diff --git a/assets/3_Seismology/Seismology.pdf b/assets/3_Seismology/Seismology.pdf
index b9e4b96..c9ce4bb 100644
Binary files a/assets/3_Seismology/Seismology.pdf and b/assets/3_Seismology/Seismology.pdf differ
diff --git a/conf.py b/conf.py
index 564ac72..1077eba 100644
--- a/conf.py
+++ b/conf.py
@@ -123,6 +123,12 @@
     html_theme = 'sphinx_rtd_theme'
     html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
+
+# linkcheck_ignore = []
+linkcheck_retries = 3
+linkcheck_timeout = 500
+
+
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.