NDLI: Anomalous propagation of refracted waves beneath the Orlík water reservoir, Czech Republic

Content Provider	Springer Nature Link
Author	Málek, Jiří votný, Oldřich Gaždová, Renata Žanda, Libor
Copyright Year	2010
Abstract	The Orlík water reservoir was built on the Vltava River in the places where the river crosses the geological unit called the Central Bohemian Pluton. Previous geological studies have disclosed no significant lateral inhomogeneity or fault zone in the close vicinity of the reservoir. However, repeated levellings, performed there in the 1950s and 1960s, revealed a systematic subsidence of the Vltava River valley. Using these measurements, the idea of the tectonic origin of the valley was even formulated. Recent seismic observations have also attracted attention to this region. Namely, a macroseismically felt earthquake occurred there on January 13, 2007, and many weaker earthquakes have been recorded by local seismic networks since 1992. To increase the accuracy of locating these seismic events, recently we have carried out refraction measurements along a short profile across the Orlík reservoir. These authors smoothed the observed travel times and derived a 1-D velocity model of the shallow crustal structure for the Orlík region. In the present paper, using the same refraction measurements, we study some anomalies in wave propagation beneath the Orlík reservoir. In particular, it is shown that the passage of seismic waves beneath the reservoir leads to their time delays and spectral changes. Moreover, we have also recognised similar time delays in earlier data from the nearby international profile CEL09 in the places where the profile crosses the Orlík reservoir.
Starting Page	389
Ending Page	401
Page Count	13
File Format	PDF
ISSN	00393169
Journal	Studia Geophysica et Geodaetica
Volume Number	54
Issue Number	3
e-ISSN	15731626
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-09-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Vltava River Orlík reservoir refraction measurement travel time spectrum anomaly Meteorology/Climatology Structural Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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