Talk:Epicenter

message: According to Merriam-Webster Online at , an epicenter is:
1:the part of the earth's surface directly above the focus of an earthquake.
According to Merriam-Webster Online at , a hypocenter is:
1:the focus of an earthquake; 2:the point on the earth's surface directly below the center of a nuclear bomb explosion.
However, I have seen many places which refer to the epicenter for an above ground explosion or some other news-worthy event.  I have revised the text of this article to not mention above ground explosions, but feel free to revert if you disagree.--Astronaut 20:25, 10 Mar 2005 (UTC)
replies: text: No, Merriam-Webster is correct.  It's the other way round: epicentre (or focus) = where the bomb goes off, hypocentre = point on ground vertically beneath epicentre.  Astronaut 23:23, 10 August 2007 (UTC)

text: I think the meaning of "above" is quite obvious and doesn't require further explanation.  Astronaut (talk) 17:22, 1 December 2009 (UTC)
thread_title:  Epicenters and hypocenters 

message: Removed this recent addition:
:epicentral distance-it is the angle subtended at the center of the earth between the point of recording and the epicenter.it is normally represented by degrees and represented by Δ.
:Δ1 degree=110 kilometeres
:and Δ cannot be greater than 180 degree
as it needs serious rewriting if it is to be included. Vsmith 13:19, 19 August 2006 (UTC)
thread_title: Removed for clarification

message: The third paragraph as it presently stands expounds at length on the various opinions of "the Usage Panel". What is this panel and why are its opinions treated with such reverence as to include them in an encyclopaedia article? 62.25.106.209 17:19, 6 March 2007 (UTC)
replies: text: No idea; but whoever added this apparently ripped it off somewhere - it was removed as a copyvio.  Astronaut 23:26, 10 August 2007 (UTC)
thread_title:  "Usage Panel" 

message: The result was merge into DESTINATION PAGE.  Astronaut (talk) 21:06, 17 May 2008 (UTC)
replies: text: Agreed --APShinobi My Contribs 15:37, 13 May 2008 (UTC)
thread_title:  Merge proposal: [[Epicentral distance]] 

message: epicenter is the point situated above the the focus it is the point on the surface of the earth from where the earthquake initiates the massive destruction takes place at the epicenter  —Preceding unsigned comment added by 122.162.137.88 (talk) 04:02, 26 August 2008 (UTC)
thread_title:  epicenter and focus 

message: Several references in Surface wave magnitude prints º as the unit for epicentral distance.  This is neither a measure of distance nor one of time.  What is the dimension of epicentral distance?  This is particularly troublesome because without proper understanding of all related units and their reference values, definitions cited in these sources, even the original Richter formula are incoherent. Sillyvalley (talk) 07:06, 14 September 2008 (UTC)
replies: text: I think ° (note degree symbol, not º) is a perfectly valid measurement of epicentral distance - measuring the number of degrees between the measuring station and the epicentre.  For example, an epicentral distance of 5° indicates the epicentre is approximately 556 km from the measuring station (calculated as follows: Earth circumference/360*5).  Astronaut (talk) 15:55, 15 September 2008 (UTC)
replies: text: Thanks.  This makes sense and needs to be added to the page - may need to find some citation, though.  BTW, the Chinese site actually prints º - making things even more confusing. (The other paper is a scanned Image.) Sillyvalley (talk) 17:24, 15 September 2008 (UTC)
thread_title:  Unit of "epicentral distance"? 

message: Link to image showing global earthquake epicenters, 1963–1998
(Copyied from earthquake)  — Preceding unsigned comment added by Tideflat (talk • contribs) 17:29, 3 June 2012 (UTC)
replies: text: There is no need to show the actual image here when you can provide an explanetory link.  Astronaut (talk) 17:32, 4 June 2012 (UTC)

text: What do you mean by "image queue" and why bring this image here?  I don't understand what you are trying to show.  Astronaut (talk) 17:32, 4 June 2012 (UTC)
thread_title:  image queue  

message: I reverted this edit.  Firstly, I doubt this is true.  I can find no evidence for the existance of Gods Walk Among Us by Henry Gull, and the reference "London public library" is worryingly imprecise.  Unless 2.102.33.138 (or anyone else) can come up with compelling evidence of this, I think it should stay removed.  Astronaut (talk) 11:26, 16 September 2013 (UTC)
replies: text: The term was coined by Robert Mallet e.g., although I haven't managed to find an exact date for that. Mikenorton (talk) 19:44, 16 September 2013 (UTC)
thread_title:  First use in 1874?