HEADING PAGE - port of ploce authority * welcome

ENVIRONMENTAL IMPACT STUDY
Rn: 03-033 CONTAINER TERMINAL PLOCE PAGE: 50
A.3.4.3.3. SEISMIC CHARACTERISTICS
The river delta territory is seismically active. It is shown ba the density of
earthquake epicenters, their frequency as well as the magnitude size of
seismic impacts. The cause of elevated seismic activity is the the Adriatic slab
slipping under the Dinarides, i.e. under the High Karst zone. The contact
between those zones is characterized by seicmically very active Biokovodubrovacka
fracture zone, stretching through the river Neretva delta as well.
In the last 50 years, in 1942. and 1961. this area was struck by earthquakes of
7 to 8 0 magnitute on the MCS scale, causing greater material damage on
buildings.
According to the valid data, the basic seismic intensity on the river Neretva
delta is of 8 0 of the MCS scale. The expected intensities with 63% probability
of occurrence are: 6 0 MSK-64 for the 50 year return period, 7 0 MSK-64 for
100 and 200 year return period and 8 0 MSK-64 for 500 year return period.
According to the ground seismic stability analyses in the river Neretva delta
zone since 1986, the maximum magnitude can be M = 6.1, while the basic
seismicity degree Imax = 9.15 of MCS scale. The same analyses have shown
the psosibility of liquefaction in the mud and sand sediments of the delta.
A.3.4.3.4. GEOMECHANICAL INFORMATION
According to the information from the geotechnical study by the IGH, the
Institute of Geotechnics, the area where the Ploce Port is located lies on the
wide delta of the river Neretva. Therefore, this territory is formed mainly of
sediment formations from the Quarternary age which in form of thick
formations are accumulated over the karst paleorelief. On the area foreseen
for container terminal and Quay 7 construction, the thickness of Quarternary
formations exceeds 100 m. sediment formations are of very different grain
size content and are often intermixed. According to the research studies
performed in 1989, for the phase I of the container terminal construction in the
Quay 7 background, the following types of ground were established:
From elevation 0 to elevation –20 mud and sand material
From elevation –20 to elevation –35 clayley materials
From elevation –35 to elevation –42 sand
From elevation –42 to elevation –52 gravel
These research studies were elaborated in the text: Study on Engineering
Geological and Geotechnical Ground Characteristics and Requirements for
the Object Funding for the First Phase of Container Terminal in the «Ploce
Port» in Kardeljevo, Institute for Geotechnics and Funding of the Faculty of
Civil Engineering in Sarajevo, Reference number D-1815, Sarajevo, I/1990
(cited from the quote in the Geotechnical Study of the IGH, project number
Rn-03-033-04-IR-03).
According to these information, the ground where the container terminal shall
be built is of extremely low carrying capacity and is subject to subsidence. In
the geotechnical study for the preliminary design, the terms of construction
and ground consolidation with gravel piles were determined, in order that
foreseen loads from the container terminal could be taken over.
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