ARSF - Flight MC04/09: Slovenia - Idrija and Ravne Faults
ARSF project MC04/09: LiDAR Mapping of Seismogenic Faults in NW Slovenia. PI: Dickson Cunningham. Site: Idrija and Ravne.
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LiDAR has been demonstrated to be an excellent mapping tool for identifying faults in forested terrain that pose a potential earthquake hazard. As part of an ongoing geophysical and geological investigation into earthquake hazards in Slovenia and the southeastern Alps region, we propose a LiDAR survey along two major fault systems in NW Slovenia to better document their geometry and recent activity. The Ravne Fault ruptured in 1998 (M=5.6) causing local landsliding and extensive damage and appears to be an active propagating fault, although its exact trace, length, and linkage with other faults is uncertain. The Idrija Fault forms a major topographic lineament and is believed to have ruptured in 1511 producing the largest historical earthquake (M=6.8) in the region. Both faults are believed to pose a major seismic hazard to large cities in the region where over 5 million people live including Trieste, Udine, Ljubljana, Villach, Klagenfurt, Rijeka, and Zagreb. LiDAR data should reveal the locations of paleaoseismic surface rupturing which will allow geologists to trench the sites, date previous events and most importantly, establish the earthquake recurrence interval.
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