Głębokie badania geoelektryczne struktury skorupy i płaszcza Ziemi w Polsce

• Autorzy: Jóźwiak W. , Semenov V. Y.

Warianty tytułu

EN

Deep geoelectrical investigations of the crust and mantle conductivity in Poland

• Języki publikacji: PL

Abstrakty

PL

Badania eksperymentalne w Transeuropejskiej Strefie Szwów (TESZ), oddzielającej Platformę Wschodnioeuropejską od młodszej, faneorozoicznej Europy, były prowadzone we współpracy międzynarodowej metodami zarówno sejsmicznymi (projekt POLONAISE '97 i CELEBRATION 2000), jak i elektromagnetycznymi (projekty PREPAN, CEMES, EMTESZ). W artykule przedstawiono przegląd wyników głębokich sondowań elektromagnetycznych uzyskanych w Polsce w ostatnim dziesięcioleciu. Podstawowym wynikiem było odkrycie dobrze przewodzącej anomalii w górnym płaszczu (150-250 km) w środkowej Polsce pod Transeuropejską Strefą Szwów. Porównanie danych z obserwatoriów geomagnetycznych wokół Polski wykazuje, że tylko dwa z nich - Belsk i Niemegk odznaczają się zwiększoną intensywnością składowej horyzontalnej pola magnetycznego. Świadczy to o występowaniu pod nimi anomalii dobrze przewodzącej. Analiza wyników sondowań magnetowariacyjnych z całej Europy wskazuje na istnienie niejednorodności w średnim płaszczu Ziemi lub, ewentualnie, zmiany jego struktury pod Europą. Możliwe, że te niejednorodności są związane z TESZ.

EN

The experimental investigations of the Trans-European Suture Zone (TESZ) separating the East European Plate from the younger, phanerozoic Europe are carried actively out by the international community both seismic (projects POLONAISE'97, CELEBRATION 2000) and electromagnetic (projects PREPAN, CEMES, EMTESZ) methods. The review of the results of the deep electromagnetic soundings obtained in Poland for the recent decade is presented in this work. The main result is discovery of a conductive anomaly in the upper mantle (150-250 km) in the middle Poland beneath the Trans-European Suture Zone. In accordance with observations at geomagnetic observatories around Poland, only two of them: Belsk and Niemegk have an increased intensity of the horizontal magnetic field. This fact can be interpreted as existence of the conductive structures beneath them. Analysis of the collected response functions all over European observatories allows suggesting existence of electrical inhomogeneities in the mid-mantle or changing in its structure beneath Europe. Maybe the structure is connected with TESZ.

Słowa kluczowe

PL

indukcja elektromagnetyczna; magnetotelluryka; przewodnictwo elektryczne; Strefa Szwu Transeuropejskiego

EN

electromagnetic induction; magnetotellurics; electrical conductivity; Trans-European Suture Zone

• Wydawca: Polskie Towarzystwa Geofizyczne ; Komitet Geofizyki PAN
• Czasopismo: Przegląd Geofizyczny
• Rocznik: 2006
• Tom: Z. 1
• Strony: 55--69
• Opis fizyczny: wykr., bibliogr. 41 poz.

Twórcy

autor

Jóźwiak W.

autor

Semenov V. Y.

• Instytut Geofizyki PAN, Warszawa

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