The size of the area affected by earthquake induced rockfalls: Comparison of the 1998 Krn Mountains (NW Slovenia) earthquake (M<sub>w</sub> 5.6) with worldwide data

Andrej Gosar

doi:10.3986/AGS.4845

Avtorji

Andrej Gosar Slovenian Environment Agency Seismology and Geology Office Vojkova 1b, SI-1000 Ljubljana, Slovenia and University of Ljubljana Faculty of Natural Sciences and Engineering Aškerčeva 12, SI-1000 Ljubljana, Slovenia

DOI:

https://doi.org/10.3986/AGS.4845

Ključne besede:

učinki potresa, intenziteta, skalni podor, makroseizmične raziskave, lestvica Environmental Seismic Intensity, Krnsko pogorje, Slovenija

Povzetek

Potres leta 1998 v Krnskem pogorju z M_w5,6 je imel obsežne učinke v naravnem okolju, med katerimi so prevladovali skalni podori. Vse podore smo raziskali z namenom ocene velikosti celotnega območja pojavljanja. Ugotovili smo 80km2 veliko območje (r=7.6km) in ga primerjali z dvema svetovnima zbirkama podatkov. Celotno prizadeto območje ob Krnskem potresu je znatno manjše od zgornje meje pojavljanja ugotovljene za obe zbirki. Enako velja za bližnji potres leta 1976 v Furlaniji z M_w6,4, pri katerem je bila velikost prizadetega območja 2050km2. Po drugi strani pa je primerjava z ESI 2007 pokazala, da je celotno prizadeto območje ob potresu leta 1998 z I_maxVII–VIII izrazito večje od opredelitve v tej letvici in manjše za potres leta 1976 z I_maxX. Te razlike ni mogoče pojasniti z razliko v globini žarišča ali razliko v žariščnem mehanizmu obeh potresov. Rezultati te študije so pomembni za ocenjevanje potresne nevarnosti in za razumevanje učinkov na okolje pri srednje močnih potresih v goratih območjih.

Prenosi

Podatki o prenosih še niso na voljo.

Literatura

Ambraseys, N. N. 1976: The Gemona di Friuli earthquake of 6 May 1976 UNESCO Technical Report RP 1975-76. Paris.

ARSO 2017: Database of earthquake induced rockfalls in Krn Mountains. Ljubljana

Aoudia, A., Sarao', A., Bukchin, B., Suhadolc, P. 2000: The Friuli 1976 event: a reappraisal 23 years later. Geophysical Research Letters 27-4. DOI: https://doi.org/10.1029/1999GL011071

Bajc, J., Aoudia, A., Sarao, A., Suhadolc, P. 2001: The 1998 Bovec-Krn mountain (Slovenia) earthquake sequence. Geophysical Research Letters 28-9. DOI: https://doi.org/10.1029/2000GL011973

Carulli, G. B., Slejko, D. 2005: The 1976 (NE Italy) earthquake. Giornale di Geologia Applicata 1. DOI: https://doi.org/10.1474/GGA.2005-01.0-15.0015

Console, R. 1976: Focal mechanism of some Frioul earthquakes (1976). Bollettino di Geofisica Teorica ed Applicata 19.

Delgado, J., Palaez, J. A., Tomas, R., Garcia-Tortosa, F. J., Alfaro, P., Lopez-Casado, C. 2011: Seismically-induced landslides in the Betic Cordillera (S Spain). Soil Dynamics and Earthquake Engineering 31-9. DOI: https://doi.org/10.1016/j.soildyn.2011.04.008

Delgado, J., Garcia-Tortosa, F. J., Garrido, J., Loffredo, A., Lopez-Casado, C., Martin-Rojas, I., Rodriguez, M. J. 2015: Seismically-induced landslides by low-magnitude earthquake: The Mw 4.7 Ossa De Montiel event (central Spain). Engineering Geology 196. DOI: https://doi.org/10.1016/j.enggeo.2015.07.016

Giorgetti, F. 1976: Isoseismal map of the May 6, 1976 Friuli earthquake. Bollettino di Geofisica Teorica ed Applicata 19.

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: https://doi.org/10.1016/j.enggeo.2007.01.008

Gosar, A. 2012: Application of Environmental Seismic Intensity scale (ESI 2007) to Krn Mountains 1998 Mw=5.6 earthquake (NW Slovenia) with emphasis on rockfalls. Natural Hazards and Earth System Sciences 12-5. DOI: https://doi.org/10.5194/nhess-12-1659-2012

Govi, M. 1977: Photo-interpretation and mapping of the landslides triggered by the Friuli earthquake (1976). Bulletin of the International Association of Engineering Geology 15-1.

Govi, M., Sorzana P. F. 1977: Effetti geologici del terremoto: frane. Rivista Italiana di Paleontologia e Stratigrafia 83.

Grünthal, G. 1998: European Macroseismic Scale 1998. Luxemburg.

Guerrieri, L., Vittori, E. 2007: Intensity scale ESI 2007. Memorie Descritive della Carta Geologica d'Italia 74. Rome.

GURS 2017: Digital elevation model of Slovenia – 5 m resolution. Surveying and Mapping Authority of Slovenia. Ljubljana.

Keefer, D. K. 1984: Landslides caused by earthquakes. Geological Society of America Bulletin 95. DOI: https://doi.org/10.1130/0016-7606(1984)95%3C406:LCBE%3E2.0.CO;2

Komac, B., Zorn, M., Kušar, D. 2012: New possibilities for assessing the damage caused by natural disasters in Slovenia - The case of the real estate record. Geografski vestnik 84-1.

Komac, B. 2015: Modeliranje obpotresnih pobočnih procesov v Sloveniji. Geografski vestnik 87-1. DOI: https://doi.org/10.3986/GV87107

Komac, B., Zorn, M. 2016: Naravne in umetne pregrade ter z njimi povezani hidro-geomorfni procesi. Geografski vestnik 88-2. DOI: https://doi.org/10.3986/GV88204

Papanikolaou, I. D. 2011: Uncertainty in intensity assignment and attenuation relationships: How seismic hazard maps can benefit from the implementation of the Environmental Seismic Intensity scale (ESI 2007). Quaternary International 242-1. DOI: https://doi.org/10.1016/j.quaint.2011.03.058

Reiter, L. 1990: Earthquake hazard analysis. New York.

Rodriguez, C. E., Boomer, J. J., Chandler, R. J. 1999: Earthquake-induced landslides: 1980-1997. Soil Dynamics and Earthquake Engineering 18. DOI: https://doi.org/10.1016/S0267-7261(99)00012-3

Vidrih, R., Ribičič, M. 1998: Slope failure effects in rocks at earthquake in Posočje on April, 12 1998 and European Macroseismic Scale (EMS-98). Geologija 41. DOI: https://doi.org/10.5474/geologija.1998.019

Vidrih, R., Ribičič, M., Suhadolc, P. 2001: Seismogeological effects on rocks during 12 April 1998 upper Soča Territory earthquake (NW Slovenia). Tectonophysics 330. DOI: https://doi.org/10.1016/S0040-1951(00)00219-5

Vidrih, R. 2008: Seismic activity of the upper Posočje area. Ljubljana.

Zorn, M. 2002: Rockfalls in Slovene Alps. Acta Geographica Slovenica 17.

Zupančič, P., Cecić, I., Gosar, A., Placer, L., Poljak, M., Živčić, M. 2001: The earthquake of 12 April 1998 in the Krn Mountains (Upper Soča valley, Slovenia) and its seismotectonic characteristics. Geologija 44-1. DOI: https://doi.org/10.5474/geologija.2001.012