reply to post by hidden0
I'll think of a method for storing alterations of data separately from their originals. This way we can reference side-by-side the changes of
data, and can perhaps question it in the future.
All it requires is the quake ID and before you update a change, insert the original record into a revisions table. Then flag the updated record as
I'm already running ~1200 earthquakes, so checking all 1200 for changes may be processor intensive. At the current rate, I am storing about
~150 earthquakes per day (all magnitudes and depths). I will have to do some research to see how to best implement this.
I do all of the foregoing in my QVS Data program but it is not web based. Currently I have 1,000,000+ earthquakes in the database. Changes happen on
earthquakes anything up to two years after the event, but no one out there is interested after 7 days or so. If you are going to grab
then you should add Italy, Spain, Chile, Columbia, Greece, Turkey, Thailand, Kazakhstan, Russia, Indonesia to mention a few to get
started. You should be looking to pack away about 3000 to 5000 quakes a day. Oh yes there is Australia as well and New Zealand - there at least you
get an XML file.
As for other sites, I was just curious. I don't want the USGS to be my only source, but I'm not having much luck finding for example the
Japan's equivalent of the USGS. I'll keep digging though, I hope to have quite a list of sources, maybe even with the option of only seeing EQ's
from specific sources.
Especially for you Japan
There are a number of sites (I suggest you look at the lists in my signature), but the problem is that if you are wanting to depend on RSS feeds -
which probably won't give you the updates - many of them do not have RSS/XML data. EMSC is best used by parsing the KML data which is what I do
otherwise you do not get the ID numbers and without them it is difficult to track changes. Japan is a pure and very intensive screen scrape (with no
IDs) requiring two file downloads for every quake. You also need to look out for nearly identical quakes and devise some way of dealing with them -
particularly with Japan since the lists that you have to scrape are not lists of earthquakes but lists of earthquake reports and a quake can appear
more than once. You have to devise your own ID numbers for these and check to see if they have been posted before. It took me nearly a year to get
that working properly.
ETA: I found the JGS (Japanese Geological Society) so I'm checking around for some XML feeds. They will probably be in Japanese
You could try Hinet but i did not want to have to register and their terms are very restricting.
In addition to all of that you must be aware of the scales being used if you are wanting to make comparisons. USGS use a number of different scales,
EMSC tend to use mb and Mw, Chile uses ML and Japan uses ML but ML is different for each area. Spain tends to use mbLg. Ideally you would convert all
the different scales to a rough approximation of Mw and display both the original and the conversion. Then there is energy. I am not interested in
numbers only the energy so it would have to have energy base on M0 (The starting point of the Mw calculation) to be of interest to me.
aggregate data about them on a daily (perhaps hourly or half-hourly) basis.
Try 5 minutes. Anything longer is not worth bothering with.
If they do make changes to the data, would you like me to do so as well or keep the original data?
If you don't change your data is not worth a light - but nearly all the sites out there do not so you would be in good company! It is only quake
nerds like me that are into the nitty gritty details.
Global Incident Map
Has it been done and I missed it?
, Live Earthquake Mashup
to mention three, all of which have multiple feeds. There are more out there if you look.
Whether these are similar to what you are planning I do not know, but good luck with your quest anyway.