W jaki sposób badać sejsmity? Przegląd metod badawczych

• Authors: Belzyt Szymon , Pisarska-Jamroży Małgorzata

Title variants

How to study seismites? A review of research methods

• Languages of publication: PL

Abstracts

PL

Propagacja, wywołanej trzęsieniem ziemi, fali sejsmicznej w uwodnionych nieskonsolidowanych osadach drobnoziarnistych powodować może ich upłynnienie. W efekcie tego procesu powstać mogą warstwy zawierające struktury deformacyjne zwane sejsmitami. Zaproponowanie sejsmicznej genezy warstw zdeformowanych opiera się na zastosowaniu kryteriów rozpoznawczych. W tym celu konieczne jest: (1) przeprowadzenie analizy litofacjalnej osadów występujących w analizowanym profilu; (2) szczegółowe opisanie: deformacji, z uwzględnieniem ich rozmieszczenia w profilu i w obrębie zdeformowanej ławicy, rozciągłości poziomej, zróżnicowania przestrzennego, geometrii, tekstury i struktury osadów zaangażowanych w deformacje, osadów otaczających oraz zmiany rozkładu przestrzennego struktur deformacyjnych przy wykorzystaniu ścięcia poziomego i ukośnego; (3) wytypowanie struktur, które mogły powstać w efekcie upłynnienia i porównanie ich ze współcześnie tworzącymi się deformacjami związanymi ze wstrząsami sejsmicznymi; (4) rozpoznanie budowy geologicznej podłoża skalnego, w tym m.in. opis aktywności uskoków; (5) dyskusja innych mechanizmów, które mogły odpowiadać za powstanie deformacji; (6) określenie czasu powstania struktur deformacyjnych.

EN

Earthquake-triggered seismic wave propagation can induce liquefaction of water-saturated unconsolidated finegrained clastic sediments. As a result, layers with soft-sediment deformation structures called seismites can be formed. To propose a seismic origin of the layer, it should meet recognition criteria. Therefore, it is necessary to provide (1) a lithofacies analysis of the sediments in the studied section; (2) a detailed description of deformation structures including their position in the sedimentological log as well as within the deformed layer, lateral extent and continuity, geometry, texture and structure of both deformed and host sediments, spatial distribution and heterogenity of deformation structures in the plan view as well as an oblique view; (3) identification of structures that could have been formed during a liquefaction process and a comparison with those that recently occurred in tectonically active zones as an earthquake effect; (4) a subsurface geological structure recognition, particularly the presence and activity of faults; (5) discussion and elimination of all other possible triggers that could have caused sediment deformation; (6) estimation of the age of the deformation.

Keywords

PL

deformacje w osadach nieskonsolidowanych; paleosejsmologia; trzęsienia ziemi

EN

soft-sediment deformation structures; palaeoseismology; earthquakes

• Publisher: Łódzkie Towarzystwo Naukowe, Stowarzyszenie
• Journal: Acta Geographica Lodziensia
• Year: 2017
• Volume: 106
• Pages: 171-180

Dates

published

2017

Contributors

author

Belzyt Szymon

• Uniwersytet im. Adama Mickiewicza, Instytut Geologii

author

Pisarska-Jamroży Małgorzata

• Uniwersytet im. Adama Mickiewicza, Instytut Geologii

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Identifiers

ISSN

0065-1249