<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div>Author: Jeff Freymueller</div><div><br></div><div>I have calculated predicted displacements from yesterday’s earthquake for IGS stations and other CGPS sites that I know about in the area. The predictions use the US Geological Survey (USGS) Finite Fault model version 1 (from Gavin Hayes, USGS National Earthquake Information Center). I used the program ffaultdisp from Sergey Kolesov of Moscow State University, which implements the standard Okada dislocation code. I checked these against the displacements computed by the USGS Coulomb program, and these were slightly different (a few percent). I am not sure why they are different, but I suspect that this is either due to differences in map projection to x-y coordinates, or a slight inconsistency in the definition of the location of the fault in the input format. </div><div><br></div><div>Key assumptions and caveats:</div><div><br></div><div>1. Near-field displacements may be poorly predicted because the USGS finite fault model, determined from teleseismic data, has limited resolution on the spatial distribution of slip. Near-field GPS sites are extremely sensitive to the details of the slip distribution.</div><div><br></div><div>2. Far-field displacements may be biased because the calculation done here assumes a uniform half-space rather than a more realistic spherical layered space.</div><div><br></div><div>These displacements should be used as a guide rather than as values that could be used to correct GPS site locations. However, if a substantial displacement is predicted you can expect that a substantial displacement will be observed. The IGS site AREQ did not move very much because the earthquake was located well to the south of this station.</div><div><br></div><div><br></div><div>USGS Finite Fault model:</div><div><a href="http://earthquake.usgs.gov/earthquakes/eventpage/usc000nzvd#scientific_finite-fault">http://earthquake.usgs.gov/earthquakes/eventpage/usc000nzvd#scientific_finite-fault</a></div><div><br></div><div><br></div><div>Web page for ffaultdisp:</div><div><a href="http://ocean.phys.msu.ru/projects/ffaultdisp/">http://ocean.phys.msu.ru/projects/ffaultdisp/</a></div><div><br></div><div>Site longitude latitude east north up (displacements in meters)</div><div><br></div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">AREQ -71.493196 -16.465669 -0.00009 0.00038 -0.00418</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">COLO -67.803979 -22.167384 -0.01241 0.00444 -0.00125</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">ARE2 -71.493016 -16.465264 -0.00009 0.00038 -0.00418</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">ARE1 -71.493196 -16.465669 -0.00009 0.00038 -0.00418</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">UNSA -65.407643 -24.727457 -0.00238 0.00077 -0.00041</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">COPO -70.338236 -27.384527 0.00026 -0.00023 -0.00094</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">IQQE -70.131718 -20.273544 -0.56603 0.02360 -0.34515</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">UEPP -51.408534 -22.119905 -0.00080 -0.00000 0.00013</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">TUCU -65.230352 -26.843255 -0.00094 0.00027 -0.00046</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">LCEN -68.602603 -25.326061 -0.00054 -0.00020 -0.00150</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">LLST -68.520184 -25.165462 -0.00067 -0.00015 -0.00154</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">JRGN -70.574909 -23.288917 0.00117 -0.00281 -0.00433</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">PCCL -70.106744 -18.457674 -0.11396 -0.10402 -0.04333</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">UTUR -67.205542 -22.242005 -0.01068 0.00333 -0.00054</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CDLC -69.761524 -22.189636 -0.00450 -0.00107 -0.00707</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CLLA -69.35665 -20.954484 -0.08602 0.03197 -0.01687</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CTLR -70.096828 -21.964162 -0.00272 -0.00677 -0.00892</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">QUET -67.343328 -22.198357 -0.01129 0.00361 -0.00065</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">SRGD -69.347835 -22.871137 -0.00290 0.00003 -0.00427</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">ATJN -70.136751 -19.300815 -0.30064 -0.13171 -0.14933</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CBAA -68.44815 -22.746369 -0.00663 0.00270 -0.00257</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CHMZ -69.194167 -19.668538 -0.16085 -0.03077 -0.02309</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CJNT -67.760575 -23.027491 -0.00589 0.00228 -0.00151</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">MCLA -70.247502 -22.745815 0.00043 -0.00415 -0.00592</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">PTRE -69.574329 -18.194288 -0.06083 -0.05008 -0.01251</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">VLZL -69.964689 -23.117231 -0.00021 -0.00225 -0.00462</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CGTC -70.068966 -20.177126 -0.58761 -0.04091 -0.32742</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CMPN -70.685824 -29.028204 0.00023 -0.00010 -0.00062</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">AREV -71.492796 -16.465516 -0.00009 0.00038 -0.00418</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">SCRZ -63.159674 -17.796791 -0.00527 -0.00134 0.00075</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">SOCM -68.295165 -24.454613 -0.00142 0.00020 -0.00172</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CHAC -58.959693 -27.420439 -0.00088 0.00021 -0.00001</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CUIB -56.069867 -15.555262 -0.00130 -0.00035 0.00023</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">PPTE -51.408534 -22.119903 -0.00080 -0.00000 0.00013</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">YCBA -63.679985 -22.017103 -0.00509 0.00062 0.00045</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CATA -65.774121 -28.470984 -0.00043 0.00006 -0.00047</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">AREQ -71.493196 -16.465669 -0.00009 0.00038 -0.00418</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">COLO -67.803979 -22.167384 -0.01241 0.00444 -0.00125</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">ARE2 -71.493016 -16.465264 -0.00009 0.00038 -0.00418</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">ARE1 -71.493196 -16.465669 -0.00009 0.00038 -0.00418</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">UNSA -65.407643 -24.727457 -0.00238 0.00077 -0.00041</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">COPO -70.338236 -27.384527 0.00026 -0.00023 -0.00094</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">IQQE -70.131718 -20.273544 -0.56603 0.02360 -0.34515</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">UEPP -51.408534 -22.119905 -0.00080 -0.00000 0.00013</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">TUCU -65.230352 -26.843255 -0.00094 0.00027 -0.00046</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">LCEN -68.602603 -25.326061 -0.00054 -0.00020 -0.00150</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">LLST -68.520184 -25.165462 -0.00067 -0.00015 -0.00154</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">JRGN -70.574909 -23.288917 0.00117 -0.00281 -0.00433</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">PCCL -70.106744 -18.457674 -0.11396 -0.10402 -0.04333</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">UTUR -67.205542 -22.242005 -0.01068 0.00333 -0.00054</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CDLC -69.761524 -22.189636 -0.00450 -0.00107 -0.00707</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CLLA -69.35665 -20.954484 -0.08602 0.03197 -0.01687</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CTLR -70.096828 -21.964162 -0.00272 -0.00677 -0.00892</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">QUET -67.343328 -22.198357 -0.01129 0.00361 -0.00065</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">SRGD -69.347835 -22.871137 -0.00290 0.00003 -0.00427</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">ATJN -70.136751 -19.300815 -0.30064 -0.13171 -0.14933</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CBAA -68.44815 -22.746369 -0.00663 0.00270 -0.00257</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CHMZ -69.194167 -19.668538 -0.16085 -0.03077 -0.02309</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CJNT -67.760575 -23.027491 -0.00589 0.00228 -0.00151</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">MCLA -70.247502 -22.745815 0.00043 -0.00415 -0.00592</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">PTRE -69.574329 -18.194288 -0.06083 -0.05008 -0.01251</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">VLZL -69.964689 -23.117231 -0.00021 -0.00225 -0.00462</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CGTC -70.068966 -20.177126 -0.58761 -0.04091 -0.32742</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CMPN -70.685824 -29.028204 0.00023 -0.00010 -0.00062</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">AREV -71.492796 -16.465516 -0.00009 0.00038 -0.00418</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">SCRZ -63.159674 -17.796791 -0.00527 -0.00134 0.00075</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">SOCM -68.295165 -24.454613 -0.00142 0.00020 -0.00172</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CHAC -58.959693 -27.420439 -0.00088 0.00021 -0.00001</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">CUIB -56.069867 -15.555262 -0.00130 -0.00035 0.00023</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">PPTE -51.408534 -22.119903 -0.00080 -0.00000 0.00013</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233);">YCBA -63.679985 -22.017103 -0.00509 0.00062 0.00045</div><div style="margin: 0px; font-size: 13px; font-family: Monaco; background-color: rgb(255, 254, 233); position: static; z-index: auto;">CATA -65.774121 -28.470984 -0.00043 0.00006 -0.00047</div><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: 'Lucida Grande'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="font-size: 12px; "><div><br class="Apple-interchange-newline"><br></div><div>Dr. Jeffrey T. Freymueller Office: 907-474-7286</div><div>Geophysical Institute Cell: 907-378-7556</div><div>University of Alaska, Fairbanks Home: 907-479-3550</div></span></span><span class="Apple-style-span" style="font-size: 12px; ">Fairbanks, AK 99775-7320 email: <a href="mailto:jeff.freymueller@gi.alaska.edu">jeff.freymueller@gi.alaska.edu</a></span><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: 'Lucida Grande'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="font-size: 12px; "><div>URL: <a href="http://www.gps.alaska.edu/jeff/jeff.html">http://www.gps.alaska.edu/jeff/jeff.html</a></div><div><br></div><div>Download Alaska GPS data: <a href="ftp://gps.alaska.edu/pub/gpsdata/">ftp://gps.alaska.edu/pub/gpsdata/</a></div><br class="Apple-interchange-newline"></span></span><br class="Apple-interchange-newline"></span>
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