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Title: MACROSEISMIC INTENSITY ATTENUATION LAWS FOR LARGE VRANCEA(ROMANIA) INTERMEDIATE EARTHQUAKES
MACROSEISMIC INTENSITY ATTENUATION LAWS FOR LARGE VRANCEA(ROMANIA) INTERMEDIATE EARTHQUAKES

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I.A. Moldovan;A. P. Constantin;E. F. Manea;R. Partheniu;E. G. Constantinescu
10.5593/sgem2019/1.1/S05.107
1314-2704
978-619-7408-76-8
English
19
1.1
Applied and Environmental Geophysics
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.
conference
https://www.sgem.org/index.php/jresearch-article?citekey=Moldovan20195865872
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19th International Multidisciplinary Scientific GeoConference SGEM 2019
19th International Multidisciplinary Scientific GeoConference SGEM 2019, 30 June - 6 July, 2019
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference-SGEM
Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
865-872
30 June - 6 July, 2019
website
cdrom
4879
Attenuation; macroseismic intensity; intermediate-depth; earthquakes