catalogo de terremotos para america del sur catalog of earthquakes ...

5. PLANS AND FUTURE WORK
138
As was pointed out at the beginning, the present Catalog which are a result
of the work carried out during the first stage of project SISRA, can be
neither compieted or perfect because of the goals that were established and
the nature of the work itself. It is a preliminary preseptation to show with
a homogeneous model., thC e:xisting seismic material in the participating countries
This does not mean that the results obtained are not of great value
and importance; the elffort invested in the catalog is of exceptional merit
and the new data found duplicated the information which existed. However
there is much important work that vet needs to be done. In the first place
it is neces cyav to ip date the (;ata]log continuously by processing the data
diaily. )n t he other hand the data :ind results obtained are not definitive; it
has not been possibe to ohtain and revise all of the sources for the events
which have occurrdc( in Cotolmbia and until this is done the data and reslts
can st:ili ce modified and perhaps augmented. Furthermore, there are always
some caseb without due analysis because the results are contradictory. there
is much to be done in the preparation of maps with isoseismal cu rves, since
those preppnred have been relatively 'ew and with new information many others
could be prepa red. All of this will improve the investigation and study of
the s.'im-;ic at.tenuation and other elements related with the relation between
seis.,ic ac'tivity and geological fau]ts which either produce earthquakes or are
evidencu of their effects. Without data it is not possible to determine the
seismic hazard and risk of the different regions of the country, which is the
final objective of the catalog.
It is necessary to start studying other seismic parameters of great interest
such as the determination of the seismic moment of he most important
earthquakes and their focal mechanism. This can not be done in a limited period
of time aind it has to le a matter of a new project and new programs t'hich
require a long-term effort and considerable economic support.
AI) TIONA!, !',EF'RE.;CES:
See page 40.