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《International Geology Review》2012,54(1):33-50
In the Dnepr-Donets trough, salt domes having their origin in Devonian rocks were formed by four stages of cyclic tectonic activity from Late Devonian through Cretaceous. Three types of domes were formed: open piercement core, crypto-diapir, and crypto-diapiroid. - M. Russell. 相似文献
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Ground motion amplifications in the Dinar basin, and contributions of the surface waves generated from basin edges are investigated in frequency and time domains. Amplification functions are computed from the aftershock data of the October 1, 1995 Dinar earthquake (MW=6.4) using the Standard Spectral Ratio method which requires a pair of instruments; one located at the site under investigation (generally on alluvium) and the other on a reference site, preferably a nearby rock site. First, a time window covering the whole signal is used to compute the amplification function, and, successively, the noise, P wave, S wave and the surface wave time windows are used in computation to observe their contributions to the amplification function. It is seen that the maximum amplifications observed at about 2.0 Hz on the amplification functions of the stations located in the basin are largely due to basin edge induced surface waves. These waves have significantly increased the duration of signals recorded within the basin. Particularly, on the vertical component records, the amplitudes of surface waves are larger than the S-wave amplitudes. The periods of waves amplified maximally due to the basin structure coincide with the natural periods of 4–6-story buildings which were heavily damaged in Dinar. This indicates that the site effects may have been important regarding the damage which occurred during the Dinar earthquake of October 1995. 相似文献
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E. Durukal M. Erdik J. Avci
. Yüzügüllü Y. Alpay B. Avar C. Zülfikar T. Biro A. Mert 《Soil Dynamics and Earthquake Engineering》1998,17(7-8):557-578
Dinar earthquake (Mw=6.0, USGS) occurred on October 1, 1995 causing casualties and physical damage (Io=VII–VIII MSK). The earthquake was associated with predominantly normal faulting. The PGA in Dinar was 0.33 g. Strong motion data associated with the mainshock and aftershocks of the 1995 Dinar, Turkey earthquake have been analyzed to investigate the source, attenuation and site response parameters. Strong motion data were baseline corrected, local magnitudes were computed and inelastic attenuation parameters, seismic moments and corner frequencies were assessed. A parametric analysis is attempted to understand the correlation of damage distribution with the fault parameters. It is believed that the obtained data will complement the relatively scarce earthquake data associated with extensional regimes. 相似文献
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