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<p class="MsoNormal">Dear Colleagues,</p>
<p class="MsoNormal"><br>
</p>
<p class="MsoNormal"> A 1-day Zoom mini-workshop on pressure
seafloor geodesy will be held on March 15<sup>th</sup>, 2022.
This mini-workshop will bring together a group of geophysicists
and physical oceanographers to discuss the challenges and
opportunities of pressure seafloor geodesy and continental
margin circulations.<span style="mso-spacerun:yes"> </span>It
will also explore potential synergies and start the process of
developing plans for closer collaboration between the two
communities. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Please register here as soon as possible but
no later than February 4<sup>th</sup>, 2022: <a
href="https://forms.gle/2cKPnEpjB6QorCwB8"
class="moz-txt-link-freetext" moz-do-not-send="true">https://forms.gle/2cKPnEpjB6QorCwB8</a></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">This mini-workshop will be held tentatively
between 8 AM – 4 PM (Hawaii Time) on March 15<sup>th</sup>,
2022. You may choose to attend only part of it due to time
difference and other commitments. There is a question about this
in the registration. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Please note that there is a session on March
4<sup>th</sup>, 2022 in the Ocean Sciences Meeting, <i>OT18
Seafloor geodesy: An oceanographic perspective</i>, that
overlaps the content of our workshop.<span
style="mso-spacerun:yes"> </span>You will be required to
register the meeting to join that session. However, our 1-day
ZOOM mini-workshop will be free of charge and open to all.
During the ZOOM mini-workshop, we will provide short highlights
of the ocean sciences session. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><b>Motivation</b></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">On land, dense networks of GNSS receivers and
frequent InSAR observations have transformed our understanding
of the deformation associated with plate boundaries and
volcanoes. In the oceans, geodesy is more challenging, but is
critical for addressing many important problems, including
understanding the patterns of coupling and strain release on
megathrust faults in subduction zones. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">A fundamental challenge of pressure seafloor
geodesy is discriminating geodetic signals from those associated
with oceanography. Tides can be easily filtered but the seafloor
pressure signals related to other oceanographic processes can
swamp those from slow-slip events and are hard to remove. At
present, the two most common approaches to removing
oceanographic signals are (1) the use of a reference station
under the assumption that oceanography is spatially invariant on
the scales of interest and (2) the use of the pressure
predictions from global or regional circulation models that have
been developed by physical oceanographers primarily to study
circulation patterns in the upper ocean. Neither of these
approaches fully remove oceanographic signals and as a result
the detection threshold of pressure geodesy is quite high and
there can be ambiguity in the details of the events that are
detected.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">On one hand, improved corrections require a
better understanding of the physical oceanographic processes
that affect seafloor pressure and ultimately the development of
better models. On the other hand, data collected by
geophysicists for seafloor geodesy can be used to constrain the
models that physical oceanographers have developed. There are
clearly opportunities for synergistic interactions between
geophysicists and physical oceanographers. However, such
synergies have not been explored very extensively, and there is
quite limited involvement of physical oceanographers in seafloor
geodesy. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><b>Expected outcomes</b></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">A short report will be produced based on the
discussions during the mini-workshop. The report will outline
the challenges, list specific approaches to improving pressure
geodesy through enhanced collaborations, and make
recommendations for future interactions. Depending on the
discussions during this mini-workshop, an in-person workshop
might be held later in 2022 or early 2023.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><b>Confirmed participants</b></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Because prior discussions have been mostly
within the marine geophysical community, we have confirmed the
participation of the following physical oceanographers in order
to ensure a quorum from that community:</p>
<p class="MsoListParagraphCxSpFirst"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span style="font:7.0pt "Times
New Roman""> </span></span></span>Alan
Wallcraft (Florida State University)</p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span style="font:7.0pt "Times
New Roman""> </span></span></span>Bruce
Cornuelle (Scripps Institution of Oceanography)</p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span style="font:7.0pt "Times
New Roman""> </span></span></span>Chris Hughes
(University of Liverpool)</p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span style="font:7.0pt "Times
New Roman""> </span></span></span>Daisuke Inazu
(Tokyo University of Marine Science and Technology)</p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span style="font:7.0pt "Times
New Roman""> </span></span></span>Kenneth Brink
(Woods Hole Oceanographic Institute)</p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span style="font:7.0pt "Times
New Roman""> </span></span></span>Parker
McCready (University of Washington)</p>
<p class="MsoListParagraphCxSpLast"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span style="font:7.0pt "Times
New Roman""> </span></span></span>Randy Watts
(University of Rhode Island)</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Our hope is that this mini-workshop will
attract the participation of a diverse group of scientists, and
we particularly encourage early career participants. Please
share this announcement widely with colleagues who you think
might be interested.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">This mini-workshop follows on from some
discussions at last April’s <i>Future Directions in Seafloor
Geodesy Community Workshop</i>, which was attended primarily
by the marine geophysics community. The workshop report can be
found here <span style="mso-spacerun:yes"> </span><a
href="https://sites.google.com/view/seafloor-geodesy-community/virtual-workshop"
class="moz-txt-link-freetext" moz-do-not-send="true">https://sites.google.com/view/seafloor-geodesy-community/virtual-workshop</a>.</p>
<p class="MsoNormal"><br>
</p>
<p class="MsoNormal"><b>Organizers</b></p>
<p class="MsoListParagraphCxSpFirst"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span style="font:7.0pt "Times
New Roman""> </span></span></span>Matt Wei
(University of Rhode Island)</p>
<p class="MsoListParagraphCxSpLast"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span style="font:7.0pt "Times
New Roman""> </span></span></span>William
Wilcock (University of Washington)</p>
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<pre class="moz-signature" cols="72">Meng "Matt" Wei
Associate Professor
Graduate School of Oceanography
University of Rhode Island
Tel: (401)874-6530 | <a class="moz-txt-link-freetext" href="https://weilaburi.wixsite.com/home" moz-do-not-send="true">https://weilaburi.wixsite.com/home</a></pre>
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