{"id":6414,"date":"2026-10-19T09:48:53","date_gmt":"2026-10-19T09:48:53","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-jardedlisfraedi-sonja-h-m-greiner\/"},"modified":"2026-10-19T09:48:53","modified_gmt":"2026-10-19T09:48:53","slug":"doktorsvorn-i-jardedlisfraedi-sonja-h-m-greiner","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-jardedlisfraedi-sonja-h-m-greiner\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed jar\u00f0e\u00f0lisfr\u00e6\u00f0i – Sonja H. M. Greiner"},"content":{"rendered":"
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Streymi<\/a><\/p>\n

Doktorsefni:<\/strong> Sonja H. M. Greiner<\/p>\n

Heiti ritger\u00f0ar: <\/strong>\u00c1hrif fyrirliggjandi sprungna og tekt\u00f3n\u00edskrar bergspennu \u00e1 kvikuganga (The Influence of Pre-existing Fractures and Tectonic Stress on Magmatic Dikes)<\/p>\n

Andm\u00e6lendur<\/strong>:
Dr. Meredith R. Townsend, lektor vi\u00f0 Lehigh h\u00e1sk\u00f3lann, Bandar\u00edkjunum
Dr. John Browning, d\u00f3sent vi\u00f0 Pontificia Universidad Cat\u00f3lica de Chile h\u00e1sk\u00f3lann, Chile<\/p>\n

Lei\u00f0beinandi: <\/strong>Dr. Freysteinn Sigmundsson, v\u00edsindama\u00f0ur vi\u00f0 Jar\u00f0v\u00edsindastofnun H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Einnig \u00ed doktorsnefnd:
<\/strong>Dr. Steffi Burchardt, pr\u00f3fessor vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3lans \u00ed Upps\u00f6lum, Svi\u00fej\u00f3\u00f0
Dr. Olivier Galland, v\u00edsindama\u00f0ur vi\u00f0 N\u00e1tt\u00faruv\u00edsinda- og st\u00e6r\u00f0fr\u00e6\u00f0ideild \u00d3sl\u00f3arh\u00e1sk\u00f3la, Noregi
Dr. Halld\u00f3r Geirsson, d\u00f3sent vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong> \u00a0Dr. Gu\u00f0finna Th A\u00f0algeirsdottir, pr\u00f3fessor og varadeildarforseti Jar\u00f0v\u00edsindadeildar H\u00cd<\/p>\n

Um er a\u00f0 r\u00e6\u00f0a sameiginlega gr\u00e1\u00f0u me\u00f0 Uppsala h\u00e1sk\u00f3lanum \u00ed Sv\u00ed\u00fej\u00f3\u00f0.<\/p>\n

\u00c1grip<\/strong><\/p>\n

Kvikugangar eru mikilv\u00e6gir innvi\u00f0ir virkra eldst\u00f6\u00f0va og flytja kviku dj\u00fapt \u00far r\u00f3tum eldst\u00f6\u00f0va til yfirbor\u00f0s. Breytileiki i aflfr\u00e6\u00f0ilegum eiginleikum jar\u00f0skorpunnar hefur \u00e1hrif \u00e1 hvernig kvikugangar myndast og \u00fer\u00f3ast, og mikilv\u00e6gt er a\u00f0 skilja betur hvernig \u00feessi breytileiki getur haft \u00e1hrif \u00e1 m\u00f6gulega eldvirkni. \u00deetta doktorsverkefni kannar s\u00e9rstaklega \u00e1hrif breytileika \u00ed ger\u00f0 jar\u00f0skorpunnar \u00e1 kvikuinnskot.<\/p>\n

\u00c1hersla er l\u00f6g\u00f0 \u00e1 a\u00f0 kanna samspil \u00e1 milli innskota og misgengja og sprungna sem fyrir eru \u00ed berggrunninum og \u00e1hrif spennisvi\u00f0s vegna flekahreyfinga. Bas\u00edskir kvikugangar sem hafa skotist inn \u00ed m\u00f3berg og sj\u00e1 m\u00e1 \u00ed \u00fatkulnu\u00f0u eldst\u00f6\u00f0inni \u00ed Dyrfj\u00f6llum, Bogafir\u00f0i eystra, voru kortlagg\u00f0ir me\u00f0 ger\u00f0 \u00fer\u00edv\u00edddarl\u00edkana af sv\u00e6\u00f0inu.<\/p>\n

Ni\u00f0urst\u00f6\u00f0urnar s\u00fdna a\u00f0 kvikugangar geta fylgt sprungunum, \u00feeir geta breytt stefnu sinni \u00feegar \u00feeir koma a\u00f0 sprungu e\u00f0a \u00feeir geta stoppa\u00f0 fyrir framan sprungu. L\u00edk\u00f6n voru ger\u00f0 \u00ed tilraunastofu af myndun og \u00fer\u00f3un kvikuganga \u00ed jar\u00f0skorpu sem inniheldur sprungur og veikleika. \u00deau l\u00edk\u00f6n s\u00fdna a\u00f0 munur \u00e1 styrkleika jar\u00f0skorpu me\u00f0 og \u00e1n sprungna, sem og samheldni (e. cohesion) jar\u00f0skorpunnar hefur mikil \u00e1hrif \u00e1 hvort og hvernig misgengi hafa \u00e1hrif \u00e1 kvikuganga. Misgengi \u00ed jar\u00f0skorpunni breyta l\u00edka munstri og st\u00e6r\u00f0 yfirbor\u00f0shreyfinga samfara kvikuinnskotum. \u00de\u00e1 voru ger\u00f0 reiknil\u00edk\u00f6n me\u00f0 b\u00fataa\u00f0fer\u00f0 (e. Finite Element Method) af myndun kvikuganga \u00ed spennusvi\u00f0i vegna flekahreyfinga. Sl\u00edk l\u00edk\u00f6n voru borin saman vi\u00f0 jar\u00f0skorpuhreyfingar sem m\u00e6ldust \u00feegar kvikugangur mynda\u00f0ist \u00ed febr\u00faar-mars 2021 vi\u00f0 Fagradalsfjall.<\/p>\n

Ni\u00f0ursta\u00f0an af \u00feeim samanbur\u00f0i er a\u00f0 togspenna vegna flekahreyfinga getur veri\u00f0 megin drifkraftur kvikuinnskota. Opnun og sk\u00fafhreyfing \u00e1 kvikugangsfletinum skv. reiknil\u00edk\u00f6num er samb\u00e6rileg vi\u00f0 \u00fea\u00f0 sem m\u00e1 \u00e1\u00e6tla \u00fat fr\u00e1 jar\u00f0fr\u00e6\u00f0ilegum a\u00f0st\u00e6\u00f0um \u00e1 Reykjanesskaganum og sk\u00e1reki flekahreyfinga (e. oblique spreading) \u00fear.<\/p>\n

\u00deetta doktorsverkefni s\u00fdnir a\u00f0 samverkan kvikuganga og breytileika \u00ed aflfr\u00e6\u00f0ilegum eiginleikum jar\u00f0skorpunnar er mj\u00f6g fl\u00f3kin og \u00fea\u00f0 a\u00f0 nota mismunandi ranns\u00f3knara\u00f0fer\u00f0ir er lykill a\u00f0 auknum skilningi \u00e1 sl\u00edkri samverkan.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Sonja Greiner f\u00e6ddist 1995 \u00ed Marburg an der Lahn \u00ed \u00de\u00fdskalandi og \u00f3lst upp \u00ed n\u00e1grannab\u00e6num Am\u00f6neburg, \u00fear sem h\u00fan lauk framhaldssk\u00f3lapr\u00f3fi fr\u00e1 Gymnasium Stiftsschule St. Johann \u00e1ri\u00f0 2014.<\/p>\n

H\u00fan lauk BS-gr\u00e1\u00f0u \u00ed e\u00f0lisfr\u00e6\u00f0i fr\u00e1 Philipps-Universit\u00e4t Marburg \u00e1ri\u00f0 2018 og h\u00f3f svo MS-n\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2019 og lauk \u00fev\u00ed \u00e1ri\u00f0 2021. H\u00fan h\u00f3f doktorsn\u00e1m vi\u00f0 H\u00cd \u00ed j\u00fal\u00ed \u00e1ri\u00f0 2021 og hefur b\u00fai\u00f0 \u00ed Reykjav\u00edk, Uppsala og Osl\u00f3 me\u00f0an \u00e1 n\u00e1minu st\u00f3\u00f0.<\/p>\n<\/div><\/div>","protected":false},"featured_media":5801,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2025-06-13T09:30:00+00:00","_phd_date_end":"2025-06-13T11:30:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0arsalur","_phd_admission":"\u00d6ll velkomin","_phd_thesis_title":"\u00c1hrif fyrirliggjandi sprungna og tekt\u00f3n\u00edskrar bergspennu \u00e1 kvikuganga (The Influence of Pre-existing Fractures and Tectonic Stress on Magmatic Dikes)","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_jardedlisfraedi_sonja_h_m_greiner","_phd_source_node_id":"441499","_phd_source_type":"vidburdir","_phd_member_id":955,"footnotes":""},"phd_school":[113,93],"phd_discipline":[114],"class_list":["post-6414","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-jardvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-jardedlisfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6414","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6414\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/5801"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6414"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6414"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}