1.        Kuzmić, M. (1993): A satellite observation of the Adriatic Sea response to a spatially heterogeneous wind. Geofizika, 10, 1-18.  

 

ABSTRACT:

 

       Coastal Zone Color Scanner (CZCS) derived fields of pigment concentration were used in this paper to assess the Adriatic Sea response to a spatially heterogeneous wind. By observing changes in the pigment fields of the Northern Adriatic surface waters further evidence was sought for previously studied effect of bora, a gusty katabatic wind of north-easterly direction. CZCS registered similarities and differences in response to three bora episodes were analyzed using available wind and Po River discharge data and a mathematical model prediction of the wind-induced circulation. In comparing the modeling results with spaceborne observations the bora-induced gyre emerged as the mechanism responsible for particular change of spatial pattern observed in CZCS detected radiance and derived pigment concentration filed. In this process relative timing of bora episodes and availability of Po-supplied tracing material seem to be important.  

 

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2.        Markušić, S., D. Herak, I. Sović and M. Herak (1993): Seismicity of Croatia in the period 1990-1992. Geofizika, 10, 19-34.

 

ABSTRACT:

 

       Based on the catalogue of all located earthquakes in Croatia and the surrounding areas for the period 1990 – 1992 and on the macroseismic data analyses for individual earthquakes, certain seismicity features have been analysed. All together, 1188 earthquakes were located and the catalogue was found to be complete for the magnitudes M_L ≥ 3.0. Seismically the most active was the coastal part of Croatia, where the strongest earthquake in the analysed period occurred on November 27, 1990 with the epicentre beneath the Dinara Mt. The composite fault-plane solution for the main shocks indicate the presence of a tectonic stress-filed directly approximately SSW-NNE which is compatible with the assumed anticlockwise rotation of the Adriatic plate and its subduction under the Dinarides.    

 

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3.        Stillitani, E., A. Bottari, A. Teramo and M. Pietrafesa (1993): Application of Sponheuer and Blake models in the seismic hazard evaluation: The case of Messina Straits. Geofizika, 10, 35-46.

 

ABSTRACT:

 

       Attenuation is fundamental in the description of a seismic event, determining the spatial distribution of intensity associated with it. Knowing the influence of the attenuation coefficients on the values of the maximum expected intensity for North-Eastern Sicily, the necessity arises to quantify the “weight” of the attenuation models and of the respective coefficients on the intensity estimates.

       The first evaluation is presented here using the Sponheuer and Blake models. The comparison of the maps of expected intensity, obtained from the cross-use of the laws allows the first critical estimate, showing the greater adaptability of the Sponheuer model to describe the attenuation of intensity for the investigated area.

 

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4.        Sović, I. (1993): Interferometer as seismometer displacement transducer. Geofizika, 10, 47-59. (in Croatian)

 

ABSTRACT:

 

       Displacements of the pendulum of S-13 Teledyne Geotech seismometer were measured using a small Michelson interferometer. The oscillations of the pendulum were simultaneously recorded by the PDAS-100 digital seismograph. These records were integrated and compared with those made by the interferometer. The pendulum was simulated by sine (0.5, 1 and 2 Hz) and random signals. Michelson interferometer was simplified by using the cube beam splitter with mirror film deposited onto one of its faces. The source of radiation was thermally stabilised collimated laser diode (LD) driven with constant current. Wavelength of LD was 670 nm. Fringes were counted with 16-bit presentable up/down CMOS counter. Counter state was sampled by Atari ST 1040 computer with sampling frequency equal to 33.4 Hz. Resolution of the transducer was 335 nm. The transducer would be able to record oscillations of the pendulum caused by an earthquake with magnitudes between 1.1 and 5.2 at epicentral distance of 0.1°, and could therefore find the application in a displacement strong-motion seismograph. 

 

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5.        Herak, M. and M. Jukić (1993): Fault plane solution for the earthquake of 25 November 1986 near Knin, Croatia. Geofizika, 10, 61-68.

 

ABSTRACT:

 

       By analyzing the P-wave first motion polarities we have obtained the fault plane solution for the Knin earthquake of 25 November 1986. The fault plane/auxiliary plane ambiguity was resolved by comparing the solutions to the known geological features of the area. We were able to obtain practically the same result by modeling the first 10 s of the P-wave as recorded on the broad-band instrument at GRF, thus confirming the relatively poorly constrained classical solution parameters. The earthquake has probably occurred on the northern section of the NW-SE striking right lateral reverse Knin fault. The pressure axis corresponding to the fault plane solution does not lie in the direction of the regional compressional stress filed as reported by others, thus indicating strong deformation of the local stresses that is probably the result of interaction of numerous block structures present in that area.

 

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