Geology and Geological Hazards of Poland

Sudeten Mountains (Sudetes)

• Formation and Orogeny: The Sudetes (Polish: Sudety) were formed through numerous phases of Precambrian and Paleozoic orogenies. Their final folding and stiffening occurred during the Hercynian (Variscan) orogeny.
• Geological Structure: Each orogenic cycle was characterized by intense magmatism and metamorphism. These processes, combined with multiple folding phases and deep erosion that exposed crystalline parts, resulted in a highly complex "mosaic" structure.
• Sudetic Marginal Fault: A significant morphotectonic feature is the Sudetic Marginal Fault (sudecki uskok brzeżny), which presents as a morphotectonic scarp.     * Interpretations of movement include strike-slip movements and compressions.     * Local geology involves metamorphic rocks (Paleozoic) with basaltic veins (Tertiary).     * Sediments at the edge include Tertiary and Quaternary deposits resulting from scarp destruction, as well as glacial and fluvial sediments (Quaternary).

Regional Divisions of the Polish Sudetes

• Western Sudetes: Comprised of the Izerskie Mts., Karkonosze, Kaczawskie Mts., and Rudawy Janowickie.     * Karkonosze: Home to Mt. Śnieżka, the highest peak at $1603\,m a.s.l.$.     * Kaczawskie Mountains: Site of pillow lava formations (found near Wleński Gródek) and the Ostrzyca mountain ($Miocene$), which is a remnant of a volcano.
• Central Sudetes: Includes the Krucze Mts., Wałbrzyskie Mts., Kamienne Mts., Sowie Mts., Bardzkie Mts., Stołowe Mts. (noted for unique rock formations), Olickie Mts., and Bystrzyckie Mts.
• Eastern Sudetes: Comprised of the Śnieżnika Massif, Bialskie Mts., Złote Mts., and Ruchlewskie Hory Mts.
• Sudetes Foreland: Separated from the mountains by the Sudetic Marginal Fault; it includes features like Mt. Ślęża.

Geological History of the Sudetes

• Cambrian Period ($570$ million years ago): The Sudeten region was submerged, leading to the deposition of sedimentary rocks. Notable deposits include the Wojcieszowski limestone (white and pink), which reaches thicknesses of up to $500\,m$.
• Volcanic Activity: Underwater volcanic activity in the Kaczawa Mountains created pillow lava.
• Lithology across Sections: Geological profiles show a variety of structures including the North-Sudetic Trough (Niecka Północnosudecka) containing Carboniferous, Permian ($P_2+3$), Triassic ($T_1$), and Cretaceous ($K_2$) deposits, as well as Ordovician-Devonian ($O-D_1$) formations.

Holy Cross Mountains (Góry Świętokrzyskie)

• Location and Tectonics: Located in central Poland, these mountains are part of the Central Polish Anticlinorium, situated between the East-European Precambrian Platform and the Paleozoic Platform, near the Teisseyre-Tornquist Suture.
• Topography: Notable for the Łysogóry ridge, which features "Gołoborza" (blockfields/scree slopes). The highest peak is Mt. Łysica at $614\,m a.s.l.$.
• Geological Composition:     * The region contains Precambrian, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian (Zechstein), Triassic, Jurassic, Cretaceous, and Cenozoic (Paleogene, Neogene, Quaternary) rocks.     * Specific sites like Chęciny showcase middle and upper Devonian dolomites and limestones, as well as Triassic sandstones.

Paleontology and History in the Holy Cross Region

• Oldest Quadruped: The quarry in Zachełmie contains tetrapod trackways dating back to $360\text{--}385$ million years (Middle Devonian).     * Traces measure up to $26\,cm$ in width.     * The animal was approximately $2.5\,meters$ long.     * The lack of "bloated body" signs suggests smooth movement on land and capable swimming.
• Raj Cave: Inhabited by Neanderthals approximately $50,000$ years ago. It contains artifacts from the Mousterian culture and is one of the northernmost sites of this culture in Europe.
• Krzemionki Opatowskie: Prehistoric striped flint mines exploited between approximately $3900$ and $1600\,BC$ (Neolithic period).

Natural Resources of Poland

• Energy Resources: Black coal, brown coal (lignite), crude oil, natural gas, and shale gas (perspective areas in Central and Eastern Europe).
• Metallic Ores: Iron ore, copper ore, zinc, and lead ore.
• Non-metallic minerals: Sulphur, salt (halite), sylvite, phosphorites, and striped flint.
• Salt Structures: Central Poland features a region of salt diapirs/plugs (e.g., in Kujawy). These structures sometimes pierce through Mesozoic sedimentary cover. Examples include Rogoźno and Inowrocław.

Geothermal and Thermal Characteristics

• Heat Flow: Maps of Poland show varying heat flow values, with higher activity in the Paleozoic Platform areas compared to the stable East-European Platform.
• Suwałki Anorthosite Massif (SMA): A schematic geological section reveals the presence of Precambrian anorthosites and norites. Historically, this area is associated with predicted paleopermafrost (wieloletnia zmarzlina) within the sedimentary cover of Jurassic and Cretaceous rocks.

Geological Hazards in Poland: Landslides

• Polish Landslide Prevention System (SOPO): Managed by the Polish Geological Institute, based on a $1:10,000$ scale survey identifying over $58,000$ landslides.
• Carpathian Landslides: Extensive mapping covers $201$ counties in the Carpathians.
• Szklarki Landslide: Located in the Maślana Góra massif (Beskid Niski), it is the largest historical landslide in the Polish Carpathians.     * Original movement: $1784$.     * Re-activated: $1913$ following catastrophic rainfall.
• Anthropogenic Influence: Landslides often occur at the shores of dam reservoirs, such as the Włocławek Reservoir. Research from $1970\text{--}2011$ shows that movement acceleration correlates with water level fluctuations and precipitation (e.g., Jan-Feb $2011$ main phase).

Seismicity and Geodynamics

• Natural Earthquakes: Rare in Poland. Only $76$ natural earthquakes recorded in the last millennium.
• Intensity: Historic quakes reached magnitudes of $4\text{--}5$ on the European Macroseismic Scale (EMS).
• Seismic Regions: Divided into several zones including the T-T zone (Western Pomerania, Holy Cross Mts.), the Sudetes, and the Carpathians (Podhale/Pieniny).
• Recent Activity: Small tremors (magnitudes $2.0\text{--}4.3$) recorded in $2022$ in areas like Katowice, Lubin, and Jaworzno, often associated with mining activity (induced seismicity).

Erosion and Ground Instability

• Coastal Erosion: The sea cliff in Trzęsacz is a famous example.     * Distance from church to coast: $XV$ century ($1.8\text{--}2\,km$), $1750$ ($58\,m$), $1868$ ($1\,m$).     * First fragments of the church collapsed into the sea in $1901$.
• Ground Subsidence Case Study (Wapno, 1977): A catastrophic ground subsidence occurred in Wapno due to the collapse of a salt mine, leading to the destruction of surface infrastructure (e.g., Obrońcy Stalingradu Street).
• Loess Erosion (Suffosion): Predominant in loess areas like Kazimierz Dolny, forming "wąwóz lessowy" (loess gullies) such as Korzeniowy Dół.

Hydrological Hazards: Flooding

• Pluvial Floods: Historical catastrophic floods include Wisła river valley ($1813$) and Zakopane ($1934$).
• Ice-Jam Floods: The largest flood caused by ice accumulation occurred in the Wisła river valley at Włocławek Lake in $1982$.

Urban Geology of Warsaw

• Geological Layers: Construction of the Second Metro Line (central section) crosses various soils including Quaternary glacitectonite, sands, and problematic Pliocene clays (illy).
• Geomorphology: The Wisła valley features distinct terraces:     * Flood plain (Taras zalewowy) with oxbow lakes.     * Over-flood terraces (Tarasy nadzalewowe/wydmowe).     * Warsaw Escarpment (Skarpa Warszawska): A prominent morphological boundary separating the higher morainic plains (Równina Warszawska) from the river valley.

Nature Conservation in Poland

• National Parks: Poland maintains numerous national parks (Parki Narodowe) including Słowiński (coastal dunes), Karkonoski, Świętokrzyski, Bieszczadzki, and Tatrzański.
• Landscape Diversity: Geographic features range from coastal areas and lakelands (Suwalszczyzna) to uplands (Jura Krakowsko-Częstochowska) and high mountains (Tatry).