Macroseismic investigations of the geological site effects on intensities of selected earthquakes in greater Ljubljana area

Authors

  • Anita Jerše AGENCIJA RS ZA OKOLJE URAD ZA SEIZMOLOGIJO IN GEOLOGIJO
  • Mladen Živčić AGENCIJA RS ZA OKOLJE URAD ZA SEIZMOLOGIJO IN GEOLOGIJO
  • Andrej Gosar AGENCIJA RS ZA OKOLJE URAD ZA SEIZMOLOGIJO IN GEOLOGIJO

DOI:

https://doi.org/10.3986/AGS.793

Keywords:

European Macroseismic Scale, intensity, macroseismic investigations, Eurocode 8, seismic microzonation, Ljubljana basin

Abstract

Ljubljana is one of three regions with the highest seismic hazard in Slovenia. In addition soft sediments in the Ljubljana basin have a strong influence on seismic ground motion. We used macroseismic data to investigate the influence of local geological structure on earthquake intensities in greater Ljubljana area. We determined intensities for eleven earthquakes according to ground classification based on Eurocode 8 standard (EC8). The results showed a systematic increase in observed seismic intensities, determined according to European Macroseismic Scale (EMS-98), as the seismogeological characteristics of the ground deteriorated. Only one ground type (D) showed slightly lower intensities than expected. This may be due to some unrevealed geological and other factors, or because of very limited macroseismic data available for this particular ground type.

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References

Bradley, B. A. 2012: Ground motions observed in the Darfield and Christchurch earthquakes and the importance of local site response effects. New Zealand journal of geology and geophysics 55-3. DOI: http://dx.doi.org/10.1080/00288306.2012.674049

Buser, S. 1969: Osnovna geološka karta SFRJ 1:100.000, list Ribnica. Beograd.

Buser, S., Grad, K., Pleničar, M. 1967: Osnovna geološka karta SFRJ 1:100.000, list Postojna. Beograd.

Cecić, I. 2004: Metodologija prikupljanja i obrade makroseizmičkih podataka. Magistrsko delo, Fakulteta za znanost Univerze v Zagrebu. Zagreb.

Cifelli, F., Donati, S., Funiciello, F., Tertulliani, A. 2000: High–density macroseismic survey in urban areas. Part 2: Results for the city of Rome, Italy. Bulletin of the Seismological society of America 90-2. DOI: http://dx.doi.org/10.1785/0119990097

Elder, D. McG., Mccahon, I. F., Yetton, M. D. 1991: The earthquake hazard in Christchurch: a detailed evaluation. Christchurch.

Giammarinaro, M. S., Tertulliani, A., Galli, G. 2005: Investigation of surface geology and intensity variability in the Palermo, Italy, urban area after the 6 September 2002 earthquake. Bulletin of the Seismological society of America 95-6. DOI: http://dx.doi.org/10.1785/0120040214

Gosar, A. 2007: Microtremor HVSR study for assessing site effects in the Bovec basin (NW Slovenia) related to 1998 Mw5.6 and 2004 Mw5.2 earthquakes. Engineering geology 91, 2-4. DOI: http://dx.doi.org/10.1016/j.enggeo.2007.01.008

Gosar, A. 2010: Site effects and soil–structure resonance study in the Kobarid basin (NW Slovenia) using microtremors. Natural hazards and earth system sciences 10-4. DOI: http://dx.doi.org/10.5194/nhess–10–761–2010

Grad, K., Ferjančič, L. 1968: Osnovna geološka karta SFRJ 1:100.000, tolmač lista Kranj. Zvezni geološki zavod. Beograd.

Grünthal, G. 1998: European macroseismic scale 1998. Cahiers du Centre Europѐen de gѐodynamique et de seismologie 15.

Lapajne, J., Šket Motnikar, B., Zupančič, P. 2001: Karta potresne nevarnosti Slovenije – projektni pospešek tal in tolmač. Ljubljana.

Maugeri, M., Massimino, M. R., Grasso, S. 2013: The 2012 Emilia–Romagna earthquake (Italy): lesson and mitigation measurements. 18th International conference on soil mechanics and geotechnical engineering. Paris.

Michetti, A. M., Esposito, E., Guerrieri, L., Porfido, S., Serva, L., Tatevossian, R., Vittori, E., Audemard, F., Azuma, T., Clague, J., Comerci, V., Gürpinar, A., McCalpin, J., Mohammadioun, B., Mörner, N.A., Ota, Y. and Roghozin, E. 2007: Environmental seismic intensity scale 2007—ESI 2007, Memorie descrittive della Carta geologica d’Italia 74. Roma.

Pleničar, M. 1963: Osnovna geološka karta SFRJ 1:100.000, tolmač lista Postojna. Beograd.

Potresi – vprašalnik, 2014. Internet: http://www.arso.gov.si/potresi/vpra%C5%A1alnik/ (10. 11. 2014).

Premru, U. 1983: Osnovna geološka karta SFRJ 1:100.000, list Ljubljana. Beograd.

Premru, U. 1980: Osnovna geološka karta SFRJ 1:100.000, tolmač lista Ljubljana. Beograd.

Sbarra, P., De Rubies. V., Di Luzio, E., Mancini, M., Moscatelli, M., Stigliano, F., Tosi, P., Vallone, R. 2012: Macroseismic effects highlight site response in Rome and its geological signature. Natural hazards 62-2. DOI: http://dx.doi.org/10.1007/s11069–012–0085–9

SIST EN 1998–1, 2005: Evrokod 8 – Projektiranje potresnoodpornih konstrukcij 1, Splošna pravila, potresni vplivi in pravila za stavbe, slovenski standard. Ljubljana.

SIST EN 1998–1/A101, 2005: Evrokod 8 – Projektiranje potresnoodpornih konstrukcij 1, Splošna pravila, potresni vplivi in pravila za stavbe – Nacionalni dodatek. Ljubljana.

SPSS Inc. 1999: SPSS Base 9.0 applications guide.

Toshinawa, T., Taber, J. J., Berill, J. B. 1997: Distribution of ground–motion intensity inferred from questionnaire survey, earthquake recordings, and microtremor measurments – a case study in Christchurch, New Zealand, during the 1994 Arthurs pass earhquake. Bulletin of the Seismological society of America 87-2.

Zupančič, P., Šket Motnikar, B., Gosar, A., Prosen, T. 2004: Karta potresne mikrorajonizacije Mestne občine Ljubljana. Potresi v letu 2002. Ljubljana.

Zupančič, P. 2013: Mikrorajonizacija območij v Sloveniji z večjo potresno nevarnostjo. Potresi v letu 2012. Ljubljana.

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Published

06-07-2015

How to Cite

Jerše, A., Živčić, M., Gosar, A. 2015: Macroseismic investigations of the geological site effects on intensities of selected earthquakes in greater Ljubljana area. Acta geographica Slovenica 55-1. https://doi.org/10.3986/AGS.793