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Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake
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SYSNO ASEP 0467005 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Small-aperture-array translational and rotational seismograms from distant sources - An example of the Jan Mayen Mw 6.8 of 30 August 2012 earthquake Tvůrce(i) Brokešová, J. (CZ)
Málek, Jiří (USMH-B) RID, ORCID, SAIZdroj.dok. Physics of the Earth and Planetary Interiors. - : Elsevier - ISSN 0031-9201
Roč. 256, JUL (2016), s. 1-12Poč.str. 12 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova seismic rotation ; true backazimuth ; apparent seismic phase velocity ; Rayleigh-wave dispersion Vědní obor RIV DC - Seismologie, vulkanologie a struktura Země CEP GA15-02363S GA ČR - Grantová agentura ČR Institucionální podpora USMH-B - RVO:67985891 UT WOS 000378442800001 EID SCOPUS 84965181969 DOI 10.1016/j.pepi.2016.03.013 Anotace We present the seismic rotation rate due to the earthquake of Mw 6.7 at the Jan Mayen island, obtained from broad-band seismograms at a distance of about 2740 km. The order of magnitude of the rotation rate amplitude is only 10-9 rad/s in this case. It is studied with a focus on rotation-to-translation relations. A joint analysis of the rotational and translational data allowed us to determine the true backazimuth and phase velocity of S- and Rayleigh waves. For the surface waves, we studied the frequency dependence of both the backazimuth and phase velocity (wave dispersion). The results are independently confirmed by a method based on time delays between translational records within a small-aperture array. Both methods revealed an unusual velocity drop in the dispersion curve between the periods of 18 and 22 s. This feature may be an indication of a low-velocity zone in the lower crust. Pracoviště Ústav struktury a mechaniky hornin Kontakt Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Rok sběru 2017
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