Talk:List of earthquakes in Japan

Orphaned references in List of Earthquakes in Japan
I check pages listed in Category:Pages with incorrect ref formatting to try to fix reference errors. One of the things I do is look for content for orphaned references in wikilinked articles. I have found content for some of List of Earthquakes in Japan's orphans, the problem is that I found more than one version. I can't determine which (if any) is correct for this article, so I am asking for a sentient editor to look it over and copy the correct ref content into this article.

Reference named "USGS": From 1933 Sanriku earthquake:  From 1946 Nankaidō earthquake:  

I apologize if any of the above are effectively identical; I am just a simple computer program, so I can't determine whether minor differences are significant or not. AnomieBOT ⚡ 09:04, 24 February 2009 (UTC)

Messed up
The table is messed up. Some dates have been shifted to magnitude, and many other errors occur - this happens when I try to sort the earthquakes by date or magnitude, the raw table (after page load) looks fine. --Piotr Konieczny aka Prokonsul Piotrus 19:38, 11 March 2011 (UTC)
 * The problem is the decision to group the recent aftershocks in a single date. It sounds like a good idea until you try sorting the table. I'll try and fix that. Pichpich (talk) 22:03, 11 March 2011 (UTC)

Please note that when you do lists that are dated, please please please have the newest dates at the top, oldest dates at the bottom.138.67.12.12 (talk) 22:02, 8 August 2016 (UTC) John Stockwell

Double Current events
The march 11th quake has two entries. these should be merged at the bottom of the chart. Also, the epicenters need to be cleaned up, to indicate which represent aftershocks, and which one is the main quake, or perhaps put the aftershocks as separate quakes. 216.16.232.122 (talk) 19:55, 11 March 2011 (UTC)

Sortable table
The choice was made earlier today to group the main quake with the aftershocks that occurred on the same day rather than list them separately. That sounds perfectly reasonable. However the use of rowspans destroys the possibility to sort the table according, say, to magnitude. That's a really bad side effect for such an article so I've separated the aftershocks (there was already a separately listed foreshock) Pichpich (talk) 22:22, 11 March 2011 (UTC)
 * Thanks, it's better. Any chance we can get magnitude numbers for January 13, 1945 and April 9, 1858? --Piotr Konieczny aka Prokonsul Piotrus 23:27, 11 March 2011 (UTC)
 * The ja.wiki gives a magnitude 6.8 (Richter) for the 1945 quake and 6.7 (Richter) for the 1858 quake. I don't speak/read any Japanese though so I don't know how solid the references are and given the circumstances around the 1945 quake and the age of the 1858 quake, these are probably guesstimates anyway. Still, it's tempting to include them to complete the table. Pichpich (talk) 23:52, 11 March 2011 (UTC)
 * I'd support moving them here, if they are reference, the reference can be copied. Sooner or later, somebody will translate and/or review them... --Piotr Konieczny aka Prokonsul Piotrus 23:56, 11 March 2011 (UTC)
 * As the one who did it, my apologies; I thought it looked neater that way and didn't notice that the table was sortable. (Someone really ambitious could improve the sorting javascript to make it able to cope, of course...) 71.41.210.146 (talk) 21:25, 12 March 2011 (UTC)

Aftershocks
Why does this article contain a list of aftershocks of the 2011 Sendai earthquake and tsunami? when nearly every earthquake has aftershocks?Peaceworld111 (talk) 00:28, 14 March 2011 (UTC)
 * Well there's a threshold of 6.5 Mw to be listed. It so happens that the recent earthquake was so powerful that even its aftershocks (and one foreshock) happen to reach that threshold. I agree that it looks a bit silly though I'm not really happy with completely removing the info either. Pichpich (talk) 02:10, 14 March 2011 (UTC)

Changing the threshold
I'm proposing to change the lede and change the criteria for inclusion from "6.5 magnitude or above" to "over 7.0 magnitude or which caused significant damage or casualties." This is the threshold for other lists such as List of 21st-century earthquakes. Comments? Pichpich (talk) 13:25, 17 March 2011 (UTC)
 * I'd be fine with "7.0 or above or which caused significant damage or casualties." ··· 日本穣 ? · 投稿  · Talk to Nihonjoe ·  Join WikiProject Japan ! 15:52, 17 March 2011 (UTC)

To be added
I've come across the following earthquakes, at least some of which might qualify for inclusion in this list. I don't have full information about them, so I'm listing them here instead of in the article. Some of the names are likely not correct. If someone would like to research these and add them to the list, as necessary, that would be great. - dcljr (talk) 06:49, 26 April 2013 (UTC)
 * 0887-08-26 "Ninna earthquake" (List of tsunamis — although the Japanese version translates as "Renhe Nankai earthquake", according to Google Translate)
 * 1096-12-19 "Eicho earthquake"
 * 1856-08-23 "Ansei Hachinche? Oki? earthquake" (not listed at Ansei Great Earthquakes, nor 1855 Ansei Edo earthquake)
 * 1983-03-26 Sea of Japan earthquake

USGS or JMA?
There was an earthquake today which the USGS has logged at M6.7 and the JMA at M7.0. Which figure do we go with? Right on the borderline of eligibility for inclusion... Buttons to Push Buttons (talk | contribs) 08:09, 14 November 2015 (UTC)
 * We shouldn't be listing this one at all. Our list articles should not contain low intensity events. Dawnseeker2000  17:55, 14 November 2015 (UTC)
 * Well the lead states "This is a list of earthquakes in Japan with either a magnitude greater than or equal to 7.0 ...". If it is, indeed, a 7.0 then it is of a large enough intensity to warrant inclusion. But if it's only a 6.7 then sure, I agree. I just don't know which figure is more reliable in this instance: the largest earthstopquake tracking system or the local one? Buttons to Push Buttons (talk | contribs) 09:57, 16 November 2015 (UTC)
 * The Japanese and American agencies are both fine to use. One is not considered more reliable than the other; they just arrived at different figures due to different equipment/networks/methods. Our lists should probably start including intensity as a basis for inclusion. Dawnseeker2000  18:53, 16 November 2015 (UTC)

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No tsunamis created when USA did atomic testing in Pacific
Were there absolutely no tsunamis generated when the USA did atomic bomb testing in the Pacific Ocean? CaribDigita (talk) 03:30, 17 April 2018 (UTC)

Kawasumi scale
A citation was added to the Kawasumi scale back in 2011 and many magnitude types were changed to Mk at that point. The Kawasumi scale is little used in the scientific literature - google scholar gives just six hits, so it's not clear that we should use it here. When I have a moment, I will go through and check the magnitude types used in this list. Mikenorton (talk) 10:49, 15 May 2020 (UTC)
 * Another problem with the Kawasumi scale is that it, like the Modified Mercalli scale is an intensity scale.--Samesawed (talk) 15:07, 13 October 2021 (UTC)
 * According to this USGS report there is a Kawasumi magnitude scale (see page 6), although it is derived from intensity data. Mikenorton (talk) 15:49, 13 October 2021 (UTC)

Possible copyright problem
This article has been revised as part of a large-scale clean-up project of multiple article copyright infringement. (See the investigation subpage) Earlier text must not be restored, unless it can be verified to be free of infringement. For legal reasons, Wikipedia cannot accept copyrighted text or images borrowed from other web sites or printed material; such additions must be deleted. Contributors may use sources as a source of information, but not as a source of sentences or phrases. Accordingly, the material may be rewritten, but only if it does not infringe on the copyright of the original or plagiarize from that source. Please see our guideline on non-free text for how to properly implement limited quotations of copyrighted text. Wikipedia takes copyright violations very seriously. Moneytrees🏝️Talk🌴Help out at CCI! 02:53, 9 January 2021 (UTC)

Unreadable
What a badly organized page this is, if one is viewing it on a smartphone. It is unreadable. Get real, people! Only 0.001% of the world's population are NOT viewing this on a smart phone. Charles Clark (talk) 00:08, 11 February 2023 (UTC)

Deads & Photos in Tables?
Hi folks, I changed number of deaths to 19,759 in 2011 Tohoku as in the main article. I also would like to ask why there are photos inside the table. Removing the photos would help readers in reading the table.Kavas (talk) 23:23, 14 February 2023 (UTC)