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--></style></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><b><span style='font-size:9.5pt;color:red'>Hydrologic impacts of landslide disturbances: Implications for remobilization, hazard persistence, and landslide early warning</span></b><o:p></o:p></p><p class=MsoNormal><b><span style='font-size:9.5pt;color:red'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Arial",sans-serif'><br></span></b><b>Dr. Ben Mirus, USGS Geologic Hazards Science Center, Golden, CO</b><br><b><span style='font-size:9.5pt;font-family:"Arial",sans-serif'><br></span></b>The most deadly landslides in recent U.S. history resulted from reactivation of existing landslides. Motivated by these tragedies and other landslide-related losses, we investigated why recent landslides may be less stable than similar hillslopes nearby. Observations and hydrologic monitoring near Seattle, Washington reveals that some hillslopes remain stable in part because roots reinforce the soils, but also because the vegetated soils drain efficiently following major rainstorms. In contrast, landslides disrupt vegetation and soil properties, reducing water use and drainage efficiency. As a result, recent landslides in the area become wetter earlier in the winter rainy season than undisturbed hillslopes and also stay wetter longer after the rains ended. <br><br>The combination of reduced root strength and the persistence of wetter soil are “self-driving” factors that contribute to remobilization of recent landslides. This increased potential for recurring slope failures complicates our ongoing efforts to employ hydrologic monitoring and modeling to establish physically based landslide early warning criteria for the Seattle-Everett railway line along Puget Sound. <br><span style='font-size:9.5pt'><br><br><br><br></span><o:p></o:p></p><div><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>Tuesday, January 23rd, 2018</span></b><o:p></o:p></p></div><p class=MsoNormal><br><br><br><br><o:p></o:p></p><div><div><div><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>10-11 am</span></b><o:p></o:p></p></div><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial",sans-serif'> </span></b><o:p></o:p></p></div></div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> (Mountain Time)</span></b><br><b><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>USGS, 1711 Illinois Street, Golden, CO</span></b><br><b><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>Entry Level <span class="gmail-m-5774647939884066761gmail-m-4171596897656218249m9106775657748341738gmail-m-1921791487083127966gmail-m4140643564653640769m-4556382912284060029m2261340191774375389gmail-m3025069362589959092gmail-m-8968070735390492279m4896026561608388806gm">Seminar</span> Room</span></b><br><span style='font-size:9.5pt;font-family:"Arial",sans-serif'><br>*Note: Please arrive <u>~5 minutes early</u> and <u>bring photo ID</u> for airport-style security measures now in place at the USGS building.</span><br><span style='font-size:9.5pt'><br></span><span style='font-size:10.0pt'>Thank you,</span><br><span class="gmail-m-5774647939884066761gmail-m-4171596897656218249m9106775657748341738gmail-m6925426022411937115m7055967733504661449gmail-m-8968070735390492279m4896026561608388806gmail-m3918809983636524111m7068817575649352729m-6172873775242136948gmail-m-"><span style='font-size:10.0pt'>GHSC</span></span><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> </span><span class="gmail-m-5774647939884066761gmail-m-4171596897656218249m9106775657748341738gmail-m6925426022411937115m7055967733504661449gmail-m-8968070735390492279m4896026561608388806gmail-m3918809983636524111m7068817575649352729m-6172873775242136948gmail-m-"><span style='font-size:10.0pt'>Seminar</span></span><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> Committee </span><br><span style='font-size:9.5pt'><br>Mirus, Ben - </span><a href="mailto:bbmirus@usgs.gov" target="_blank"><span style='font-size:9.5pt'>bbmirus@usgs.gov</span></a><br><span style='font-size:10.0pt'>Josh Rigler - </span><a href="mailto:erigler@usgs.gov" target="_blank"><span style='font-size:10.0pt'>erigler@usgs.gov</span></a><br><span style='font-size:10.0pt'>Oliver Boyd - </span><a href="mailto:oboyd@usgs.gov" target="_blank"><span style='font-size:10.0pt'>oboyd@usgs.gov</span></a><br><br>-------------------------------------------------<br><br><span style='font-size:9.5pt'>Note: to add or remove your email from this list, please click the link below or send an email directly to the listserve and await further instructions. </span><o:p></o:p></p><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><div><p class=MsoNormal> <o:p></o:p></p></div></div></blockquote><p class=MsoNormal> <o:p></o:p></p></div></body></html>