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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Journal of Volcanology and Seismology</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Volcanology and Seismology</journal-title><trans-title-group xml:lang="ru"><trans-title>Вулканология и сейсмология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0203-0306</issn><issn publication-format="electronic">3034-5138</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">684424</article-id><article-id pub-id-type="doi">10.31857/S0203030624050066</article-id><article-id pub-id-type="edn">HNEQZM</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Morphology and tectonics of Icelandic rifts western branch</article-title><trans-title-group xml:lang="ru"><trans-title>Морфология и тектоника западной ветви рифтов Исландии</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bogoliubskii</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Боголюбский</surname><given-names>В. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>The Earth Science Museum; Faculty of Geology</p></bio><bio xml:lang="ru"><p>Музей землеведения; Геологический факультет</p></bio><email>bogolubskiyv@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dubinin</surname><given-names>E. P.</given-names></name><name xml:lang="ru"><surname>Дубинин</surname><given-names>Е. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>The Earth Science Museum; Faculty of Geology; Faculty of Geography</p></bio><bio xml:lang="ru"><p>Музей землеведения; Геологический факультет; Географический факультет</p></bio><email>edubinin08@rambler.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lukashov</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Лукашов</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Faculty of Geography</p></bio><bio xml:lang="ru"><p>Географический факультет </p></bio><email>smoluk@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-17" publication-format="electronic"><day>17</day><month>12</month><year>2024</year></pub-date><issue>5</issue><fpage>76</fpage><lpage>94</lpage><history><date date-type="received" iso-8601-date="2025-06-15"><day>15</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0203-0306/article/view/684424">https://journals.eco-vector.com/0203-0306/article/view/684424</self-uri><abstract xml:lang="en"><p>Iceland is a unique example of a place, where rift zone of Mid-Atlantic Ridge appears onshore. Its morphological and tectonic features considerably differ from typical mid-oceanic ridge rift zones. The morphology and geodynamics of Icelandic rift western branch are formed by Iceland plume thermal influence that generated the North Atlantic Large Igneous Province. Icelandic rift western branch is characterized by ceasing tectonic and magmatic activity. Overlapping with the Eastern Rift Zone it forms rotating block of Hreppar Microplate that leads to tectono-magmatic activity decline northwards. Based on morphometric analysis of normal faults, the relative activity degree of individual parts of volcanic systems was revealed. For some parts, the activity changes in late Quaternary were traced. Obtained inferences demonstrate explicit differences in contemporary tectonic structure and dynamics of the rift zones and volcanic systems within them. For instance, transtensive Reykjanes Rift Zone, the southernmost one, has decreasing eastwards tectono-magmatic activity, which is connected with influence decrease of Reykjanes Ridge adjoining from the south-west. Its gradual southward shifting is observed that is explained by similar southward propagation of the most active Eastern Rift Zone and by the formation of new transtensive zone aggregating contemporary Reykjanes Rift Zone and South-Iceland Seismic Zone. In contrast, the Western Rift Zone develops independently from Reykjanes Rift Zone. It has the largest extension center in the area of Thingvallavatn Lake. In its northern part as within the Central Rift Zone, Holocene tectono-magmatic activity is very faint and is linked to glacioisostatic reactivation of more ancient structures. Revealed structural heterogeneities are traced in rift zone morphology as well. For example, within Western and Central Rift Zones, well-developed shield volcanoes are common. They consist of hyaloclasts predominantly. Within fissure swarms, individual lava shields are observed. In contrast, Reykjanes Rift Zone is characterized by absence of topographically expressed central volcanoes, and within fissure swarms, the chains of volcanic cones are present.</p></abstract><trans-abstract xml:lang="ru"><p>Исландия – уникальный пример, где рифтовая зона Срединно-Атлантического хребта выходит на поверхность суши, а ее морфология и тектоническое строение значительно отличаются от типичных рифтовых зон срединно-океанических хребтов. Морфология и геодинамика западной ветви исландских рифтов во многом обусловлены термическим влиянием Исландского плюма, сформировавшего Северо-Атлантическую крупную магматическую провинцию. Западная ветвь рифтов Исландии характеризуется уже затухающей тектонической и магматической активностью. Перекрываясь с Восточной рифтовой зоной, она формирует вращающийся блок микроплиты Хреппар, что приводит к уменьшению ее тектоно-магматической активности к северу. На основании морфометрического анализа сбросовых уступов выявлен относительный уровень современной активности отдельных участков вулканических систем, а для некоторых участков – зафиксированы его изменения в позднечетвертичное время. Полученные выводы показывают отчетливые различия в современном тектоническом строении и динамике рифтовых зон и отдельных вулканических систем в их пределах. Наиболее южная, транстенсивная Рейкьянесская рифтовая зона имеет убывающую в восточном направлении тектоно-магматическую активность, что связано с уменьшением влияния прилегающего с юго-запада хребта Рейкьянес. Наблюдается постепенное ее смещение в южном направлении, что, по-видимому, обусловлено аналогичным южным продвижением наиболее активной Восточной рифтовой зоны и формированием новой транстенсивной зоны, объединяющей современные Рейкьянесскую рифтовую и Южно-Исландскую сейсмическую зоны. Западная рифтовая зона функционирует независимо от Рейкьянесской, имея крупнейший центр растяжения в районе озера Тингвадлаватн. В северной же ее части, как и в пределах Центральной рифтовой зоны, голоценовые проявления тектоно-магматической активности очень слабы и во многом связаны с гляциоизостатической реактивизацией более древних структур. Выявленные неоднородности строения прослеживаются и в морфологическом облике рифтовых зон. Так, для Западной и Центральной рифтовых зон характерны хорошо развитые щитовые вулканы, сложенные, преимущественно, гиалокластами, а в пределах семейств трещин наблюдаются отдельные лавовые щитовые постройки. В противоположность этому, Рейкьянесская РЗ характеризуется отсутствием выраженных в рельефе центральных вулканов, а в пределах семейств трещин наблюдаются цепочки небольших вулканических аппаратов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>rift zones</kwd><kwd>spreading axes overlapping</kwd><kwd>transtensive zones</kwd><kwd>Icelandic plume</kwd><kwd>morphometric analysis</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>рифтовые зоны</kwd><kwd>перекрытия спрединговых осей</kwd><kwd>транстенсивные зоны</kwd><kwd>Исландский плюм</kwd><kwd>морфометрический анализ</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of the Russian Federation</institution></institution-wrap></funding-source><award-id>План НИР 01 от 22.01.2016</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Боголюбский В.А., Дубинин Е.П. 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