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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">gtcrust</journal-id><journal-title-group><journal-title xml:lang="ru">Геодинамика и тектонофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Geodynamics &amp; Tectonophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2078-502X</issn><publisher><publisher-name>Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.5800/GT-2021-12-4-0561</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-1372</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СОВРЕМЕННАЯ ГЕОДИНАМИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>RECENT GEODYNAMICS</subject></subj-group></article-categories><title-group><article-title>НАБЛЮДЕНИЕ УЛЬТРАНИЗКОЧАСТОТНЫХ ЭЛЕКТРОМАГНИТНЫХ ИЗЛУЧЕНИЙ ПЕРЕД ЗЕМЛЕТРЯСЕНИЕМ (М=7.8) 13 НОЯБРЯ 2016 Г. В НОВОЙ ЗЕЛАНДИИ</article-title><trans-title-group xml:lang="en"><trans-title>OBSERVATION OF ULF ELECTROMAGNETIC EMISSIONS BEFORE THE M 7.8 NEW ZEALAND EARTHQUAKE OF NOVEMBER 13, 2016</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Саху</surname><given-names>С. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Sahoo</surname><given-names>S. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гандинагар 382009, штат Гуджарат</p></bio><bio xml:lang="en"><p>Sushanta Ku Sahoo</p><p>Gandhinagar 382009, Gujarat State</p></bio><email xlink:type="simple">sushantageo.sahoo@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Катламуди</surname><given-names>М.</given-names></name><name name-style="western" xml:lang="en"><surname>Katlamudi</surname><given-names>M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гандинагар 382009, штат Гуджарат</p></bio><bio xml:lang="en"><p>Gandhinagar 382009, Gujarat State</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Удая Лакшми</surname><given-names>Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Udaya Lakshmi</surname><given-names>G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Хайдарабад 500007, штат Теленгана</p></bio><bio xml:lang="en"><p>Hyderabad 500007, Telangana State</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт сейсмологических исследований</institution><country>Индия</country></aff><aff xml:lang="en"><institution>Institute of Seismological Research</institution><country>India</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Османский университет</institution><country>Индия</country></aff><aff xml:lang="en"><institution>Osmania University</institution><country>India</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>14</day><month>12</month><year>2021</year></pub-date><volume>12</volume><issue>4</issue><fpage>891</fpage><lpage>901</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Саху С.К., Катламуди М., Удая Лакшми Г., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Саху С.К., Катламуди М., Удая Лакшми Г.</copyright-holder><copyright-holder xml:lang="en">Sahoo S.K., Katlamudi M., Udaya Lakshmi G.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.gt-crust.ru/jour/article/view/1372">https://www.gt-crust.ru/jour/article/view/1372</self-uri><abstract><p>С целью изучения электромагнитных предвестников, связанных с землетрясением 13 ноября 2016 г. в Новой Зеландии, проанализированы наземные геомагнитные данные, полученные с использованием трехкомпонентного магнитометра Геомагнитной обсерватории Эйруэлл (Новая Зеландия) (43.474 ° ю.ш., 172.393 ° в.д.) в период с 1 октября по 31 декабря 2016 г. Землетрясение магнитудой 7.8 балла произошло в 54 км к северо-востоку от г. Эмберли , а его эпицентр находился в 158 км от Геомагнитной обсерватории Эйруэлл. Для выявления аномалий магнитных данных проанализированы коэффициент поляризации, фрактальная размерность и основные компоненты ультранизкочастотного магнитного поля (УНЧ) изучаемого района. По временному ряду коэффициента поляризации установлено, что данный показатель был превышен дважды, а именно 20 и 30 октября 2016 года, т.е. до возникновения землетрясения, и имел значение ~1 и более в этих случаях. Поскольку индексы глобальной геомагнитной активности Kp и Dst были в норме, повышенный коэффициент поляризации мог быть связан с фазой подготовки землетрясения, которое произошло 13 ноября 2016 г. Для дальнейшей классификации проведен анализ основных компонентов магнитного поля. Первые три основные компонента дают более 90 % дисперсии исходного временного ряда магнитного поля УНЧ. Установлено, что первый основной компонент хорошо коррелирует с индексом геомагнитной активности Dst (магнитная буря), зарегистрированным в этот период. При этом во втором главном компоненте преобладали ежедневные колебания, являющиеся периодическим компонентом зарегистрированного магнитного поля УНЧ. Временное изменение третьего основного компонента было проанализировано для проверки возможной корреляции между проявлениями геомагнитных возмущений УНЧ и возникновением землетрясения. Фрактальная размерность D и Z компонентов магнитных данных изначально уменьшилась, но вскоре резко увеличилась. Такие изменения наблюдались за три дня до изучаемого землетрясения.</p></abstract><trans-abstract xml:lang="en"><p>We analyzed the ground geomagnetic data obtained from a 3-component fluxgate magnetometer at the Eyrewell Geomagnetic Observatory (New Zealand) (43.474 °S, 172.393 °E) from October 1 to December 31, 2016. The study aimed to investigate electromagnetic precursors associated with the M 7.8 New Zealand earthquake of November 13, 2016. This earthquake occurred 54 km northeast of Amberley (New Zealand). Its epicenter was located 158 km from the Eyrewell Observatory. We used three methods focused on the polarization ratio, fractal dimension and principal component analysis to identify anomalies in the geomagnetic data. The time series showed an enhanced polarization ratio at two times, October 20 and October 30, 2016, i.e. before the occurrence of the New Zealand earthquake, and a value ~1 or more during these instances. Since the global geomagnetic indices Kp and Dst were normal in these cases, the enhanced polarization ratio may be related to the preparation phase of the New Zealand earthquake. To further classify them, we applied the principal component analysis to the magnetic data on component H. The first three principal components showed more than 90 % of the variance of the original ultra-low frequency (ULF) magnetic field time series. The first principal component was found to be well correlated with the storm index (Dst) recorded during this period. Again, the second principal component was dominated by daily variations, which were the periodic component of the recorded ULF magnetic field. The temporal variation of the third principal component was analyzed to verify a possible correlation between the ULF emissions and the occurrence of the earthquake. The fractal dimension of components D and Z of the magnetic data decreased initially and sharply increased three days before the New Zealand earthquake.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>УНЧ</kwd><kwd>коэффициент поляризации</kwd><kwd>фрактальная размерность</kwd><kwd>землетрясения</kwd><kwd>Kp</kwd><kwd>Dst</kwd></kwd-group><kwd-group xml:lang="en"><kwd>ULF</kwd><kwd>polarization ratio</kwd><kwd>fractal dimension</kwd><kwd>earthquakes</kwd><kwd>Kp</kwd><kwd>Dst</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Akinaga Y., Hayakawa M., Liu J.Y., Yumoto K., Hattori K., 2001. A Precursory ULF Signature for the Chi-Chi Earthquake in Taiwan. Natural Hazards and Earth System Sciences 1 (1/2), 33–36. https://doi.org/10.5194/nhess-1-33-2001.</mixed-citation><mixed-citation xml:lang="en">Akinaga Y., Hayakawa M., Liu J.Y., Yumoto K., Hattori K., 2001. 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