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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Sort of off topic for a model airplane club but this is s</span><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>ome cool animation of the Atwood building’s response to January’s earthquake<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Hi All:<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>FYI - Mehmet Celebi (USGS structural engineer) worked with colleagues to produce a great animation of the shaking of the Atwood building in the recent M7.1 Iniskin earthquake in Alaska. The video is on youtube at:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><a href="https://www.youtube.com/watch?v=Nt0m5JWa62w">https://www.youtube.com/watch?v=Nt0m5JWa62w</a> <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>And on the USGS website at:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><a href="http://gallery.usgs.gov/">http://gallery.usgs.gov</a> <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>The Atwood building is the second tallest building in the state (20 stories), and I’m told is typical steel frame construction of this sort of skyscraper, and it is not base isolated. A bit more information on the building is here:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><a href="https://en.wikipedia.org/wiki/Robert_B._Atwood_Building">https://en.wikipedia.org/wiki/Robert_B._Atwood_Building</a> <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>The structure has extensive strong motion instrumentation throughout the building, so the animation is from actual data - it’s not a model. The bottom right shows the ‘input’ seismogram from the base of the building. You can see the maximum displacement is roughly 30 cm, and note the exaggeration is 300x. It takes a short bit to get through the intro and the part where there is not much shaking from the P-wave. It’s impressive to me how long the shaking goes on. Anyway, enjoy. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Cheers, Peter<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-family:"Helvetica",sans-serif'>__________________<br>Peter J. Haeussler<br>U.S. Geological Survey<br>4210 University Dr.<br>Anchorage, AK 99508<br>907-786-7447 office<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica",sans-serif'>907-862-6586 cell<br><a href="mailto:pheuslr@usgs.gov">pheuslr@usgs.gov</a><o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></blockquote></div><p class=MsoNormal><o:p> </o:p></p></div><br />
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