Prof. Sylvain Barbot
University of Southern California
[more info]

From Grains to Tectonic Plate Boundaries

The cold, brittle surface of our planet continuously shakes as the giant tectonic plates that glide above a hot mantle are thrusted along, away, or towards each other. Earthquakes are the trademark of plate tectonics and the cause of many terrible disasters. Yet, the underlying physics of this global phenomenon is not clearly defined. Using insights from mechanics and numerical simulations, I will describe how the deformation of grains at the micro-scale may dictate the dynamics of large lithospheric faults and the generation of a wide spectrum of rock failures, from slow to fast earthquakes, with recurrence patterns going from repetitive to chaotic.

University of Louisiana, Lafayette ♦ Louisiana State University


Prof. Sarah Stamps
Virginia Tech
[more info]

Clues About the Break-up of the African Continent 

The African continent is slowly fragmenting into 5 small pieces along the East African Rift System (EARS) across east Africa. What drives this process and how exactly are these pieces of Earth's crust moving? In this seminar I present data that shows how the tectonic plates of the EARS are slowly moving and deforming causing hazardous seismic and volcanic activity.  Using modern-day, high precision positioning measurements from Global Navigation Satellite Systems (GNSS) and advanced numerical modeling, we model the physics driving surface motions to understand the driving forces causing the break-up of Africa. We find that deformation is characterized by east-west extension and the major forces driving surface motions are derived from topography gradients. Deeper processes are responsible for the distribution melt beneath magma-poor rifts.

Grand Valley State University ♦ Michigan State University ♦ University of Alaska, Fairbanks

[ADD IMAGE] Prof. Jolante Van Wijk
New Mexico Institute of Mining and Technology
[more info]

What Creates the Unique Topography of East Africa?

The elevation of East Africa is unusually high, commonly >3000 m above sea level. The elevation of a continent above sea level is generally related to the thick, low-density crust of the continents, plus contributions from tectonic events. In East Africa however, these two factors together cannot explain its high elevation. It has been suggested that a third component, called dynamic topography, may contribute to the high elevation in East Africa. Dynamic topography is caused by flow in Earth’s mantle.  

In this seminar, I will discuss dynamic topography, how theoretical models predict that it exists, and how we can quantify it. I will show how submarine unconformities can be used to quantify dynamic topography in oceanic basins.  

Montana Tech ♦ University of Montana ♦ Florida State University

Debug Console

Close19 MBRequestSessionTimelineDatabase39Events25
Array( ) Array(

Array( ) Array(

Array( ) Array(

Array( PATH => /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin, USER => apache, HOME => /... Array(
PATH => /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin,
USER => apache,
HOME => /var/www,
REDIRECT_SCRIPT_URL => /outreach/speaker/speaker-2019,
REDIRECT_SCRIPT_URI => https://geodynamics.hubzero.org/outreach/speaker/speaker-2019,
REDIRECT_SSL_TLS_SNI => geodynamics.hubzero.org,
SCRIPT_URL => /outreach/speaker/speaker-2019,
SCRIPT_URI => https://geodynamics.hubzero.org/outreach/speaker/speaker-2019,
HTTPS => on,
SSL_TLS_SNI => geodynamics.hubzero.org,
HTTP_USER_AGENT => CCBot/2.0 (https://commoncrawl.org/faq/),
HTTP_ACCEPT => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8,
HTTP_HOST => geodynamics.hubzero.org,
SERVER_NAME => geodynamics.hubzero.org,
DOCUMENT_ROOT => /var/www/geodynamics,
CONTEXT_DOCUMENT_ROOT => /var/www/geodynamics,
SERVER_ADMIN => root@localhost,
SCRIPT_FILENAME => /var/www/geodynamics/index.php,
REMOTE_PORT => 49532,
REDIRECT_URL => /outreach/speaker/speaker-2019,
REQUEST_URI => /outreach/speaker/speaker-2019,
SCRIPT_NAME => /index.php,
PHP_SELF => /index.php,
REQUEST_TIME_FLOAT => 1623602281.2241,
REQUEST_TIME => 1623602281
separator .
orderBy id
orderDir asc
1 registerIP
2 access
tracker.sid a0fddb829157216ea9996cb3d805aeb2
tracker.ssid a0fddb829157216ea9996cb3d805aeb2
tracker.rsid a0fddb829157216ea9996cb3d805aeb2
  • site 0.050 seconds (+0.050); 12.25 MB (+12.250) - afterInitialise
  • site 0.086 seconds (+0.036); 15.00 MB (+2.750) - afterRoute
  • site 0.125 seconds (+0.039); 18.00 MB (+3.000) - afterDispatch
  • site 0.132 seconds (+0.007); 18.25 MB (+0.250) - beforeRenderModule mod_search (Search)
  • site 0.134 seconds (+0.002); 18.25 MB (0.000) - afterRenderModule mod_search (Search)
  • site 0.134 seconds (+0.000); 18.25 MB (0.000) - beforeRenderModule mod_menu (Main Menu)
  • site 0.200 seconds (+0.066); 19.00 MB (+0.750) - afterRenderModule mod_menu (Main Menu)
  • site 0.202 seconds (+0.002); 19.00 MB (0.000) - onAfterRender
  • site 0.204 seconds (+0.002); 19.00 MB (0.000) - sessionStore
19 MB

39 Queries Logged: 0.011237382888794 seconds

  1. SELECT data
      FROM `jos_session`
      WHERE `session_id` = 'eb9c762ea43555ed39c63c5b534fdac4'
      FROM `jos_session`
      WHERE `session_id` = 'eb9c762ea43555ed39c63c5b534fdac4'
  3. SELECT data
      FROM `jos_session`
      WHERE `session_id` = 'a0fddb829157216ea9996cb3d805aeb2'
  4. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_languages'
  5. SELECT session_id
      FROM `jos_session`
      WHERE `session_id` = 'a0fddb829157216ea9996cb3d805aeb2'
      LIMIT 1
  6. INSERT INTO `jos_session` (`session_id`,`client_id`,`time`,`ip`)
      VALUES ('a0fddb829157216ea9996cb3d805aeb2','0','1623602281','')
  7. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_members'
  8. SELECT b.id
      FROM `jos_usergroups` AS `a`
      LEFT JOIN jos_usergroups AS b
      ON b.lft <= a.lft
      AND b.rgt >= a.rgt
      WHERE `a`.`id` = '1'
  9. SELECT *
      FROM `jos_viewlevels`
  10. SELECT folder AS type,element AS name,protected,params
      FROM `jos_extensions`
      WHERE `enabled` >= '1'
      AND `type` = 'plugin'
      AND `state` >= '0'
      AND `access` IN ('1','1','4')
      ORDER BY `ordering` ASC
  11. SELECT m.id,m.menutype,m.title,m.alias,m.note,m.path AS route,m.link,m.type,m.level,m.language,m.browserNav,m.access,m.params,m.home,m.img,m.template_style_id,m.component_id,m.parent_id,e.element AS component
      FROM `jos_menu` AS `m`
      LEFT JOIN jos_extensions AS e
      ON e.extension_id = m.component_id
      WHERE `m`.`published` = '1'
      AND `m`.`parent_id` > '0'
      AND `m`.`client_id` = '0'
      ORDER BY `m`.`lft` ASC
  12. SELECT jos_template_styles.id,jos_template_styles.home,jos_template_styles.template,jos_template_styles.params,jos_extensions.protected
      FROM `jos_template_styles`
      INNER JOIN jos_extensions
      ON jos_extensions.element = jos_template_styles.template
      WHERE `jos_template_styles`.`client_id` = '0'
      AND `jos_extensions`.`enabled` = '1'
      AND `jos_extensions`.`type` = 'template'
      AND jos_extensions.`client_id` = `jos_template_styles`.`client_id`
      ORDER BY `home` DESC
  13. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_content'
  14. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_categories'
  15. SELECT a.rules
      FROM `jos_assets` AS `a`
      WHERE `a`.`id` = '1'
      GROUP BY a.id, a.rules, a.lft
  16. SELECT b.rules
      FROM `jos_assets` AS `a`
      LEFT JOIN jos_assets AS b
      ON b.lft <= a.lft
      AND b.rgt >= a.rgt
      WHERE `a`.`name` = 'com_content'
      GROUP BY b.id, b.rules, b.lft
      ORDER BY `b`.`lft` ASC
  17. SELECT a.*,a.id,a.asset_id,a.title,a.alias,a.title_alias,a.introtext,a.fulltext,
      CASE WHEN badcats.id IS NULL THEN a.state ELSE 0 END AS state,a.mask,a.catid,a.created,a.created_by,a.created_by_alias,
      CASE WHEN a.modified IS NULL THEN a.created ELSE a.modified END AS modified,a.modified_by,a.checked_out,a.checked_out_time,a.publish_up,a.publish_down,a.images,a.urls,a.attribs,a.version,a.parentid,a.ordering,a.metakey,a.metadesc,a.access,a.hits,a.metadata,a.featured,a.language,a.xreference,c.title AS category_title,c.alias AS category_alias,c.access AS category_access,u.name AS author,parent.title AS parent_title,parent.id AS parent_id,parent.path AS parent_route,parent.alias AS parent_alias,ROUND(v.rating_sum / v.rating_count, 0) AS rating,v.rating_count AS rating_count
      FROM `jos_content` AS `a`
      LEFT JOIN jos_categories AS c
      ON c.id = a.catid
      LEFT JOIN jos_users AS u
      ON u.id = a.created_by
      LEFT JOIN jos_categories as parent
      ON parent.id = c.parent_id
      LEFT JOIN jos_content_rating AS v
      ON a.id = v.content_id
      OUTER JOIN (SELECT cat.id as id
      FROM jos_categories AS cat JOIN jos_categories AS parent
      ON cat.lft BETWEEN parent.lft
      AND parent.rgt
      WHERE parent.extension = 'com_content'
      AND parent.published <= 0
      GROUP BY cat.id) AS badcats
      ON badcats.id = c.id
      WHERE `a`.`id` = '87'
      AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= '2021-06-13 16:38:01' )
      AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= '2021-06-13 16:38:01' )
      AND `a`.`state` IN ('1','2')
  18. SELECT c.*,
      CASE WHEN CHAR_LENGTH(c.alias) THEN CONCAT_WS(':', c.id, c.alias) ELSE c.id END as slug
      FROM `jos_categories` AS `c`
      LEFT JOIN jos_categories AS s
      ON (s.lft <= c.lft
      AND s.rgt >= c.rgt) OR (s.lft > c.lft
      AND s.rgt < c.rgt)
      LEFT JOIN (SELECT cat.id as id
      FROM jos_categories AS cat JOIN jos_categories AS parent
      ON cat.lft BETWEEN parent.lft
      AND parent.rgt
      WHERE parent.extension = 'com_content'
      AND parent.published != 1
      GROUP BY cat.id) AS badcats
      ON badcats.id = c.id
      WHERE (`c`.`extension` = 'com_content' OR `c`.`extension` = 'system' )
      AND `c`.`access` IN ('1','1','4')
      AND `c`.`published` = '1'
      AND `s`.`id` = '31'
      AND badcats.id is null
      GROUP BY c.id,c.asset_id,c.access,c.alias,c.checked_out,c.checked_out_time,c.created_time,c.created_user_id,c.description,c.extension,c.hits,c.language,c.level,c.lft,c.metadata,c.metadesc,c.metakey,c.modified_time,c.note,c.params,c.parent_id,c.path,c.published,c.rgt,c.title,c.modified_user_id
      ORDER BY `c`.`lft` ASC
  19. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_users'
  20. SELECT m.id,m.title,m.module,m.position,m.content,m.showtitle,m.params,mm.menuid,e.protected
      FROM `jos_modules` AS `m`
      LEFT JOIN jos_modules_menu AS mm
      ON mm.moduleid = m.id
      LEFT JOIN jos_extensions AS e
      ON e.element = m.module
      AND e.client_id = m.client_id
      WHERE `m`.`published` = '1'
      AND `e`.`enabled` = '1'
      AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= '2021-06-13 16:38:01' )
      AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= '2021-06-13 16:38:01' )
      AND `m`.`access` IN ('1','1','4')
      AND `m`.`client_id` = '0'
      AND (`mm`.`menuid` = '208' OR `mm`.`menuid` <= '0' )
      ORDER BY `m`.`position` ASC,`m`.`ordering` ASC
  21. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_search'
  22. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_events'
  23. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_newsletter'
  24. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_groups'
  25. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_projects'
  26. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_resources'
  27. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_courses'
  28. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_forum'
  29. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_collections'
  30. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_blog'
  31. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_tags'
  32. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_wiki'
  33. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_citations'
  34. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_storefront'
  35. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_answers'
  36. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_support'
  37. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_kb'
  38. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_wishlist'
  39. UPDATE `jos_session`
      SET `data` = '__default|a:9:{s:15:\"session.counter\";i:1;s:19:\"session.timer.start\";i:1623602281;s:18:\"session.timer.last\";i:1623602281;s:17:\"session.timer.now\";i:1623602281;s:8:\"registry\";O:23:\"Hubzero\\Config\\Registry\":2:{s:7:\"\0*\0data\";O:8:\"stdClass\":1:{s:1:\"0\";s:7:\"session\";}s:9:\"separator\";s:1:\".\";}s:4:\"user\";C:17:\"Hubzero\\User\\User\":22:{a:1:{s:5:\"guest\";b:1;}}s:11:\"tracker.sid\";s:32:\"a0fddb829157216ea9996cb3d805aeb2\";s:12:\"tracker.ssid\";s:32:\"a0fddb829157216ea9996cb3d805aeb2\";s:12:\"tracker.rsid\";s:32:\"a0fddb829157216ea9996cb3d805aeb2\";}',`time` = '1623602281',`ip` = ''
      WHERE `session_id` = 'a0fddb829157216ea9996cb3d805aeb2'
  • onAfterInitialise Method plgSystemP3p::onAfterInitialise /core/plugins/system/p3p/p3p.php:21
  • onAfterInitialise Method plgSystemRemember::onAfterInitialise /core/plugins/system/remember/remember.php:20
  • onAfterInitialise Method plgSystemHubzero::onAfterInitialise /core/plugins/system/hubzero/hubzero.php:21
  • onAfterInitialise Method plgSystemXFeed::onAfterInitialise /core/plugins/system/xfeed/xfeed.php:21
  • onAfterInitialise Method plgSystemSupergroup::onAfterInitialise /core/plugins/system/supergroup/supergroup.php:113
  • onAfterInitialise Method plgSystemReferrerpolicy::onAfterInitialise /core/plugins/system/referrerpolicy/referrerpolicy.php:21
  • onAfterRoute Method plgSystemJquery::onAfterRoute /core/plugins/system/jquery/jquery.php:21
  • onAfterRoute Method plgSystemSpamjail::onAfterRoute /core/plugins/system/spamjail/spamjail.php:21
  • onAfterRoute Method plgSystemIncomplete::onAfterRoute /core/plugins/system/incomplete/incomplete.php:21
  • onAfterRoute Method plgSystemUnconfirmed::onAfterRoute /core/plugins/system/unconfirmed/unconfirmed.php:21
  • onAfterRoute Method plgSystemUnapproved::onAfterRoute /core/plugins/system/unapproved/unapproved.php:21
  • onAfterRoute Method plgSystemPassword::onAfterRoute /core/plugins/system/password/password.php:21
  • onContentPrepare Method plgContentLoadmodule::onContentPrepare /core/plugins/content/loadmodule/loadmodule.php:35
  • onContentPrepare Method plgContentEmailcloak::onContentPrepare /core/plugins/content/emailcloak/emailcloak.php:25
  • onContentPrepare Method plgContentPagebreak::onContentPrepare /core/plugins/content/pagebreak/pagebreak.php:35
  • onContentPrepare Method plgContentXhubtags::onContentPrepare /core/plugins/content/xhubtags/xhubtags.php:25
  • onContentPrepare Method plgContentFormatwiki::onContentPrepare /core/plugins/content/formatwiki/formatwiki.php:63
  • onContentPrepare Method plgContentFormathtml::onContentPrepare /core/plugins/content/formathtml/formathtml.php:105
  • onContentPrepare Method plgContentExternalhref::onContentPrepare /core/plugins/content/externalhref/externalhref.php:41
  • onContentBeforeDisplay Method plgContentPagenavigation::onContentBeforeDisplay /core/plugins/content/pagenavigation/pagenavigation.php:25
  • onContentBeforeDisplay Method plgContentVote::onContentBeforeDisplay /core/plugins/content/vote/vote.php:32
  • onAfterDispatch Method plgSystemMobile::onAfterDispatch /core/plugins/system/mobile/mobile.php:22
  • onAfterDispatch Method plgSystemDebug::onAfterDispatch /core/plugins/system/debug/debug.php:60
  • onAfterDispatch Method PlgSystemHighlight::onAfterDispatch /core/plugins/system/highlight/highlight.php:25
  • onAfterRender Method plgSystemSef::onAfterRender /core/plugins/system/sef/sef.php:21