Number of the records: 1
Three large prehistoric earthquakes in the Eastern Alps evidenced by cave rupture and speleothem damage
- 1.
SYSNO ASEP 0557129 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Three large prehistoric earthquakes in the Eastern Alps evidenced by cave rupture and speleothem damage Author(s) Baroň, Ivo (USMH-B) ORCID, SAI
Plan, L. (AT)
Grasemann, B. (AT)
Melichar, R. (CZ)
Mitrović-Woodell, I. (AT)
Rowberry, Matthew David (USMH-B) RID, ORCID, SAI
Scholz, D. (DE)Number of authors 7 Article number 108242 Source Title Geomorphology. - : Elsevier - ISSN 0169-555X
Roč. 408, 1 July (2022)Number of pages 17 s. Language eng - English Country NL - Netherlands Keywords paleoearthquake ; speleotectonics ; speleoseismology ; karst caves ; active faults ; speleothems ; Eastern Alps Subject RIV DB - Geology ; Mineralogy OECD category Geology R&D Projects GC22-24206J GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support USMH-B - RVO:67985891 UT WOS 000800209900002 EID SCOPUS 85127508865 DOI 10.1016/j.geomorph.2022.108242 Annotation Spectacular geomorphic evidence of recent tectonic activity and three potentially strong prehistoric earthquakes were discovered in Obir Caves in the Karawanken Mountains. This paper presents active fault structures, geomorphic features, and the age constraints attributed to particular seismotectonic events. The 1976 Mw 6.7 Friuli earthquake about 100 km from Obir Caves caused only local speleothem damage. The 100 km hypocentral distance enabled attenuation of the seismic waves so speleothem damage due to stalagmite resonance frequency was dampened. The documented dripstone column damage was rather caused by its sudden shortening due to passing elastic S-waves with estimated 3.5 (+8.2/−1.5) mm PGD amplitudes. At least three distinct seismotectonic events in the Late Pleistocene and Early to Middle Holocene were constrained by radiometric dating. The 40.6 cm sinistral fault slip occurred between 41.8 ± 1.3 ka and 18.7 ± 0.4 ka ago, the 2.6 cm dextral oblique reverse fault slip happened between 10.73 ± 0.23 and 8.61 ± 0.15 ka ago, and another speleothem damage event took place between 6.28 ± 0.24 ka and 5.7 ± 1.2 ka ago. These events were most probably accompanied by distinct destructive to very destructive paleoearthquakes with local intensities ranging from VIII to X on the ESI 2007 scale, significant rock weakening, and forming the large deep-seated gravitational slope deformation on the southeastern mountain slopes adjacent to Obir Caves. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2023 Electronic address https://www.sciencedirect.com/science/article/pii/S0169555X22001350?via%3Dihub
Number of the records: 1