1.0Steven Bleisteinhttps://stevenbleistein.net/jacd20sbrelansa22https://stevenbleistein.net/ja/author/cd20sbrelansa22/rich600338<blockquote class="wp-embedded-content" data-secret="RP7z1bwt64"><a href="https://stevenbleistein.net/ja/2013/12/change-and-refraction-layer/">[:en]Leading Change and the Refraction Layer[:ja]変化と屈折層[:]</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://stevenbleistein.net/ja/2013/12/change-and-refraction-layer/embed/#?secret=RP7z1bwt64" width="600" height="338" title="“[:en]Leading Change and the Refraction Layer[:ja]変化と屈折層[:]” — Steven Bleistein" data-secret="RP7z1bwt64" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://stevenbleistein.net/wp-includes/js/wp-embed.min.js </script>[:en]My father used to help people who set off explosions on the surface of the Earth. No, this was not for blowing things up. It is what is called “non-destructive testing” in hunting for oil. With the right kinds of sensors on the Earth’s surface and some sophisticated math, you can develop a image of the Earth’s interior many thousands of meters deep by interpreting the feedback of compression waves from the explosion. Imaging the Earth using compression waves is complex in part because of refraction layers. What’s a refraction layer? A layer whose substance is distinct from the layer above it. Refraction layers change waves. The more distinct the […]