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<p class="MsoNormal"><span style="color:black">Hi all,<o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
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<span style="color:black">On Wed. our very own Thomas Rapstine (recent PhD graduate from CSM) will be presenting some interesting work from his dissertation, primarily focused on tracking landslide and debris-flow movement at the USGS debris-flow flume.<o:p></o:p></span></p>
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<span style="color:black">See info below<o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
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<b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86;border:none windowtext 1.0pt;padding:0in">Francis Kevin Rengers, Ph.D. | Geomorphologist </span></b><span style="color:black"><o:p></o:p></span></p>
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<b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86">U.S. Geological Survey | Research Geologist </span></b><span style="color:black"><o:p></o:p></span></p>
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<b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86">1711 Illinois St. Golden, CO 80401 </span></b><span style="color:black"><o:p></o:p></span></p>
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<b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86">office: 303-273-8637 | cell: 720-618-0351</span></b><span style="color:black"><o:p></o:p></span></p>
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<b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86"><a href="https://www.usgs.gov/staff-profiles/francis-rengers"><span style="color:#0563C1">https://www.usgs.gov/staff-profiles/francis-rengers</span></a></span></b><span style="color:black"><o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="color:black">From:<span class="apple-converted-space"> </span></span></b><span style="color:black">"Thomas, Matthew A" <<a href="mailto:matthewthomas@usgs.gov">matthewthomas@usgs.gov</a>><br>
<b>Date:<span class="apple-converted-space"> </span></b>Monday, July 13, 2020 at 8:20 AM<br>
<b>To:<span class="apple-converted-space"> </span></b>LHP Seminar <<a href="mailto:landslidegroupmeeting@doimspp.onmicrosoft.com">landslidegroupmeeting@doimspp.onmicrosoft.com</a>><br>
<b>Subject:<span class="apple-converted-space"> </span></b>Joint LHP & GHSC Seminar, this Wed. (July 15th): Thomas Rapstine presenting "Towards Airborne Measurements of Ground Displacement"<o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:black">Hi Folks,</span><span style="font-family:"-webkit-standard",serif;color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:black"> </span><span style="font-family:"-webkit-standard",serif;color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:black;background:white">The <b>LHP Seminar</b> will meet (virtually, via Microsoft Teams) this week on<b> Wednesday, July 15th @ 1500</b> <b>Mountain </b>time.</span><span style="font-family:"-webkit-standard",serif;color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:black"> </span><span style="font-family:"-webkit-standard",serif;color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:black">Our very own<span class="apple-converted-space"> </span></span><b><span style="font-size:11.5pt;font-family:"-webkit-standard",serif;color:black"><a href="https://www.linkedin.com/in/thomas-rapstine-b6b45849/" title="https://www.linkedin.com/in/thomas-rapstine-b6b45849/"><span style="font-size:12.0pt">Thomas
Rapstine</span></a></span></b><span class="apple-converted-space"><b><span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:black"> </span></b></span><span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:black">will be
presenting, "Towards Airborne Measurements of Ground Displacement"</span><span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:#212121;background:white">:</span><span style="font-family:"-webkit-standard",serif;color:black"><o:p></o:p></span></p>
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<span style="font-size:11.5pt;font-family:"-webkit-standard",serif;color:#201F1E"> </span><span style="font-family:"-webkit-standard",serif;color:black"><o:p></o:p></span></p>
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<span style="color:black;background:white">Valuable resources and risk assessments are realized by mapping variations of the physical composition and structure at the surface and in the subsurface of the Earth. A key measurement for realizing these benefits
is measuring ground displacement as a function of time, which enable geophysicists to conduct seismic studies for inferring subsurface structure and composition, and enable geomorphologists to study and monitor landslides. It is difficult to measure ground
displacement due to seismic waves or landslide failure since such phenomena evolve rapidly and exhibit large dynamic ranges. In addition, logistic, environmental, and safety concerns limit when and where seismic or landslide measurements can occur. These
issues motivate the need for rapid, accurate, remote, and possibly airborne measurements of displacement time series. Simultaneously addressing all of these issues is challenging since conventional sensors capable of accurately measuring ground displacement,
such as a geophones, require physical coupling to the ground and only measure displacement at one location. However, advancements in the field of computer vision, together with rapid development of drone and camera hardware, provide a foundation for rapid
and accurate airborne displacement measurements, thus aiding geophysicists and geomorphologists in their respective studies. In this thesis, I describe multiple theoretical advances that enable remote video-based measurements of subtle rapidly varying ground
displacement for applications in geophysics and geomorphology. Based on the methods and applications discovered in this thesis, I draw four main conclusions. (1) Earthquake signals can theoretically be measured using drone-borne stereo cameras, provided that
the camera position is known with sufficient accuracy. (2) Video cameras can be used to remotely and accurately measure ground surface displacement and velocity during a rapidly evolving landslide. (3) When static markers are present, the position and velocity
of a debris-flow front can be measured with accuracy comparable to that of lidar. (4) Using measurements acquired from an airborne platform, ground displacement can be recovered accurately under reasonable assumptions about the platform motion. These conclusions
demonstrate that airborne video measurements are on the brink of becoming a viable solution for obtaining ground displacement. Airborne measurements are faster and safer than the state of art, cover a wider area, and dramatically reduce environmental impact
of seismic acquisition surveys while maintaining the accuracy needed for a multitude of geophysical applications.</span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:black"> </span><span style="font-family:"-webkit-standard",serif;color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"-webkit-standard",serif;color:black;background:white">Hope you can join us!</span><span style="font-family:"-webkit-standard",serif;color:black"><o:p></o:p></span></p>
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<b><span style="font-size:10.0pt;color:#201F1E">Seminar Connection Instructions:</span></b><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:10.0pt;color:#201F1E">-- Turn your VPN services off.</span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:10.0pt;color:#201F1E">-- Join in via Microsoft Teams by <a href="https://teams.microsoft.com/dl/launcher/launcher.html?url=%2f_%23%2fl%2fmeetup-join%2f19%3ameeting_NmU4M2E3ZDktNmIwOS00Y2NkLWEyZmMtNGM3YTQwYjQxYTFm%40thread.v2%2f0%3fcontext%3d%257b%2522Tid%2522%253a%25220693b5ba-4b18-4d7b-9341-f32f400a5494%2522%252c%2522Oid%2522%253a%252282b4c0ea-89e9-402c-8d2a-8f68ffac5319%2522%257d%26anon%3dtrue&type=meetup-join&deeplinkId=354c7d10-e11c-4bfa-9af2-9aee09c70a3f&directDl=true&msLaunch=true&enableMobilePage=false&suppressPrompt=true" target="_blank" title="https://teams.microsoft.com/dl/launcher/launcher.html?url=%2f_%23%2fl%2fmeetup-join%2f19%3ameeting_NmU4M2E3ZDktNmIwOS00Y2NkLWEyZmMtNGM3YTQwYjQxYTFm%40thread.v2%2f0%3fcontext%3d%257b%2522Tid%2522%253a%25220693b5ba-4b18-4d7b-9341-f32f400a5494%2522%252c%2522">clicking
here</a>.</span><span style="color:black"><o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
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<span style="color:black">Take care,<o:p></o:p></span></p>
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<span style="color:black">matt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:black">Matthew A. Thomas</span></b><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black">Research Hydrologist (Mendenhall Fellow)</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black;background:white">1711 Illinois Street, Golden, CO 80403</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black;background:white">office: 303-273-8588 </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black;background:white">cell: 720-417-9021<br>
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</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><a href="https://www.usgs.gov/staff-profiles/matthew-a-thomas" title="https://www.usgs.gov/staff-profiles/matthew-a-thomas"><span style="font-size:10.0pt;background:white">USGS</span></a></span><span style="font-size:10.0pt;color:black"> |<span class="apple-converted-space"> </span></span><span style="color:black"><a href="https://www.researchgate.net/profile/Matthew_Thomas27" title="https://www.researchgate.net/profile/Matthew_Thomas27"><span style="font-size:10.0pt">Research
Gate</span></a></span><span class="apple-converted-space"><span style="font-size:10.0pt;color:black"> </span></span><span style="font-size:10.0pt;color:black">|<span class="apple-converted-space"> </span><a href="https://scholar.google.com/citations?user=Hg7I2YcAAAAJ&hl=en" title="https://scholar.google.com/citations?user=Hg7I2YcAAAAJ&hl=en">Google
Scholar</a></span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86;border:none windowtext 1.0pt;padding:0in">Francis Kevin Rengers, Ph.D. | Geomorphologist </span></b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#222222"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86">U.S. Geological Survey | Research Geologist </span></b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#222222"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86">1711 Illinois St. Golden, CO 80401 </span></b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#222222"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86">office: 303-273-8637 | cell: 720-618-0351</span></b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#222222"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Palatino Linotype",serif;color:#174E86"><a href="https://www.usgs.gov/staff-profiles/francis-rengers"><span style="color:#0563C1">https://www.usgs.gov/staff-profiles/francis-rengers</span></a></span></b><o:p></o:p></p>
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