{"id":6123,"date":"2026-10-19T09:48:30","date_gmt":"2026-10-19T09:48:30","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-jardfraedi-maarit-kalliokoski\/"},"modified":"2026-10-19T09:48:30","modified_gmt":"2026-10-19T09:48:30","slug":"doktorsvorn-i-jardfraedi-maarit-kalliokoski","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-jardfraedi-maarit-kalliokoski\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed jar\u00f0fr\u00e6\u00f0i &#8211; Maarit Kalliokoski"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p><a href=\"https:\/\/eu01web.zoom.us\/j\/63417078473\"><strong>Streymi<\/strong><\/a><\/p>\n<p><strong>Doktorsefni:<\/strong>\u00a0Maarit Kalliokoski<\/p>\n<p><strong>Heiti ritger\u00f0ar:<\/strong>\u00a0Gj\u00f3skuranns\u00f3knir \u00ed Finnlandi &#8211; m\u00f6guleikar \u00e1 n\u00fdtingu gj\u00f3skulagat\u00edmatals til aldursgreininga jar\u00f0laga og umhverfisbreytinga \u00ed Finnlandi (An outline for Finnish Holocene tephrochronology \u2013 volcanic ash as a dating method in Finland)<\/p>\n<p><strong>Andm\u00e6landi<br \/> <\/strong>Dr. Nicholas Balascio, d\u00f3sent \u00ed jar\u00f0fr\u00e6\u00f0i vi\u00f0 The College of William &amp; Mary \u00ed Williamsburg, Virgin\u00edu, Bandar\u00edkjunum<\/p>\n<p><strong>Lei\u00f0beinendur: <\/strong>\u00a0Dr. Esther Ruth Gu\u00f0mundsd\u00f3ttir, d\u00f3sent vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<br \/> Dr. Timo Saarinen, pr\u00f3fessor vi\u00f0 H\u00e1sk\u00f3lann \u00ed Turku, Finnlandi<\/p>\n<p><strong>Einnig \u00ed doktorsnefnd:<\/strong><strong><br \/> <\/strong>Dr. Stefan Wasteg\u00e5rd, pr\u00f3fessor vi\u00f0 H\u00e1sk\u00f3lann \u00ed Stokkh\u00f3lmi, Sv\u00ed\u00fej\u00f3\u00f0<\/p>\n<p><strong>Doktorsv\u00f6rn st\u00fdrir:<\/strong> Dr. Jukka K\u00e4yhk\u00f6, pr\u00f3fessor \u00ed landfr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3lann \u00ed Turku, Finnlandi<\/p>\n<p>Um er a\u00f0 r\u00e6\u00f0a sameiginlega gr\u00e1\u00f0u \u00e1 milli H\u00e1sk\u00f3la \u00cdslands og H\u00e1sk\u00f3lans \u00ed Turku \u00ed Finnlandi<\/p>\n<p><strong>\u00c1grip<\/strong><\/p>\n<p>Gj\u00f3skulagat\u00edmatal er n\u00e1kv\u00e6m aldursgreiningara\u00f0fer\u00f0 \u00fear sem gj\u00f3skul\u00f6g eru notu\u00f0 til a\u00f0 tengja saman og t\u00edmasetja jar\u00f0l\u00f6g og fornleifar. Gj\u00f3skulagat\u00edmatal \u00e1 r\u00e6tur a\u00f0 rekja til eldvirkra sv\u00e6\u00f0a jar\u00f0arinnar, en \u00fea\u00f0an hefur a\u00f0fer\u00f0in dreifst til fjarl\u00e6gra sv\u00e6\u00f0a. \u00der\u00f3un \u00ed a\u00f0fer\u00f0afr\u00e6\u00f0inni hefur leitt til n\u00fdtingar sm\u00e1s\u00e6rrar gj\u00f3sku (cryptotephra e\u00f0a leynigj\u00f3ska) sem hefur borist langt fr\u00e1 eldvirkum sv\u00e6\u00f0um og myndar \u00f6r\u00feunn \u00f3s\u00fdnileg l\u00f6g \u00ed jar\u00f0l\u00f6gum.<\/p>\n<p>\u00cd \u00feessu doktorsverkefni er leitast vi\u00f0 a\u00f0 kanna m\u00f6guleika \u00e1 notkun sm\u00e1s\u00e6rrar gj\u00f3sku til aldursgreininga \u00ed Finnlandi. \u00deessi ranns\u00f3kn er hin fyrsta sinnar tegundar \u00e1 sm\u00e1s\u00e6rri gj\u00f3sku \u00ed Finnlandi. Meginmarkmi\u00f0i\u00f0 me\u00f0 ranns\u00f3kninni er a\u00f0 byggja upp gj\u00f3skulagat\u00edmatal \u00ed Finnlandi sem myndi n\u00fdtast sem aldursgreiningart\u00e6ki \u00ed umhverfisranns\u00f3knum \u00ed Fenn\u00f3skand\u00edu. \u00cd verkefninu voru 30 m\u00fdrar og st\u00f6\u00f0uv\u00f6tn \u00ed Su\u00f0ur- og Mi\u00f0-Finnlandi k\u00f6nnu\u00f0 me\u00f0 tilliti til tilvistar leynigj\u00f3sku, og n\u00e6r ranns\u00f3knarsv\u00e6\u00f0i\u00f0 fr\u00e1 \u00c1landseyjum \u00ed vestri til landam\u00e6ra Finnlands og R\u00fasslands \u00ed austri. Ni\u00f0urst\u00f6\u00f0ur ranns\u00f3knarinnar leiddu \u00ed lj\u00f3s tilvist leynigj\u00f3skulaga fr\u00e1 19 eldgosum, \u00fear af voru 17 fr\u00e1 \u00edslenskum eldst\u00f6\u00f0vum og tv\u00f6 fr\u00e1 eldfj\u00f6llum \u00ed Alaska. Elsta efnagreinda gj\u00f3skan sem borist hefur til Finnlands er 7000 \u00e1ra g\u00f6mul Heklugj\u00f3ska (Hekla 5), en yngsta gj\u00f3skan mynda\u00f0ist hins vegar \u00ed \u00d6skjugosinu \u00e1ri\u00f0 1875. Finnska gj\u00f3skulagat\u00edmatali\u00f0 spannar \u00fev\u00ed s\u00ed\u00f0ustu 7000 \u00e1r og ni\u00f0urst\u00f6\u00f0ur verkefnisins s\u00fdna a\u00f0 gj\u00f3ska hefur borist tilt\u00f6lulega oft til Finnlands \u00e1 \u00feessu t\u00edmabili.<\/p>\n<p>Ni\u00f0urst\u00f6\u00f0ur ranns\u00f3knarinnar s\u00fdna a\u00f0 m\u00f6rg gj\u00f3skul\u00f6g, eins og Askja 1875, Hekla 1845, Hekla 1510, Landn\u00e1m (Torfaj\u00f6kull), White River Ash, Hekla \u00d6 og Aniakchak hafa dreifst umtalsvert v\u00ed\u00f0ar enn \u00e1\u00f0ur hefur veri\u00f0 \u00feekkt. \u00dear a\u00f0 auki er gj\u00f3skulaginu Hekla Y l\u00fdst \u00ed fyrsta sinn utan \u00cdslands.<\/p>\n<p>Ni\u00f0urst\u00f6\u00f0ur \u00feessa verkefnis er mikilv\u00e6gur grunnur a\u00f0 \u00e1framhaldandi ranns\u00f3knum \u00e1 sm\u00e1s\u00e6rri gj\u00f3sku \u00ed Finnlandi, Fenn\u00f3skand\u00edu og Vestur-Evr\u00f3pu. S\u00e1 fj\u00f6ldi gj\u00f3skulaga sem fundist hefur \u00ed Finnlandi \u00ed \u00feessari ranns\u00f3kn gefur tilefni til og endurspeglar mikla m\u00f6guleika \u00e1 frekari gj\u00f3skuranns\u00f3knum og n\u00fdtingu gj\u00f3skulaga til a\u00f0 t\u00edmasetja jar\u00f0l\u00f6g og umhverfisbreytingar \u00ed Finnlandi.<\/p>\n<p><strong>Um doktorsefni\u00f0<\/strong><\/p>\n<p>Maarit Kalliokoski er f\u00e6dd \u00e1ri\u00f0 1978. H\u00fan flutti til \u00cdslands \u00e1ri\u00f0 1998 og lauk B.Ph.Isl.-gr\u00e1\u00f0u vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2002. S\u00ed\u00f0an \u00fe\u00e1 hefur h\u00fan b\u00fai\u00f0 \u00e1 \u00cdslandi og \u00ed Finnlandi \u00e1 v\u00edxl og stunda\u00f0 jar\u00f0fr\u00e6\u00f0in\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands og H\u00e1sk\u00f3lann \u00ed Turku, \u00fear sem h\u00fan lauk BS-pr\u00f3fi \u00e1ri\u00f0 2011 og MS-pr\u00f3fi \u00e1ri\u00f0 2013. Maarit h\u00f3f dokt\u00f3rsn\u00e1m \u00ed kvarterjar\u00f0fr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3lann \u00ed Turku \u00e1ri\u00f0 2014, en flutti aftur til \u00cdslands \u00e1ri\u00f0 2017 til a\u00f0 sinna ranns\u00f3knum sem styrk\u00feegi vi\u00f0 Norr\u00e6na eldfjallasetri\u00f0 innan Jar\u00f0v\u00edsindastofnunar H\u00e1sk\u00f3la \u00cdslands. H\u00fan h\u00f3f doktorsn\u00e1m \u00e1ri\u00f0 2018 og l\u00fdkur sameiginlegri gr\u00e1\u00f0u fr\u00e1 H\u00e1sk\u00f3la \u00cdslands og H\u00e1sk\u00f3lanum \u00ed Turku. Me\u00f0fram n\u00e1mi hefur Maarit unni\u00f0 sem b\u00f3kmennta\u00fe\u00fd\u00f0andi.<\/p>\n<\/div><\/div>","protected":false},"featured_media":1958,"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":"2020-11-20T15:00:00+00:00","_phd_date_end":"2020-11-20T17:00:00+00:00","_phd_location":"","_phd_admission":"Ver\u00f0ur streymt","_phd_thesis_title":"Gj\u00f3skuranns\u00f3knir \u00ed Finnlandi - m\u00f6guleikar \u00e1 n\u00fdtingu gj\u00f3skulagat\u00edmatals til aldursgreininga jar\u00f0laga og umhverfisbreytinga \u00ed Finnlandi (An outline for Finnish Holocene tephrochronology \u2013 volcanic ash as a dating method in Finland)","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_jardfraedi_maarit_kalliokoski","_phd_source_node_id":"371281","_phd_source_type":"vidburdir","_phd_member_id":560,"footnotes":""},"phd_school":[113,93],"phd_discipline":[115],"class_list":["post-6123","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-jardvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-jardfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6123","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\/6123\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/1958"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6123"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6123"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6123"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}