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Seismicity
of B&H - historical Summary |
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The beginning of
modern seismological investigation of the territory of B&H dated
from relatively old time. On January 1, 1905 in Sarajevo, during
Austro-Hungarian rule, on the Grdonj hill, in a special building,
which exists even today, the first seismograph was established and
begun to work (the vertical component). In the subsequent years
two new seismographs were added (horizontal components). So, at
the beginning of the 20 century Sarajevo had the most modern seismological
service in Europe for that age.
Based
on that instrumental data it was founded that, on the territory
of B&H, almost every day there are, in average, three earthquakes.
Theirs intensity is less than II degrees of Mercally scale and they
are recorded only by instruments. The stronger earthquakes are rarely.
The hypocentral depth of these earthquakes is from 4 to 30 km. Every
year there are about ten stronger earthquakes (in average) which
could be felt or which could cause damage on buildings. From the
year 1905 on this area the instruments recorded 1161 earthquakes
with magnitude greater than 4.0, or with intensity more than VI
degrees of Mercally scale, i.e. those were earthquakes which caused
damage or killed people.
Mechanical seismograph Mainka type (Z-component)
from 1905
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| By collecting of historical
data of earthquakes, which were found in Istanbul, Venice, Budapest,
Vienna and Dubrovnik the catalogue of historical earthquakes for the
territory of B&H was made (to the year of 1900). Also, using instrumental
data, usually from the seismographs in B&H, the catalogue of the
earthquakes from the year 1900 till today, was made. This catalogue
is not finished because there are new data almost every day. |
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Record of Earthquake from San Francisko (April
18 1906) |
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