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MACROSEISMIC INTENSITY ATTENUATION LAWS FOR LARGE VRANCEA(ROMANIA) INTERMEDIATE EARTHQUAKES
Abstract
The macroseismic intensity attenuation and its variation as a function of the epicentral or hypocentral distance is one of the issues in the seismic hazard assessment and of shake map generation. This output is especially required by emergency situation inspectorates or by the insurance companies. The macroseismic intensity investigations are carried out in Romania after all earthquakes with magnitudes larger than 4.0. Starting with 2014 the classical method for macroseismic information collection was doubled by the online method, consisting in online questionnaires and rapid feedback based on pictograms. In the current study the ground-motion prediction equations were computed in terms of macroseismic intensity for Romania, using the large Mw>6.5 intermediate depth Vrancea earthquakes and were tested on the recent moderate events to certify their validity at lower ranges of magnitudes. The mathematical relation proposed by von Koveslighety in 1906 was used for analysing the attenuation of seismic intensity with distance in terms of the difference between the maximum observed intensity, referred here as epicentral intensity Io and site intensity I, for 24 different azimuths. The macroseismic catalogue used in the present study comprises 7461 intensity data points (IDP) for 5 large Vrancea (Romania) intermediate depth earthquakes (10th November 1940. 4th March 1977, 30th August 1986, 30th and 31st May 1990), 471 IDP?s for the moderate 27th October 2004 earthquake and 3048 IDP?s for nine intermediate depth moderate earthquakes (4.1<Mw<6.0) occurred in the last 4 years, obtained from more than 10.000 answers to questionnaires. Comparison to already existing intensity attenuation equations for Vrancea region (intermediate earthquakes) shows that the proposed relation provides better estimates of the macroseismic intensity distribution than other equations.
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