Posted on 04/07/2011 7:49:24 AM PDT by Sprite518
JAPAN ROCKED BY NEW QUAKE; TSUNAMI ALERT... DEVELOPING...
(Excerpt) Read more at drudgereport.com ...
Sounds like so far, so good.
see posting 18 re earthquake today near Veracruz Mexico.
“20th floor of a building when the first one hit”
That’s safer than a 5-story building. The period of a 20+story building is longer than the earthquake’s main energy
Aftershock zones can be defined in two different ways...
An aftershock is actually just a normal earthquake in every physical detail. Out of context, there is no way to tell the difference between any arbitrary earthquake and an “aftershock”. The only real difference between the two is that an aftershock follows closely in the wake of a larger earthquake, and in roughly the same location as its predecessor. That larger, initial earthquake is usually referred to as the “mainshock”.
More specifically, there are two guidelines for labelling an earthquake as an aftershock. First, it must occur within an “aftershock zone.” This is sometimes defined as within one fault-rupture length of the mainshock rupture surface, or alternatively, within an area defined by seismologists based upon early aftershock activity. Second, it must occur within that designated area — the “aftershock zone” — before the seismicity rate in that area returns to its “background”, meaning pre-mainshock, level. If an earthquake meets these two criteria, seismologists consider it an “aftershock.”
http://www.scec.org/education/public/allfacts.html
You aren’t the only one.
It most likely will be recorded as an aftershock. No, a month is actually too SHORT of a period of time for quakes to be considered an aftershock, which can be years for some locations.
OH NO! prayers for these poor folks!
for your MTW ping list as this is the area of the original earthquake. Prayers continue for those folks.
Thank you, I did not know that... I am bookmarking the link to study up up it.
Bikk
P.S. hope all of us Freepers (in Japan) can get some sleep tonight, I am sure the big one for now is over.
Well there certainly is a portion of New York City that has disappeared and has not been rebuilt.
It all depends upon when the size and numbers of quakes return to pre-shock levels. With an area as historically active as Japan, this may prove to be a challenge for seismologists.
or these have all been foreshocks to a larger event. Not likely, but who knows for sure....
My opinion Edgar Cayces earthquake predictions are off (late) by a generation. And just half or less will pan out
Unfortunately, Washington state is probably next. I have family there. In fact, one of my uncles is clearing out his belongings and trying to get things in order to leave Seattle specifically because of what happened in Japan.
yep
Stay safe, FRiend
Not very likely, the 9.0 event released a lot of pent-up energy.
However, it (the 9.0) did have a 7.4(not precise on the size, other than it was greater than 7) foreshock about two to three days prior.
Again, given the energy released (100 x larger than a 7.0), an even larger shock would be considered unlikely.
In ye old classical Japan an earthquake had little impact although a tsunami would. In old Japan the bamboo and wood and paper houses just swayed a bit. Water in the rice fields rippled. Big deal.
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