioned parametric criteria.

کلیدواژه‌ها [English]

  • Onsite earthquake early warnings
  • KiK-net
  • P wave
  • PGV
  • Parametric criteria

مراجع

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مجله ژئوفیزیک ایران
دوره 14، شماره 4
دی 1399
صفحه 29-39

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