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6 results for “Geological Hazards”
Inventory maps of hazardous geological processes_Transcarpathia, Ukraine
<p>Under the ImProDiReT Project running at Regional Transcarpathia level an Inventory maps of the hazardous geological processes’ manifestations for the Transcarpathia (landslides, mudflows, flooding and flash floods, karst) have been created.</p>
Hazardous geological processes occurrence assessment for Transcarpathian region,_Ukraine
<p>Maps of hazardous geological processes specific occurrence by administrative districts for Transcarpathian region were produced by the Institute of Geological Sciences of the National Academy of Sciences of Ukraine based on the processing of materials from such institutions: State Service of Geology and Mineral Resources of Ukraine, Transcarpathian geological and hydrogeological center of the State Enterprise "Zakhidukrgeologiia" of the National Joint Stock Company "Nadra Ukrainy", Berehovo, State Geological Information Archive of Ukraine. In particular, maps of the distribution of hazardous geological processes with a scale of 1:100000 (by V. Barnychka, 1980) and a scale of 1: 200000 (by M. Gabor) for the period 1980-2010 were used, as well as data provided by V. Petryk ("Zakhidukrgeologiia", 1983-2001), and data from information yearbooks on the of hazardous exogenous geological processes activization for Ukraine territory according to monitoring of engineering and geological processes 2015-2018. The ranking principles for Transcarpathian region administrative districts due to the hazardous geological processes occurrence depended on type of process.</p>
Data from: Geologic and geomorphic controls on rockfall hazard: how well do past rockfalls predict future distributions?
To evaluate the geospatial hazard relationships between recent (contemporary) rockfalls and their prehistoric predecessors, we compare the locations, physical characteristics, and lithologies of rockfall boulders deposited during the 2010-2011 Canterbury earthquake sequence (CES) (n=185) with those deposited prior to the CES (n=1093). Population ratios of pre-CES to CES boulders at two study sites vary spatially from ~5:1 to 8.5:1. This is interpreted to reflect (i) variations in CES rockfall flux due to intra- and inter-event spatial differences in ground motions (e.g. directionality) and associated variations in source cliff responses, (ii) possible variations in the triggering mechanism(s), frequency, flux, record duration, boulder size distributions, and post-depositional mobilization of pre-CES rockfalls relative to CES rockfalls, and (iii) geological variations in the source cliffs of CES and pre-CES rockfalls. On interfluves, CES boulders traveled approximately 100 to 250 m further downslope than prehistoric (pre-CES) boulders, interpreted to reflect reduced resistance to CES rockfall transport due to preceding anthropogenic hillslope de-vegetation. Volcanic breccia boulders are more dimensionally equant, rounded, larger, and traveled further downslope than coherent lava boulders, illustrating clear geological control on rockfall hazard. In valley bottoms, the furthest-traveled pre-CES boulders are situated further downslope than CES boulders due to (i) remobilization of pre-CES boulders by post-depositional processes such as debris flows, and (ii) reduction of CES boulder velocities and travel distances by collisional impacts with pre-CES boulders. A considered earth-systems approach is required when using preserved distributions of rockfall deposits to predict the severity and extents of future rockfall events.
Data from: Geologic and geomorphic controls on rockfall hazard: how well do past rockfalls predict future distributions?
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Coupling Multiple Models For Dynamic Simulation Of Geological Hazard Chains: A Case Study Of Baige Landslide, Jinsha River, China
<p><strong>Coupling Multiple Models For Dynamic Simulation Of Geological Hazard Chains: A Case Study Of Baige Landslide, Jinsha River, China </strong></p>
Figure 6 from: Tilley L, Berning B, Erdei B, Fassoulas C, Kroh A, Kvaček J, Mergen P, Michellier C, Miller C, Rasser M, Schmitt R, Kovar-Eder J (2019) Hazards and disasters in the geological and geomorphological record: a key to understanding past and future hazards and disasters. Research Ideas and Outcomes 5: e34087. https://doi.org/10.3897/rio.5.e34087
Figure 6 A tektite that originates from the distal ejecta (strewn field) of the Ries impact, found in the Czech Republic. Tektites from the Ries impact are called moldavites. Ruler at the bottom of the image = 6.6 cm [Inventory number NHMV_J677]. Photo courtesy of L. Ferrière, Natural History Museum Vienna.
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