gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2015-6-1-0171gtcrust-33Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSОЦЕНКА АСИММЕТРИЧНОГО ВЕРТИКАЛЬНОГО ИЗМЕНЕНИЯ ЮЖНОГО И СЕВЕРНОГО ПОЛУШАРИЙ ЗЕМЛИESTIMATION OF THE ASYMMETRIC VERTICAL VARIATION OF THE SOUTHERN AND NORTHERN HEMISPHERES OF THE EARTHШеньВэнь БиньShenWen-Bin

Ph.D. in Physical Geodesy Department of Geophysics, School of Geodesy and Geomatics / Key Laboratory of Geospace Environment and Geodesy of Ministry of Education, Wuhan University Wuhan 430079, China

wbshen@sgg.whu.edu.cnСуньЖунSunRong

Ph.D. Department of Geophysics, School of Geodesy and Geomatics / Key Laboratory of Geospace Environment and Geodesy of Ministry of Education, Wuhan University Wuhan 430079, China

rsun@whu.edu.cnБаркинЮ.BarkinYu.

д.ф.-м.н., профессор, в.н.с.

Doctor of Physics and Mathematics, Professor, Lead Researcher The Sternberg Astronomical Institute, Lomonosov Moscow State University 13 Universitetsky prospect, Moscow 119992, Russia Tel.: (495)-939-50-24

barkin@inbox.ruШеньЗи-ЮShenZi-Yu

B.S. degree in Metallurgical Engineering Department of Geophysics, School of Geodesy and Geomatics / Key Laboratory of Geospace Environment and Geodesy of Ministry of Education, Wuhan UniversityWuhan 430079, China

Отделение геофизики, школа геодезии и геоматики / Лаборатория Геокосмических окружающей среды и геодезии Министерства образования, Университет города Ухань, Ухань, Китай Государственная лаборатория информационной техники в геодезии, картографии и дистанционном зондирования, Университет города Ухань, Ухань, КитайChinaОтделение геофизики, школа геодезии и геоматики / Лаборатория Геокосмических окружающей среды и геодезии Министерства образования, Университет города Ухань, Ухань, КитайChinaГосударственный астрономический институт им. П.К. Штернберга Московского государственного университета им. М.В. Ломоносова, Москва, РоссияRussian Federation201505092015614561Copyright © Шень В., Сунь Ж., Баркин Ю., Шень З., 20152015Шень В., Сунь Ж., Баркин Ю., Шень З.Shen W., Sun R., Barkin Y., Shen Z.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/33

В предыдущих геодезических исследованиях считалось, что Северное полушарие испытывает тенденцию сжатия, а Южное полушарие, наоборот, расширения. В данной работе аналогичные исследования были проведены на основе трех различных методов. Для расчета средних вертикальных изменений этих двух полушарий мы использовали поле скоростей в Международной земной системе координат (ITRF) в эпоху 2008. Наши результаты показали, что в Северном полушарии из-за деформации происходит расширение со средней скоростью около 1 мм/год, а Южное полушарие испытывает сжатие со скоростью на порядок меньше скорости расширения. После исключения из рассмотрения эффекта постледникового отскока было установ­лено, что темпы расширения и сжатия Северного и Южного полушарий составляют 0.46 мм/год и –0.19 мм/год, соответственно. Преобразование между полями скоростей для двух международных систем координат ITRF 2008 и ITRF 2000 может объяснить, почему разные авторы делают различные выводы о характере расширения / сжатия Северного и Южного полушарий. Тем не менее, в целом, Земля расширяется со скоростью около 0.2 мм/год, что совпадает с нашими предыдущими исследованиями. Были рассчитаны также средние скорости изменения радиуса Земли в зависимости от широты.

 

In previous studies, the northern hemisphere of the Earth is considered to be in compression while the southern one is in expansion. In this study, based on three different methods, we calculate average vertical variations of the two hemispheres from velocity field data under the ITRF2008 (International Terrestrial Reference Frame 2008) solution. Results show that the northern hemisphere is in expansion at the rate about 1 mm/yr, while the compression rate of the southern hemisphere is one order smaller than the expansion rate of the northern one. After the post glacial rebound effect is subtracted, results show that the expansion and compression rates of the northern and southern hemispheres are 0.46 mm/yr and –0.19 mm/yr, respectively. Transformation between the velocity fields under ITRF2008 and ITRF2000 can explain why different authors have different conclusions about the expan­sion/compression pattern of one hemisphere or the other. Anyway, the entire Earth is expanding at a rate about 0.2 mm/yr, and this estimation coincides with results of our previous studies. The mean variation rates of the radii at different latitudes have been calculated.

 

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The authors declare that there are no conflicts of interest present.