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Dear colleagues and students,<br>
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<blockquote style="margin-left:0in; margin-bottom:0in">Please join us this Friday as CTFM welcomes Prof. Helge Gonnermann from the nearby university of Rice.<br>
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<p><b>" From birth to death - bubbles during volcanic eruptions</b> <b>"</b><b><br>
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<p><b>Helge Gonnermann</b><br>
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<div class="moz-forward-container">Associate Professor, Department of Earth Science, Rice University<br>
<blockquote style="margin-left:0in; margin-bottom:0in"><b>Date</b>: Friday, October 11th, 2019</blockquote>
<blockquote style="margin-left:0in; margin-bottom:0in"><b>Time</b>: 1:00-2:00 PM</blockquote>
<blockquote style="margin-left:0in"><b>L</b><b>ocation</b>: Room 102D in Engineering Building 1<br>
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<p lang="en-US" align="left" style="margin-bottom:0cm; border:none; padding:0cm; font-variant:normal; letter-spacing:normal; font-style:normal; font-weight:normal; line-height:0.71cm; text-decoration:none">
<b>Abstract: </b><font color="#000000"><font face="Helvetica Neue, serif"><font size="2" style="font-size:11pt"><font face="Arial,
serif"><font size="3" style="font-size:12pt"><span lang="en-US">Volcanic eruptions are driven by abundant
magmatic volatiles, such as water, that become supersaturated in the magma and nucleate a myriad of bubbles upon ascent to the surface. Bubbles in the erupted magmas also provide records of subsurface conditions that are inaccessible to direct observations
during volcanic eruptions. I will provide an overview of the role of bubbles during volcanic eruptions of silica rich magmas. These are magmas with viscosities that range from ~10</span></font></font><sup><font face="Arial, serif"><font size="3" style="font-size:12pt"><span lang="en-US">4</span></font></font></sup><font face="Arial, serif"><font size="3" style="font-size:12pt"><span lang="en-US">
Pa.s at depth to >10</span></font></font><sup><font face="Arial, serif"><font size="3" style="font-size:12pt"><span lang="en-US">8</span></font></font></sup><font face="Arial, serif"><font size="3" style="font-size:12pt"><span lang="en-US"> Pa.s near the surface
and which produce eruptions that range from the most explosive eruptions on Earth to continuous lava effusion over periods of months or years. I will discuss the roles and unsolved problems associated with the 'birth' and 'death' of bubbles. The former is
bubble nucleation, whereas the latter encompasses bubble coalescence and the loss of volatiles by permeable flow, as well as magma fragmentation during explosive eruptions.</span></font></font></font></font></font></p>
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