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Alternative Mechanisms of the Microseisms Excitation
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SYSNO ASEP 0435072 Document Type O - Others R&D Document Type Others Title Alternative Mechanisms of the Microseisms Excitation Author(s) Kalenda, Pavel (USMH-B) RID
Wandrol, I. (CZ)
Holub, Karel (UGN-S) RID
Rušajová, Jana (UGN-S)Number of authors 4 Source Title European Conference on Earthquake Engineering and Seismology (2ECEES) /2./. - Istanbul : Turkish Earthquake Foundation Earthquake Engineering Committee, 2014 Number of pages 1 s. Publication form Print - P Action European Conference on Earthquake Engineering and Seismology (2ECEES) /2./ Event date 24.08.2014-29.08.2014 VEvent location Istanbul Country TR - Turkey Event type EUR Language eng - English Country TR - Turkey Keywords microseisms ; thermoelastic waves ; annual drift Subject RIV DC - Siesmology, Volcanology, Earth Structure R&D Projects LM2010008 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UGN-S - RVO:68145535 ; USMH-B - RVO:67985891 Annotation The annual drift is typical for microseisms. We propose a model based on the generation of thermoelastic waves, which explains the highest microseisms during winter by the higher stress level. If we remove the average influence of the stress background from the microseisms, we obtain the residua of microseisms, which show the semiannual periods with the maxima in March and October. The histogram of occurrence of anomalous microseisms has the same form as the variations of Length Of the Day (LOD). This mechanism was recognized as a secondary order mechanism after the annual drift. The synoptic situations and earthquakes were recognized as imminent triggers of anomalous microseisms. This synoptic situation is consistent with the uplift of the northern part of Europe after the ice cup melting. Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2015
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