- an example of the Jan Mayen Mw 6.8 of August 30, 2012 earthquake

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Presentation transcript:

- an example of the Jan Mayen Mw 6.8 of August 30, 2012 earthquake Small-aperture array translational and rotational seismograms from distant earthquakes - an example of the Jan Mayen Mw 6.8 of August 30, 2012 earthquake Jiří Málek1), Johana Brokešová2) and Petr Kolínský3) 1) Charles University, Faculty of Mathematics and Physics, Department of Geophysics, V Holešovičkách 2, 180 00, Prague, Czech Republic Johana.Brokesova@mff.cuni.cz 2) Institute of Rock Structure and Mechanics, Academy of Science, Department of Seismology, V Holešovičkách 41, 182 09, Prague, Czech Republic Malek@irsm.cas.cz 3) Department of Meteorology and Geophysics Faculty of Earth Sciences, Geography and Astronomy, University of Vienna Althanstrasse 14, 1090 Wien, Austria Kolinsky@univie.ac.at EGU 2015 General Assembly, 14 Apr 2015, Vienna

OUTLINE: 6DOF Rotaphone - basic principles - parameters Small-aperture array translational and rotational seismograms from distant earthquakes OUTLINE: 6DOF Rotaphone - basic principles - parameters Records from anthropogenic sources - a quarry blast near Prague How to quantify the importance of rotation compared to translation (RTR) Records from microearthquakes - West Bohemia (Czech Republic), ML 2.3 - Gulf of Corinth (Greece), ML 1.9 - Provadia (Bulgaria), ML 1.6 Contamination of horizontal translations by tilt induced gravitational effects Conclusions EGU 2015 General Assembly, 14 Apr 2015, Vienna

Jana Mayen island earthquake – 2012-08-30 13:43:23.0 UTC Small-aperture array translational and rotational seismograms from distant earthquakes Jana Mayen island earthquake – 2012-08-30 13:43:23.0 UTC Mw 6.7 Small-aperture array Around the Příbram-Háje gas storage (Guralp CMG-40T, 30 s) ~ 2740 km fM < 0.1 Hz EGU 2015 General Assembly, 14 Apr 2015, Vienna

TRANSLATIONAL COMPONENTS [m/s] Small-aperture array translational and rotational seismograms from distant earthquakes TRANSLATIONAL COMPONENTS [m/s] ROTATIONAL COMPONENTS at the Earth’s surface [rad/s] tilts torsion EGU 2015 General Assembly, 14 Apr 2015, Vienna

Array derived rotations (ADR) Small-aperture array translational and rotational seismograms from distant earthquakes Array derived rotations (ADR) after Spudich et al., JGR, 1995 Basic assumption: uniform 1st-order spatial gradients over the whole array !!! EGU 2015 General Assembly, 14 Apr 2015, Vienna

EGU 2015 General Assembly, 14 Apr 2015, Vienna Small-aperture array translational and rotational seismograms from distant earthquakes EGU 2015 General Assembly, 14 Apr 2015, Vienna

EGU 2015 General Assembly, 14 Apr 2015, Vienna Small-aperture array translational and rotational seismograms from distant earthquakes EGU 2015 General Assembly, 14 Apr 2015, Vienna

EGU 2015 General Assembly, 14 Apr 2015, Vienna Small-aperture array translational and rotational seismograms from distant earthquakes EGU 2015 General Assembly, 14 Apr 2015, Vienna

EGU 2015 General Assembly, 14 Apr 2015, Vienna Small-aperture array translational and rotational seismograms from distant earthquakes EGU 2015 General Assembly, 14 Apr 2015, Vienna

EGU 2015 General Assembly, 14 Apr 2015, Vienna Small-aperture array translational and rotational seismograms from distant earthquakes EGU 2015 General Assembly, 14 Apr 2015, Vienna