Temporal, Spatial and Physical Charactersitics of Seismicity
Main researcher
: SKOKO, DRAGUTIN (43564) Assistants
ALLEGRETTI, IVO (106520)
HERAK, DAVORKA (81783)
MILOŠEVIĆ, ANĐELKA (31704)
MARIĆ, KREŠIMIR (28343)
HERAK, MARIJAN (113753)
KUK, VLADO (76282)
MARKUŠIĆ, SNJEŽANA (164886)
SOVIĆ, IVICA (121392)
JUKIĆ, MLADEN (900553)
Type of research: basic Duration from: 01/01/91. to 12/31/96. Papers on project (total): 46
Papers on project quoted in Current Contents: 7
Institution name: Prirodoslovno-matematički fakultet, Prirodoslovni odjeli, Zagreb (119) Department/Institute: Department of Geophysics and Meteorology, Geophysical Institute A. Mohorovičić Address: Horvatovac bb City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)41 420 222
Fax: 385 (0)41 426 233
E-mail: seiszag@olimp.irb.hr
Summary: The main results obtained are:
- The knowledge of the seismicity of Croatia has been greatly improved by
detailed analyses of recent as well as hystorical earthquakes. The most
important result is the new and revised Catalog of earthquakes in Croatia.
- New and more reliable magnitude relations were derived for the local as
well as for the teleseismic events.
- Quasisimultaneous inversion was applied to estimate the models of the
Earth's crust and upper mantle in Croatia and adjacent regions, and to
improve the locations of earthquakes in that area.
- A prototype of the laser interferometer transducer for ground
displacement was constructed.
- By the analysis of coda waves, the attenuation properties of rocks in the
Dinarides region were estimated.
Research goals: Immediate objective of the investigations is the
knowledge of the physical processes of the seismic generation in the
Earth's crust in order to define the seismic hazard and specific seismic
prediction parameters which will contribute to new achievements and will
enable international scientific cooperation. The ultimate aim of the
investigations is the satisfactory estimation of the place, intensity and
time of an earthquake including the definition of the spatial and temporal
seismic energy boundaries in order to attain more realistic planning and
building in seismic areas. High quality seismic recording system adapted
to the computer technology is expected. Numeruous seismogrammes from the
earlier period (1908-1982) will be adequately reduced. Out of many
expressions and procedures for earthquake magnitude determination, the
acceptible ones will be selected and modified in accordance with the
theoretical requirements. Seismic models of the Earth's crust and upper
mantle will be modified by introducing the new parameters (lateral
inhomogenity, velocity of Pg, Pb, Pn, Sg, Sb, Sn waves, Mohorovičić
discontinuity inclination) which will result in better accuracy of
earthquake location. Seismic characteristics (focal mechanism, maximum
earthquake, activity) are being correlated analytically with corresponding
geologic parameters, which results in better input parameters for
engineering purposes. Various seismic hazard models (focal mechanism,
attenuation functions, project earthquakes) require their continuous
testing and modifying within their broad limits.
COOPERATION - PROJECTS
Name of project
: Regional and global seismicity -
interpretation of hystorical seismograms Name of institution: University of Hamburg, Geophysical institute City: 20146 - Hamburg, Njemačka
Name of project
: Quantification of Earthquakes Name of institution: University of Hamburg, Gophysical Institute City: 20146 - Hamburg, Njemačka
Name of project
: Analysis of macroseismic data in SE Europe Name of institution: University of Southern California, School of
Engineering City: Los Angeles, SAD
OTHER ACHIEVEMENTS
Name
: Prototip laserskog interferometarskog pretvornika
relativnog pomaka Type of achievement: Prototypes Authors: Sović Ivica, Herak Marijan Other information about the project.