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Did the Makarska earthquake of 1962 generate a tsunami in the central Adriatic archipelago?


Herak, Marijan; Orlić, Mirko; Kunovec-Varga, Mario
Did the Makarska earthquake of 1962 generate a tsunami in the central Adriatic archipelago? // Journal of Geodynamics, 31 (2001), 1; 71-86 (međunarodna recenzija, članak, znanstveni)


Naslov
Did the Makarska earthquake of 1962 generate a tsunami in the central Adriatic archipelago?
(Did the Makarska earthquake of 1962 generate a tsunami in the central Adriatic achipelago?)

Autori
Herak, Marijan ; Orlić, Mirko ; Kunovec-Varga, Mario

Izvornik
Journal of Geodynamics (0264-3707) 31 (2001), 1; 71-86

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Makarska earthquake; tsunami

Sažetak
The Makarska earthquakes of 1962 represent one of the most important seismic sequences in Croatia in the last 50 years. The mainshock (ML = 6.1) occurred in the area between the mainland and the islands of Hvar and Brač. Fault plane solutions for the three largest events indicate reverse faulting on a steeply dipping, WNW-ESE striking fault, which also agrees with the position of the relocated hypocentres. The dip-slip component of the motion on the fault was large enough to cause maximum vertical sea-bottom displac-ement of about 15 cm, which in turn could have generated a small tsunami. The horizontal dimensions of the source area are estimated by empirical formulas to be of the order of 10 km. As the bottom depth in the area ranges between 10 and 100 m, a linear shallow-water model may be used to simulate the tsunami. The model equations have been solved using a finite-difference numerical scheme (resolution 500 m/10 s). The modelled tsunami reveals some interesting features: short waves are detained in the source area, probably due to scattering caused by the irregularities of the coastline; long waves propagate outwards, through the Brač, Hvar and Neretva Channels; and the tsunami is somewhat amplified near the coasts, primarily as a result of refraction. The simulated tsunami is compared to the corresponding tide-gauge record from Split. The observed arrival time and amplitudes agree well with those of the synthetic tsunami, if it is assumed that initial disturbance was due to the subsidence of the foot wall of the seismo-genetic fault - in agreement with tectonic motions in the area.

Izvorni jezik
Engleski

Znanstvena područja
Geologija



POVEZANOST RADA


Projekt / tema
119298
119299

Ustanove
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus