Western Nagano Pref 6.8 14 Sep 1984 and aftershocks
I'm getting a lot of views of this page on japanquakes, whether they are from ATS or just general interested readers, not sure.
As I went on into October and November of 1984 I thought "geez thats a heck of a lot of aftershocks for a M5.7?" (1734)
So I did a bit of further research.
Turns out this was an earthquake of quite significance for Japan;
1. It was a 6.8ML, not a 5.7 (NIED archive data hadn't been updated).
2. There was a 6.2 aftershock the next day.
3. It was related to the Mt Ontake volvanic eruption of 1979 (also erupted last year, people killed).
4. Radon and other gasses were observed before the earthquake (also noted at the L'Aquilla earthquake in Italy in 2009).
5. There was a major landslide caused by the earthquake, debris filled an entire valley and changed the course of the Otaki River.
So this morning I gave it the treatment that it really deserves and rebuilt the page.
Changed the first map and graph of aftershocks from 16 days to 11 weeks.
Updated the maps and graphs for 3 days and 7 days, and made new pies to go with them all.
, same address as the old page, new title.
its a bit of a pain how the direct link starts the page half way down the screen, thats a defect in the Blogger template.
the best way to get the page as a popup which fills the full screen, is to type 1984 into the search box top right of the home page and then "view
all" at the bottom, then clickon the Western Nagano Pref 6.8 Sep 1984 pie