<div dir="ltr"><br clear="all"><div class="gmail_quote"><p style="text-align:center;clear:both"><img src="cid:ca76d7fa-e4e8-4180-9bb9-c921a492d213" alt="SDSU_CSRC Logo.jpg" style="margin-left:1em;margin-right:1em"></p><p class="MsoNormal" align="center" style="line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"><br></span></p><p class="MsoNormal" align="center" style="line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"><br></span></p><p class="MsoNormal" align="center" style="line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"><br></span></p><p class="MsoNormal" align="center" style="line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"><br></span></p><p class="MsoNormal" align="center" style="line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"><br></span></p><p class="MsoNormal" align="center" style="line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black">DATE:</span><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"> </span><span style="font-size:13.5pt;font-family:Verdana,sans-serif;color:black"> </span><b><span style="font-size:18pt;font-family:Verdana,sans-serif">Friday, April 17, 2020</span></b></p><p class="MsoNormal" align="center" style="line-height:normal;text-align:center"><b><span style="font-size:18pt;font-family:Verdana,sans-serif"><br></span></b></p><p class="MsoNormal" align="center" style="line-height:normal;text-align:center"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"></span></p><p class="MsoNormal" align="center" style="line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"><br></span></p><div dir="ltr"><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"></span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"></span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black">TITLE:</span><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"><br></span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"></span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><font size="6"><span style="font-family:verdana,sans-serif"></span></font></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><font size="6"><span style="font-family:verdana,sans-serif"><b><span style="background-image:none;background-position:0% 0%;background-repeat:repeat"></span></b></span></font></p><div style="text-align:center"><span style="color:rgb(0,0,0);text-align:left"><font face="verdana, sans-serif" size="6"><b>What is Bayesian inference, why is it useful in Earth science and why is it challenging to do numerically?</b></font></span><br></div><div style="text-align:center"><span style="font-family:verdana,sans-serif"><font size="6"><b><br></b></font></span><span style="font-family:verdana,sans-serif"><font size="6"><b></b></font></span><p class="MsoNormal" style="margin-top:1em;margin-bottom:1em;line-height:normal"><b><span style="font-size:11pt;font-family:Arial,sans-serif;color:black"></span></b></p><span style="font-family:verdana,sans-serif"><font size="6"><b></b></font></span><span style="font-family:verdana,sans-serif"><font size="6"><b><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></b></font></span><span style="font-family:verdana,sans-serif"><font size="6"><b></b></font></span><span style="font-family:verdana,sans-serif"><font size="6"><b><span style="font-size:11pt"></span></b></font></span></div><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"></span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"></span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"><br></span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black">TIME:</span><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"> </span><span style="font-size:13.5pt;font-family:Verdana,sans-serif;color:black"> </span><b><span style="font-size:18pt;font-family:Verdana,sans-serif">3:00-4:00PM</span></b></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><br><b><span style="font-size:18pt;font-family:Verdana,sans-serif"><span style="color:black"></span></span></b></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"> </span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black">LOCATION:<br></span><b><font face="verdana, sans-serif" size="4"><span style="color:black">Join Zoom Meeting - </span><font color="#000000"><a href="https://SDSU.zoom.us/j/99859040967" target="_blank">https://SDSU.zoom.us/j/99859040967</a> </font></font><span style="font-size:18pt;font-family:Verdana,sans-serif"><br></span></b></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><b><span style="font-size:18pt;font-family:Verdana,sans-serif"><br></span></b></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"> </span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"></span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black">SPEAKER/BIO:</span><span style="font-size:13.5pt;font-family:Verdana,sans-serif;color:black"> </span><b><span style="font-size:18pt;font-family:Verdana,sans-serif"><br></span></b></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><br><b><span style="font-size:18pt;font-family:Verdana,sans-serif"></span></b></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><b><font size="4"><span style="color:rgb(0,0,0);text-align:left"><font face="verdana, sans-serif">Dr. </font></span></font></b><span style="color:rgb(0,0,0)"><font face="verdana, sans-serif" size="4"><b>Matthias Morzfeld, Associate Professor, Institute of Geophysics and Planetary Physics, University of CA, San Diego</b></font></span></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><font size="4"><span style="font-family:verdana,sans-serif"><b><b><span style="font-size:18pt;font-family:Verdana,sans-serif"><span style="color:black"></span></span></b></b></span></font></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><b><span style="font-size:18pt;font-family:Verdana,sans-serif"></span></b></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;text-align:center"><span style="font-family:Verdana,sans-serif;color:black"> </span></p><p class="MsoNormal" style="margin-top:1em;margin-bottom:1em;line-height:normal"><font size="2"><span style="font-family:Verdana,sans-serif;color:black"><br></span></font></p><p class="MsoNormal" style="margin-top:1em;margin-bottom:1em;line-height:normal"><font size="2"><span style="font-family:Verdana,sans-serif;color:black"><br></span></font></p><p class="MsoNormal" style="margin-top:1em;margin-bottom:1em;line-height:normal"><font size="4"><span style="font-family:Verdana,sans-serif;color:black">ABSTRACT:</span></font></p></div><div dir="ltr"><span style="color:rgb(0,0,0)"><font face="verdana, sans-serif" size="4">I will first review Bayesian inference, which means to incorporate information from observations (data) into a numerical model, and will give some examples of applications in Earth science. The numerical solution of Bayesian inference problems is often based on sampling a posterior probability distribution. Sampling posterior distributions is difficult because these are usually high-dimensional (many parameters or states to estimate) and non-standard (e.g., not Gaussian). In particular a high-dimension causes numerical difficulties and slow convergence in many sampling algorithms. I will explain how ideas from numerical weather prediction can be leveraged to design Markov chain Monte Carlo (MCMC) samplers whose convergence rates are independent of the problem dimension for a well-defined class of problems.</font></span><br></div><div dir="ltr"><font size="4"><span style="font-family:verdana,sans-serif"> <br></span></font></div><div dir="ltr"><font size="4"><span style="font-family:verdana,sans-serif"><br></span></font><p class="MsoNormal" style="margin:0in 5.2pt 0.0001pt 0in;line-height:13.91px"><br></p><span style="font-family:arial,sans-serif"><font size="4"></font></span></div><span style="font-family:arial,sans-serif"><font size="4">Host: Samuel Shen</font></span><br>
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