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TI2WMP > ALL 09.01.09 08:24l 43 Lines 3060 Bytes #999 (0) @ WW
BID : 18842-TI0PAQ
Read: GUEST
Subj: FORMLESS SEISMIC ACTIVITY
Path: IZ3LSV<IK2XDE<DB0RES<WA7V<CX2SA<HR1FBB<TI0PAQ
Sent: 090109/0616Z 18842@TI0PAQ.SJO.CRI.CEAM [San Jose] WFBB7.00i $:18842-TI0PA
From: TI2WMP@TI0PAQ.SJO.CRI.CEAM
To : ALL@WW
7 - 8 JANUARY OF 2009
January 08 2009
Today 8 of January of 2009 at 1:21 in the afternoon it happened an earthquake in the Mountain
range Volcanic Power station of Costa Rica whose epicentre 6 km was located to the east of the
Volcßn Poßs. This earthquake this associated to a flaw of lateral landslide.
The flaws in the volcanic mountain range are associated to wedges or blocks that exist among the
volcanic strata, product that the subduction of the badge of the Coconut is not perpendicular to the
badge Caribbean. The magnitudes of the earthquakes in the volcanic arch and the front of the
volcanic arch depend on the distance among those the tectonic blocks that it conforms the bark
among the volcanos.
It is not very probable that this fallamiento type causes an increase of volcanic activity in the Poßs,
given the type of fallamiento of lateral landslide, although the normal degasificación (activity
fumarólica) it can continue with some variations of intensity.
In the case of the Poßs, the OVSICORI has picked up information of materials and uncertainty of
walls in the epicentral area, product of the earthquakes of the 7 and 8 of January. Increase of
volcanic activity has not been verified in the volcano Poßs, except for the report of an increase in the
size of the fumaroles of the main crater, fair after the event of the day 7 of January 2009, to the
10:00 am.
It is natural, due to the high humidity that the floors of the volcanic Mountain range maintain, to the
strong slopes and the unstable floors that slips take place in an important radius to the epicentral
area.
Of the studies that have been made in the volcanic chain of Central America we have that alone 1%
of this type of earthquakes has affected the volcanos producing volcanic eruptions.
The main earthquake has caused slips in the epicentral area with fall of objects, houses collapsed
mainly in broken lands or in hillsides, a bridge in collapsed construction, access road closed by
slips, lacks to visit villages since in the epicentral area there is not access on the part of the
organisms of emergency of Costa Rica. With the level of damages evaluated in form preliminary,
she/he has registered a maximum intensity of VIII in the epicentral area (region of Varablanca–
Cariblanco). The intensity registered by the scale of Mercalli evaluates the effects of the earthquake
in different towns, for what varies from place to place, depending on the effects registered in each
one of those places.
The earthquake that happened yesterday 7 of January to the 10:00 am is an earthquake premonitor
from today's 8 of January main earthquake to the 1:21 pm and one had reported 60 happened
earthquakes yesterday's day.
2
After the main earthquake of January 8, we have registered 1300 replicas until the 5:00 pm for the
OVSICORI with earthquakes of moderate magnitudes between the 3 degrees and 4.5 degrees and
the replicas they will continue at the moment.
Info www.ovsicori.una.ac.cr TI2WMP waldyn Murillo Perez........
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