tag:blogger.com,1999:blog-9959776.post5724594192751673644..comments2024-02-15T04:42:41.606+00:00Comments on James' Empty Blog: [jules' pics] 11/10/2009 07:51:00 PMJames Annanhttp://www.blogger.com/profile/04318741813895533700noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-9959776.post-18342762772689844872009-11-14T06:28:40.208+00:002009-11-14T06:28:40.208+00:00Just had an earthquake overnight - no warning, it ...Just had <a href="http://www.jma.go.jp/en/quake/3/20091114043355391-140423.html" rel="nofollow">an earthquake overnight</a> - no warning, it woke us up. But I don't think I'd like to be woken by blaring sirens if the system is going to give lots of <a href="http://www.asahi.com/english/Herald-asahi/TKY200908260061.html" rel="nofollow">false alarms</a>.James Annanhttps://www.blogger.com/profile/04318741813895533700noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-19283424213320503782009-11-12T10:46:12.700+00:002009-11-12T10:46:12.700+00:00Using a ballpark 8 km/sec P wave, in order to get ...Using a ballpark 8 km/sec P wave, in order to get a 10 sec warning time you need the epicentre about 80 km away, assuming there's an automated seismometer at ground zero.<br /><br />Of course, the P wave won't knock you down, so for surface wave arrivals you might get 10 seconds for something a half to a third that distance.C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.com