reply to post by MoEskiMo
Problem with the above site is they only show EQ's for a certain length of time(less than 24 hours), but when comparing USGS with the incendent
map there were consistent inconsistencies-but no body was saying anthing, including myself. I just wondered about silently.
There are al minimum two feeds going to GI - USGS and EMSC. The fact that they use only 24 hours makes me think that they are taking 1 hour feeds, and
this has been demonstrated many time before that they fail to change/delete data and it drops off the end in it's erroneous state.
Further more, USGS do not normally report earthquakes under 4.5 globally, only in the US. EMSC similarly in the European area but the EMSC network
coverage also contains Argentina and apparently very recently Chile has become part of Europe
I will reiterate what TA says.
That site is basically NOT for the general public in the same way that some elements of EMSC are not for general
consumption yet are available.
The site itself says....
What defines an 'event'?
A seismic event is typically an earthquake, however, mine blasts and other naturally occurring phenomenon can have a similar signal to our sensors.
This interface does not differentiate between the seismic source.
If like TA, and to a lesser extent me, you spend many hours looking at seismograms or data streams of seismograms (GEE for example) you will be aware
that there are many many signals on a seismogram that are not earthquakes. The only organisation that removes data before it goes public is the USGS
as far as I am aware but that is only in specific areas that are sensitive securitywise and it is only very minor signals - signals that are NOT
You should also be aware that transmissions breaks, even very tiny ones, can cause the computers to register an earthquake where there is not one.
about how this happens. (This was at
The main sources that you should be looking at are the USGS
and/or GFZ Potsdam
From time to time these sites may disagree. USGS is on occasions lower in estimates than EMSC, however I can also tell you after about 2 months these
estimates have been revised to the same as EMSC in the ANSS catalog.
If you go to "If it rumbled magnitude 6+ it is here (within 24 hrs)" in my signature you will find a link to Provider Magnitude Comparisons 2012 which
I have just started maintaining.
The crux of the matter is an earthquake magnitude is not considered finalised until up to two years after the event
so what you
see on Global Incident et al that is here today, gone tomorrow, may not be either real or right. Even I only track the magnitudes back about a year
but the site I pointed you at (mine) will have maintained information on Mag 6+ and as such is probably the only one shop reference on the web for
corrected magnitudes as most don't care after a day or two.
edit on 5/7/2012 by PuterMan because: (no reason given)