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<div style=""><span style="font-size:14pt"><b>Distributed Acoustic Sensing for Infrastructure and Geohazards</b></span><br>
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<div style=""><span style="font-size:11pt"><b></b></span><span style="font-size:14pt"><b><br>
</b></span></div>
<div style=""><span style="font-size:12pt"><b>Speaker: </b></span><span style="font-size:12pt">Eileen Martin</span></div>
<div style=""><span style="font-size:12pt"> Colorado School of Mines</span></div>
<div style=""><span style="font-size:12pt"><b>Location: </b>online/virtual only</span></div>
<div style=""><span style="font-size:12pt"><b>Date/Time: </b>Tuesday, Oct 25, 2022 10-11am MDT</span></div>
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</span></div>
<div style=""><span style="font-size:12pt"><b>Abstract:</b></span><span style="font-size:12pt"><b> </b></span><span style="font-size:12pt"><b><span class="x_ContentPasted0" style="font-weight:400; font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif; margin:0px; color:black; background-color:rgb(255,255,255)">Fiber
optic distributed acoustic sensing (DAS) allows us to convert a standard fiber optic cable into a dense array of strain sensors over long distances. We have developed new scalable techniques for using existing dark fiber infrastructure readily available in
many earthquake-prone regions, installing fiber in less-invasive ways along infrastructure supported by permafrost, and installing fiber throughout underground mine environments where seismicity monitoring could improve worker safety outcomes. </span>
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<span style="font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif">While fiber optic sensing has enabled easier seismic data acquisition, this has also led to much larger data volumes than these applications have
ever previously used. For DAS to be adopted for these applications at any meaningful scale, we require: (i) fast turnaround times from data acquisition to discovery/decisions, (ii) analysis methods that only require a small amount of computational hardware,
and (iii) reliable reproducible workflows.</span></div>
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<span style="font-weight:400; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; margin:0px; color:black; background-color:rgb(255,255,255)"><span class="x_ContentPasted0" style="margin:0px; font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif">Thus,
we have pursued a holistic approach to DAS data acquisition, analysis software, and data sharing. W</span><span class="x_ContentPasted0" style="margin:0px"><span class="x_ContentPasted0" style="margin:0px; background-color:white; font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif">e
have released software for real-time initial DAS data analysis in the field, </span><span class="x_ContentPasted0" style="margin:0px; background-color:white"><span class="x_ContentPasted0" style="margin:0px; background-color:white; font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif">we
are growing the DAS Data Analysis Ecosystem of open-source Python software tools, we have created new algorithms that greatly reduce hardware and time requirements, and w</span></span></span><span class="x_ContentPasted0" style="margin:0px; font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif">e
recently released the PubDAS public DAS data archive.</span></span></b></span></div>
<div style=""><span style="font-size:12pt"><b><span style="font-weight:400; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; margin:0px; color:black; background-color:rgb(255,255,255)"><span class="x_ContentPasted0" style="margin:0px; font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif"><br>
</span></span></b></span></div>
<div style=""><span style="font-size:12pt"><span style="font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; margin:0px; color:black; background-color:rgb(255,255,255)"><span class="x_ContentPasted0 x_ContentPasted1" style="margin:0px; font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif"><b>Bio: </b>Eileen
Martin is an assistant professor at Colorado School of Mines jointly appointed in geophysics and applied math and statistics, and is affiliated with the hydrologic science and engineering program. She holds a PhD in computational and mathematical engineering,
an MS in geophysics, and BS degrees in mathematics and computational physics. </span>
</span></span></div>
<div style=""><span style="font-size:12pt"><span style="font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; margin:0px; color:black; background-color:rgb(255,255,255)"><span class="x_ContentPasted0 x_ContentPasted1" style="margin:0px; font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif"><br>
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<div style=""><span style="font-size:12pt"><span style="font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; margin:0px; color:black; background-color:rgb(255,255,255)"><span class="x_ContentPasted0 x_ContentPasted1" style="margin:0px; font-size:12pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif"><img data-imagetype="AttachmentByCid" explicitlogon="gs-ghsc-seminars@doimspp.onmicrosoft.com" data-custom="AAMkADUyYjhhNDdjLTM2ZjItNDU1YS04MzJiLTZiMzk5YzA1ZWQ3ZAFRAAgI2rYb3CMAAEYAAAAA%2BtEuMRRToUiWJiHM%2BXZQbAcA%2BNwATNGyGUiyQJkf%2FkWmOgAAAAABDQAA%2BNwATNGyGUiyQJkf%2FkWmOgACjvVf4QAAEAESABAANlo4JjgesEKL0VNG6vQ4%2Fg%3D%3D" naturalheight="0" naturalwidth="0" class="x_ContentPasted2 x_w-865 x_h-664" width="603" height="463" size="756485" style="width:603.155px; height:463px; max-width:initial" src="cid:cfc1cc63-df9d-4401-92d5-89cf7fca098e"><br>
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<div style=""><span style="font-size:12pt"><span style="font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; margin:0px; color:black; background-color:rgb(255,255,255)"><span class="x_ContentPasted0 x_ContentPasted1" style="margin:0px; font-size:11pt; font-family:"Segoe UI","Segoe UI Web (West European)","Helvetica Neue",sans-serif; color:rgb(102,102,102)">Installation
of fiber optic DAS and DTS cables in Utqiagvik, AK</span></span></span></div>
<div style=""><span style="font-size:12pt"><b><span style="font-weight:400; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; margin:0px; color:black; background-color:rgb(255,255,255)"><span class="x_ContentPasted0" style="margin:0px"><br>
</span></span></b></span></div>
<div style=""><font color="#201f1e" face="Calibri, sans-serif"><span style="font-size:12pt; color:rgb(102,102,102)">For questions, comments, or speaker suggestions, please contact the </span></font><b style="color:inherit; font-family:inherit; font-size:12pt; font-style:inherit; font-variant-ligatures:inherit; font-variant-caps:inherit"><span style="font-weight:400"><span style="font-size:12pt; font-family:Calibri,sans-serif; color:rgb(102,102,102)">GHSC
Seminar Committee: Andrea Llenos <allenos@usgs.gov>, Benjamin Murphy <bmurphy@usgs.gov>, Lauren Schaefer <lschaefer@usgs.gov></span></span></b></div>
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