<a href="https://en.wikipedia.org/wiki/Cascadia_subduction_zone" class="extiw" title="en:Cascadia subduction zone">Cascadia subduction zone</a>. This is the site of recurring <a href="https://en.wikipedia.org/wiki/megathrust_earthquake" class="extiw" title="en:megathrust earthquake">en:megathrust earthquakes</a> at average intervals of about 500 years, including the <a href="https://en.wikipedia.org/wiki/Cascadia_Earthquake" class="extiw" title="en:Cascadia Earthquake">en:Cascadia Earthquake</a> of <a href="https://en.wikipedia.org/wiki/1700" class="extiw" title="en:1700">en:1700</a>.
<p>The original uploader was <a href="https://en.wikipedia.org/wiki/User:Curps" class="extiw" title="wikipedia:User:Curps">Curps</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>.
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Later versions were uploaded by <a href="https://en.wikipedia.org/wiki/User:Remember_the_dot" class="extiw" title="en:User:Remember the dot">Remember the dot</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>.
<a rel="nofollow" class="external free" href="https://earthquake.usgs.gov/eqinthenews/2004/usslav/rupture_area-nw.html">https://earthquake.usgs.gov/eqinthenews/2004/usslav/rupture_area-nw.html</a>, specifically <a rel="nofollow" class="external free" href="https://earthquake.usgs.gov/eqinthenews/2004/usslav/rupture_area-nw.gif">https://earthquake.usgs.gov/eqinthenews/2004/usslav/rupture_area-nw.gif</a>