diff --git a/content/lectures.json b/content/lectures.json
index ebf36a9..a167ee7 100644
--- a/content/lectures.json
+++ b/content/lectures.json
@@ -81,5 +81,12 @@
         "author": "Doug Oldenburg",
         "youtube": "NUrUbOjUMq4",
         "pdf": "3_Seismology/Seismology.pdf"
+    },
+    "11":{
+        "title": "Seismic 4",
+        "date": "2016-10-07",
+        "author": "Doug Oldenburg",
+        "youtube": "8XhqadeTofg",
+        "pdf": "3_Seismology/Seismology.pdf"
     }
 }
diff --git a/content/lectures.rst b/content/lectures.rst
index f9ab9a2..e041080 100644
--- a/content/lectures.rst
+++ b/content/lectures.rst
@@ -323,4 +323,31 @@ Seismic 3
 
         
 
+        
+.. _lecture_11:
+
+Seismic 4
+---------
+
+
+*October 07, 2016*
+
+
+- `Seismology lecture slides <https://github.com/ubcgif/eosc350website/raw/master/assets/3_Seismology/Seismology.pdf>`_
+            
+
+
+        
+
+
+.. raw:: html
+
+    <div style="margin-top:10px; margin-bottom:20px;" align="center">
+    <iframe width="560" height="315" src="https://www.youtube.com/embed/8XhqadeTofg?rel=0" frameborder="0" allowfullscreen>
+    </iframe>
+    </div>
+
+
+        
+
         
\ No newline at end of file