{"id":6210,"date":"2026-10-19T09:48:38","date_gmt":"2026-10-19T09:48:38","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-jardfraedi-geoffrey-kiptoo-mibei\/"},"modified":"2026-10-19T09:48:38","modified_gmt":"2026-10-19T09:48:38","slug":"doktorsvorn-i-jardfraedi-geoffrey-kiptoo-mibei","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-jardfraedi-geoffrey-kiptoo-mibei\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed Jar\u00f0fr\u00e6\u00f0i &#8211; Geoffrey Kiptoo Mibei"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p><strong>H\u00e1t\u00ed\u00f0arsalur \u00ed A\u00f0albyggingu<\/strong><\/p>\n<p><strong>V\u00f6rninni ver\u00f0ur einnig <a href=\"https:\/\/livestream.com\/hi\/DoktorsvornGeoffreyMibei\">streymt<\/a><\/strong><a href=\"https:\/\/livestream.com\/hi\/DoktorsvornGeoffreyMibei\"><strong><\/strong><\/a><\/p>\n<p><strong>Doktorsefni:<\/strong> Geoffrey Kiptoo Mibei<\/p>\n<p><strong>Heiti ritger\u00f0ar: <\/strong>Gossaga, \u00fer\u00f3un kviku og mat \u00e1 jar\u00f0hita \u00ed eldst\u00f6\u00f0varkerfinu Paka \u00ed nor\u00f0urhluta sigdals Ken\u00eda<\/p>\n<p><strong>Andm\u00e6lendur:\u00a0 <\/strong>Karen Fontjin, d\u00f3sent vi\u00f0 h\u00e1sk\u00f3lann \u00ed Ghent , Belg\u00edu og Agnes Reyes, berg- og jar\u00f0efnafr\u00e6\u00f0ingur vi\u00f0 GNS-Science \u00e1 N\u00fdja Sj\u00e1landi.<\/p>\n<p><strong>Umsj\u00f3narkennari: <\/strong>Halld\u00f3r Geirsson, d\u00f3sent vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n<p><strong>Lei\u00f0beinendur: <br \/><\/strong>Eniko Bali, d\u00f3sent vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands <br \/>Bj\u00f6rn S. Har\u00f0arson, jar\u00f0fr\u00e6\u00f0ingur hj\u00e1 \u00cdSOR<br \/> Hjalti Franzson, jar\u00f0fr\u00e6\u00f0ingur hj\u00e1 \u00cdSOR<strong><br \/><\/strong><\/p>\n<p><strong>Einnig \u00ed doktorsnefnd<\/strong><strong>:<br \/><\/strong>Gu\u00f0mundur H. Gu\u00f0finnsson, fr\u00e6\u00f0ima\u00f0ur vi\u00f0 Jar\u00f0v\u00edsindastofnun H\u00e1sk\u00f3lans<\/p>\n<p><strong>Doktorsv\u00f6rn st\u00fdrir: <\/strong>Freysteinn Sigmundsson, forseti Jar\u00f0v\u00edsindadeildar H\u00cd<strong><\/strong><\/p>\n<p><strong>\u00c1grip<\/strong><\/p>\n<p>\u00cd \u00feessu verkefni er kviku\u00fer\u00f3un og gossaga Paka-eldst\u00f6\u00f0varinnar \u00ed Ken\u00eda ranns\u00f6ku\u00f0 og jar\u00f0hitageymir hennar metinn. Ranns\u00f3knin er \u00ed tveimur hlutum. \u00cd fyrri hlutanum er fjalla\u00f0 um goss\u00f6guna, kviku\u00fer\u00f3un og eiginleika kvikugeymisins. Seinni hlutinn fjallar um mat \u00e1 jar\u00f0hitageyminum. Sett er fram endursko\u00f0u\u00f0 jar\u00f0lagaskipan \u00ed Paka \u00fear sem greindar eru fimm gossyrpur sem spanna t\u00edmabili\u00f0 \u00a0fr\u00e1 um 582 til 8 ka. Paka-eldkeilan \u00f3x \u00ed fj\u00f3rum megin gossyrpum sem byrju\u00f0u fyrir 390 ka en \u00f6skjusig var\u00f0 fyrir um 36 ka. Me\u00f0al gosmyndana \u00e1 sv\u00e6\u00f0inu eru alkal\u00edbasalt- til trak\u00fdthraun og gj\u00f3skul\u00f6g. \u00c1\u00e6tla\u00f0 l\u00e1gmarks-r\u00famm\u00e1l gosefna er um 50 km3. \u00dea\u00f0 \u00fe\u00fd\u00f0ir a\u00f0 kvikuframlei\u00f0sla er 1,2 x10-4\u00a0km3\/\u00e1ri, sem gefur til kynna a\u00f0 VEI s\u00e9 \u00e1 bilinu 1-2 og varmastreymi af v\u00f6ldum innskota \u00e1 bilinu 110-138 mW\/m2. Reiknil\u00edkan sem byggir \u00e1 magni La og Y bendir til a\u00f0 frumkvika Paka hafi myndast vi\u00f0 5-10% hlutbr\u00e1\u00f0nun \u00e1 granatperid\u00f3t\u00edtm\u00f6ttulefni (\u00e1 60-80 km d\u00fdpi). Gert er r\u00e1\u00f0 fyrir \u00fer\u00f3unarferli kviku sem felur \u00ed s\u00e9r yfir 70% hlutkrist\u00f6llun og 10-20% meltingu \u00e1 syen\u00edti \u00ed mi\u00f0- til grunnskorpunni til a\u00f0 mynda trak\u00fdti\u00f0 \u00ed Paka. Bergfr\u00e6\u00f0ilegir hita- og \u00fer\u00fdstingsm\u00e6lar benda til kvikugeyma me\u00f0 samsetningu basalts og \u00eds\u00fars bergs sem sta\u00f0settir eru v\u00ed\u00f0a \u00e1 5-20 km og 15-20 km d\u00fdpi. \u00c1\u00e6tla\u00f0 er a\u00f0 grunnst\u00e6\u00f0ur trak\u00fdtkvikugeymir s\u00e9 \u00e1 3,7-5 km d\u00fdpi. Mat \u00e1 \u00feessari fj\u00f6lbreyttu bergsyrpu \u00ed t\u00edmans r\u00e1s s\u00fdnir a\u00f0 \u00e6tla\u00f0ir basalt- og trak\u00fdtgeymar \u00ed dj\u00fap-, mi\u00f0- og grunnskorpunni hafa veri\u00f0 langl\u00edfir og ekki breyst verulega fr\u00e1 \u00fev\u00ed fyrir um 580 ka. \u00c1\u00e6tla\u00f0 hitastig geyma me\u00f0 basaltkviku og \u00eds\u00farri kviku er \u00e1 bilinu 1032-1206 \u00b0C, en me\u00f0 trak\u00fdtkviku \u00e1 bilinu 900-938 \u00b0C vi\u00f0 tilt\u00f6lulega oxa\u00f0ar a\u00f0st\u00e6\u00f0ur (\u2206FMQ +1). \u00a0Ummerki jar\u00f0hitageymisins undir Paka-eldst\u00f6\u00f0inni eru \u00e1 yfirbor\u00f0i sem gufuhverir, jar\u00f0hitaummyndun og kulna\u00f0ir hverir. \u00cdtarleg greining \u00e1 borholug\u00f6gnum fr\u00e1 PK-01 bendir til a\u00f0 jar\u00f0hitakerfi\u00f0 einkennist af \u00feremur ummyndunarbeltum, \u00fe.e. smekt\u00edt-morden\u00edt-, kl\u00f3r\u00edt-ill\u00edt- og epid\u00f3t-akt\u00edn\u00f3l\u00edtbelti. V\u00edsbendingar eru einnig um a\u00f0 \u00e1berandi hitasveiflur hafi or\u00f0i\u00f0 \u00ed jar\u00f0hitakerfinu, \u00e1 bilinu 245-280 \u00b0C. Kerfi\u00f0 er vatnsr\u00edkt me\u00f0 su\u00f0usv\u00e6\u00f0i \u00e1 um 900 m d\u00fdpi. V\u00f6kvinn er af b\u00edkarb\u00f3natger\u00f0 og hefur veri\u00f0 svo me\u00f0an kerfi\u00f0 hefur veri\u00f0 virkt.<\/p>\n<p><strong>Um doktorsefni\u00f0:<\/strong><\/p>\n<p>Geoffrey Kiptoo Mibei er jar\u00f0fr\u00e6\u00f0ingur og hefur starfa\u00f0 hj\u00e1 jar\u00f0hita\u00fer\u00f3unarfyrirt\u00e6ki Ken\u00eda (GDC) s\u00ed\u00f0an 2010. Hann f\u00e6ddist \u00ed Nakuru \u00ed Ken\u00fda \u00e1ri\u00f0 1984. Hann brautskr\u00e1\u00f0ist fr\u00e1 \u00a0h\u00e1sk\u00f3lanum \u00ed Na\u00edr\u00f3b\u00ed me\u00f0 BS gr\u00e1\u00f0u \u00ed jar\u00f0fr\u00e6\u00f0i \u00e1ri\u00f0 2008. \u00c1ri\u00f0 2012 lauk hann meistaragr\u00e1\u00f0u \u00ed jar\u00f0efnafr\u00e6\u00f0i vi\u00f0 s\u00f6mu stofnun. \u00cd september 2017 h\u00f3f hann doktorsn\u00e1m \u00ed jar\u00f0fr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00ed gegnum Jar\u00f0hitask\u00f3la Sameinu\u00f0u \u00fej\u00f3\u00f0anna. Geoffrey er giftur Elizabeth og saman eiga \u00feau tv\u00f6 b\u00f6rn, d\u00f3tturina Precious Kiptoo og soninn Ryan Too.<\/p>\n<\/div><\/div>","protected":false},"featured_media":4974,"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":"2021-10-28T15:00:00+00:00","_phd_date_end":"2021-10-28T18:00:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0arsalur","_phd_admission":"Fer fram \u00e1 ensku \u00d6ll velkomin","_phd_thesis_title":"Gossaga, \u00fer\u00f3un kviku og mat \u00e1 jar\u00f0hita \u00ed eldst\u00f6\u00f0varkerfinu Paka \u00ed nor\u00f0urhluta sigdals Ken\u00eda","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_jardfraedi_geoffrey_kiptoo_mibei","_phd_source_node_id":"379449","_phd_source_type":"vidburdir","_phd_member_id":733,"footnotes":""},"phd_school":[113,93],"phd_discipline":[115],"class_list":["post-6210","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\/6210","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\/6210\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/4974"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6210"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6210"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6210"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}