29 شهریور 1400

پویا منشور

مرتبه علمی:
نشانی: دانشکده علوم و فناوری نانو و زیستی - گروه فیزیک
تحصیلات: فیزیک
تلفن:
دانشکده: دانشکده علوم و فناوری نانو و زیستی

مشخصات پژوهش

عنوان Anomalous fluctuations of vertical velocity of Earth and their possible implications for earthquakes
نوع پژوهش مقالات در نشریات
کلیدواژه‌ها
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مجله PHYSICAL REVIEW E
شناسه DOI 10.1103/PhysRevE.82.036105
پژوهشگران پویا منشور (نفر اول) ، فاطمه قاسمی (نفر دوم) ، Takishi Matsumoto (نفر سوم) ، J. Gomez (نفر چهارم) ، Muhammad Sahimi (نفر پنجم) ، A. F. Pacheco (نفر ششم به بعد) ، Joachim Peinke (نفر ششم به بعد) ، محمدرضا رحیمی تبار (نفر ششم به بعد)

چکیده

High-quality measurements of seismic activities around the world provide a wealth of data and information that are relevant to understanding of when earthquakes may occur. If viewed as complex stochastic time series, such data may be analyzed by methods that provide deeper insights into their nature, hence leading to better understanding of the data and their possible implications for earthquakes. In this paper, we provide further evidence for our recent proposal [P. Manshour et al., Phys. Rev. Lett. 102, 014101 (2009)] for the existence of a transition in the shape of the probability density function (PDF) of the successive detrended increments of the stochastic fluctuations of Earth’s vertical velocity Vz, collected by broadband stations before moderate and large earthquakes. To demonstrate the transition, we carried out extensive analysis of the data for Vz for 12 earthquakes in several regions around the world, including the recent catasrophic one in Haiti. The analysis supports the hypothesis that before and near the time of an earthquake, the shape of the PDF undergoes significant and discernable changes, which can be characterized quantitatively. The typical time over which the PDF undergoes the transition is about 5–10 h prior to a moderate or large earthquake