Earthquake Frequency, page 1

Here's a graph I made by creating my own database out of the USGS database of earthquakes around the world since 1973. I started at 1980 just to lessen the "we didn't have the technology to detect stuff" effect. Still the effect of incomplete surveying is likely there, but the trend all the way upto 2005 is pretty obvious! But there is something else I noticed that is also very interesting....



What is not shown on this graph is a detailed monthly analysis (the graph is all yearly numbers). But if one was to take a look at monthly frequency of earthquakes of magnitude 1.0 to 2.4, you'd see that in the last 12 months or so (starting July 2004 and still continuing), there is a huge ABSENSE of earthquake data (only for the frequencis 1.0 upto 2.4). I am not sure why that is. I doubt it's because the earthquakes of those magnitudes suddenly "stopped" (thought if that is the case, that is pretty freaky eh?), and my thought is that either they did not update the database in that area (intentionally or not?), or they had problems detecting the earthquake using whatever means they have to detect worldwide quakes.

Most probable in my mind is that this is a database issue, so the question is, why are the last 12 months of earthquakes of magnitude 1.0 to 2.4 almost entirely missing from the database? They are not COMPLETELY gone, but there is a 90% decrease in frequency!

Have a look for yourself: wwwneic.cr.usgs.gov...

I emailed the "web team" and hopefully I get a response. Does anyone else think that this is rather odd? It's not that it is not up to date, the data is very much up to date - but there is 90% less earthquakes of magnitude 1.0 to 2.4 in the last 12 months for one reason or another. I'm going to make another graph so the sudden almost total drop is clearly seen

P.S. - apparently other websites like "infoplease.com" are using that same database because they too have the same "hole" in their data. So far I haven't seen another website of earthquake data that does not suffer from this giant omission.

[edit on 24-6-2005 by lilblam]

Good job Lil

Have you looked here earthquake.usgs.gov...
there date has lots of 2.0 quakes

Originally posted by MauiStacey
Have you looked here earthquake.usgs.gov...
there date has lots of 2.0 quakes

Nope, it doesn't! Not since july of 2004, almost all quakes of magnitude 1.0 to 2.4 are mysteriously missing. Look at the very page you gave me, can you spot any 2.0 quakes? I can see plenty of 2.5 and above....

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