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Seismic Wave Velocities in Deep Sediments in Poland: Borehole and Refraction Data Compilation

Polkowski M., Grad M.

Acta Geophysica

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2015

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Vol. 63, no. 3

698--714

EN

Sedimentary cover has significant influence on seismic wave travel times and knowing its structure is of great importance for studying deeper structures of the Earth. Seismic tomography is one of the methods that require good knowledge of seismic velocities in sediments and unfortunately by itself cannot provide detailed information about distribution of seismic velocities in sedimentary cover. This paper presents results of P-wave velocity analysis in the old Paleozoic sediments in area of Polish Lowland, Folded Area, and all sediments in complicated area of the Carpathian Mountains in Poland. Due to location on conjunction of three major tectonic units - the Precambrian East European Craton, the Paleozoic Platform of Central and Western Europe, and the Alpine orogen represented by the Carpathian Mountains the maximum depth of these sediments reaches up to 25 000 m in the Carpathian Mountains. Seismic velocities based on 492 deep boreholes with vertical seismic profiling and a total of 741 vertical seismic profiles taken from 29 seismic refraction profiles are analyzed separately for 14 geologically different units. For each unit, velocity versus depth relations are approximated by second or third order polynomials.

2

Seismic wave velocities in the sedimentary cover of Poland: Borehole data compilation

Grad M., Polkowski M.

Acta Geophysica

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2012

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Vol. 60, no. 4

985-1006

EN

A knowledge of seismic wave velocities in the sedimentary cover is of great importance for interpreting reflection and refraction seismic data, deep seismic soundings and regional and global seismic tomography. This is particularly true for regions characterized by significant thicknesses and a complex sedimentary cover structure. This paper presents the results of an analysis of seismic P-wave velocities in the sedimentary cover of Poland, a complex area of juxtaposition of major tectonic units: the Precambrian East European Craton, the Palaeozoic Platform of Central and Western Europe, and the Alpine orogen represented by the Carpathian Mountains. Based on vertical seismic profiling data from 1188 boreholes, the dependence of velocity versus depth was determined for regional geological units and for successions from the Tertiary and Quaternary to the Cambrian. The data have been approximated by polynomials, and velocity-depth formulas are given down to 6000 m depth. The velocities in the sedimentary cover have been compared with those from other areas in Europe.

3

Odpływ podziemny w zlewni Bystrzycy (Góry Bystrzyckie)

Rysiukiewicz M.

Biuletyn Państwowego Instytutu Geologicznego

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2010

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nr 440

127--134

PL

W artykule przedstawiono ocenę odpływu podziemnego w zlewni Bystrzycy w Górach Bystrzyckich w Sudetach Środkowych. Bazując na danych dotyczących natężenia przepływu rzeki z trzech okresów: 1973–1982, 2000–2001 i 2006–2008, określono odpływ podziemny, stosując różne metody hydrologiczne. Uzyskane wartości odpływu podziemnego zawierają się w przedziale od 0,55 m3/s (8,67 l/s•km2) (obliczone metodą Natermanna) dla dziesięciolecia 1973–1982 do 0,65 m3/s (10,25 l/s•km2) (obliczone metodą Wundta) dla lat 2000–2001. Wyniki kartowania hydrogeologicznego źródeł oraz analiza budowy geologicznej zlewni były podstawą do wykonania mapy zmienności modułu odpływu podziemnego w zlewni i określenia ilości wody pochodzącej z drenażu skał kredowych i podłoża krystalicznego.

EN

The paper presents the results of groundwater runoff evaluation in the Bystrzyca River catchment located in the Bystrzyckie Mts. (Middle Sudetes). Based on river discharge data collected during three periods of time (1973–1982, 2000–2001 and 2006–2008), groundwater runoff was estimated using different hydrological methods. The estimated values of groundwater runoff range from 0.55 m3/s (8.67 l/s•km2) for the period of 1973–1982 using Natermann’s method to 0.65 m3/s (10.25 l/s•km2) for the period of 2000–2001 using Wundt’s method. The results of hydrogeological mapping of springs and analysis of the geological structure of the catchment were taken into account to produce the map of spatial distribution of specific groundwater runoff and to estimate the amount of water discharged from the Cretaceous cover and crystalline basement.

4

The problem of "diastrophic" blocks in the marginal parts of the Late Cretaceous Nysa Kłodzka graben, the Sudetes, SW Poland

Don J.

Geologia Sudetica

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2003

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Vol. 35

61-67

EN

In the marginal parts of the Nysa Kłodzka graben, the presence of "diastrophic" blocks sliding from the frames of the developing morphological depression were distinguished with the use of radar and remote sensing (J. Šebesta in: Batik et al., 1996). The results of mapping and structural observations in the field surprisingly point to the subhorizontal displacement of Cretaceous beds to the outside of the graben, i.e. in the opposite direction to the slide of "diastrophic" blocks suggested by J. Šebesta. The process of subhorizontal overlapping of the Cretaceous beds onto the metamorphic framework may be related to the bursting action of the sediments filling the Nysa Kłodzka graben during the process of subsidence and their squeezing in a wedge-like style into the graben, which narrowed with depth (subhorizontal extensional faults).

5

Rola pokrywy osadowej w kształtowaniu obrazu anomalii siły ciężkości obszaru lubelskiego

Bojdys G., Grabowska T.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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1999

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T. 25, z. 1

25-43

PL

W artykule przedstawiono efekty grawitacyjne związane z rozkładem gęstości w obrębie pokrywy osadowej. Bazę obliczeń stanowiły 3D modele gęstościowe kompleksów stratygraficznych (od trzeciorzędu do dewonu), skonstruowane na podstawie map geologiczno-strukturalnych i danych z wierceń. Przeprowadzone obliczenia pozwoliły ocenić udział pokrywy osadowej w kreowaniu anomalii grawimetrycznych o charakterze lokalnym. Wyniki obliczeń zestawione w formie map omówiono na tle ważniejszych dyslokacji lokalizowanych na podstawie danych geologicznych i sejsmicznych. Wskazano również na możliwość istnienia głęboko zakorzenionych NW-SE stref uskokowych w obszarze podniesienia radomsko-kraśnickiego, mogących pozostawać w związku z przebiegiem krawędzi krystalicznego cokołu wschodnioeuropejskiej platformy prekambryjskiej

EN

The paper presents gravity effects from density distribution in the sedimentary cover in the Lublin region. 3D density models of stratigraphic complexes (from Tertiary through Devonian) constructed on the basis of borehole data and geological and structural maps were used in computations. A contribution of the sedimentary cover to generating local gravity anomalies was estimated. The results of computation, given in the form of maps, are discussed taking into account major dislocations determined from geological and seismic data. It is also shown that some deep - seated fault zones with NW-SE course may occur in the Radom-Kraśnik elevation. These zones may be related with the edge of the crystalline base of the East European Precambrian Platform