Originally posted by Max_TO
Seems we are hearing of a new quake just about every week for the last , what 3 weeks now ?
I have never experienced a quake first hand but from what I have been lead to believe a 5 is not all that bad ? I guess thats easy for me to say
having not ever experienced a quake . Lets just hope the earth gives it a rest for the time being .
Actually, earthquakes occur way more often than we are lead to believe: just recently (and fortunately) especially thanks to the internet we are able
to learnin almost real time about any event, including this one from Iran that isn't even newsworthy (it made the news just because it occurred
there): if some glass has broken during that shock in Iran, then i would be very very surprised. Only during the last week, without considering Haiti
eartquake's main and foreshocks, something like 30 earthquakes of MAG.>4.9 occurred worldwide:
MAG|UTC DATE|TIME|DEPTH (Km)|Region
and no, they're not some out of the ordinary data. They're out of the ordinary only to the eyes of those who have never paid any attention before to
the topic: actually, given their unpredictability, they can't be called "ordinary", but nothing in what's going on suggests any out of
(relatively) ordinary activity: and the one occurred in Iran was not even worthy to be mentioned by news agencies, i'll make some comparisons between
this one and what happened to Haiti:
compared to this one, the Haitian earthquake was approx. 125 times bigger on a seismogram, but it was approx. 1400 times stronger (energy release).
Plus, the depht of the Haitian one was approx. 13 km (8.1 miles), while the Iranian one's was 70.7 km (43.9 miles);
the Haiti's one falls into the "Major earthquake" basket, while the Iran's one falls into the "LIGHT (not moderate) earthquake" one;
the frequency of earthquakes like the Haiti's one is approx. 18 per year;
the frequency of earthquakes like the Iran's one is approx. 6,200 per year;
the depht of the haitian one was surfacial (>0-70km)
the depht of the iranian one was between surfacial (0-70km) and medium (70-300 km): needless to say, the higher is depth, the more are the variables
which will keep down the strenght perceived in surface, while what most affects both death toll and damage is the ability of Buildings, infrastructure
and utilities to withstand Earthquakes.
Anyway, this iranian case is a classic example of sensationalistic journalism by Reuters, the reasons why they consider this event newsworthy is
beyond my understanding.
Max_TO, thanks for sharing