Possibility of studying geophysical oscillatory processes and perturbations according to the astronomical hours of Fedchenko
DOI:
https://doi.org/10.24028/gzh.0203-3100.v33i1.2011.117322Abstract
On an equipment and software complex of the research institute NAO the long-period oscillations determined by dynamics of the Earth's inner core and of the tidal forces have been confirmed upon the analysis of temporal and spectral sequences of the reading deviations of the astronomical pendulum clock of Fedchenko (ACF). A processing method of the ACF readings has been developed. A model of the ACF reading deviations is proposed to simulate the physical processes determining the dynamics of perturbations. Short-period oscillations associated with spherical and toroidal free oscillations of the Earth have been detected after the strong Sichuan earthquake of 12.05.2008. Seismic waves from earthquakes are detected by abnormally large sudden departures of the ACF readings. A preliminary calibration of the ACF readings by the superconducting gravimeters readings is shown. Characteristics of micro seismic events caused by wind loads were reaffirmed. Anomalies interpreted as a "precursor" has been observed a few minutes before the arrival of seismic wave from certain earthquakes. These anomalies are manifested in a significant reduction of the background dispersion of the ACF readings.References
Баркин Ю. В. Колебания системы ядро - мантия Земли и их отражение в природных процессах . Нелинейный мир: Тез. докл. X меж -дисциплин. науч. конф. 27 июня - 2 июля 2005. Выпуск 10. - Нижний Новгород: ННГУ, 2005. - С. 15.
Демидов В. Е. Время, хранимое как драгоценность. - Москва: Знание, 1977. - 66 с.
Козырева Л.И., Мишина Р.Л., Сидорин А.Я. Организаторы первых инструментальных сейс -мических наблюдений в России: И. Е. Кор -тацци (1837-1903) и Г. В. Левицкий (1852- 1917) // Геофиз. исследования. - 2007. - Вып. 7. - С. 146-147.
Петров Г.М., Пинигин Г. И. Иван Кортацци - астроном Черноморского флота. - Николаев: Атолл, 2006. - 126 с.
Пинигин Г. И., Эраль С. Ф. Династия астрономов Кнорре. - Николаев: Атолл, 2009. - 1 44 с.
Сливинский А. П., Бушуев Ф.А., Калюжный Н.А. Аномалии показаний астрономических часов Федченко перед некоторыми сильными землетрясениями // Сейсм. приборы. - 2009. - Вып. 45, № 1. - С. 62-76.
Сидоренков Н. С. Физика нестабильности вращения Земли. - Москва: Физматлит, 2002. - 384 с.
Peters R. D. Folded Pendulum Measurements of Earth's Free Oscillations. - 2004. - http:// physics.mercer.edu/petepag/eigen.html
Arora B.R., Kamal J., Kumar A., Rawat G., Kumar N., Choubey V. M. First observations of free oscillations of the earth from Indian superconducting gravimeter in Himalaya // Current Sci. - 2008. - 95, № 11. - P. 1611-1617. - http://www.ias. ac.in/currsci/dec102008/1611.pdf
Nath S.K., Bhattacharya S.N., Vyas M., Pal I., Sengupta P., Mitra S., Mohanty W. K., Ganguli S. S. The great Sumatra - Andaman earthquake of 26 December 2004 as perceived from the broadband seismograms of Indian Institute of Technology, Kharagpur Seismological Observatory / Current Sci. - 2005. - 88, № 9. - P. 1381- 1383. - http:/www.ias.ac.in/currscimay102005/ 1381.pdf
Park J., Song T.A., Tromp J., Oka E., Stein S., Roult G., Clevede E., Laske G., Kanamori H., Davis P., Berger J., Braitenberg C., Camp M.V., Lei X., Sun H., Xu H., Rosat S. Earth's Free Oscillations Excited by the 26 December 2004 Sumatra-An-daman Earthquake // Science. - 2005. - 308. - P. 1139 -1144. - http://www.sciencemag. org/cgi/content/full/308/5725/1139
Lei X.E., Sun H. P., Hsu H. T., Shi Y.L. Check of Earth's free oscillations excited by Sumatra-An-daman Large Earthquake and discussions on the anisotropy of inner core // Science in China Series D-Earth Sciences. - 2007. - 50, № 6. - P. 909-917.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2020 Geofizicheskiy Zhurnal
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).