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http://hdl.handle.net/2122/7578
Authors: | Belfi, J.* Beverini, N.* Carelli, G.* Di Virgilio, A.* Maccioni, E.* Saccorotti, G.* Stefani, F.* Velikoseltzev, A.* |
Title: | Horizontal rotation signals detected by “G-Pisa” ring laser for the Mw = 9.0, March 2011 Japan earthquake | Journal: | Journal of Seismology | Series/Report no.: | 4/16(2012) | Publisher: | Springer Science+Business Media B.V. | Issue Date: | 2012 | DOI: | 10.1007/s10950-012-9276-9 | Keywords: | Rotational Seismology Gyrolaser Japan Earthquake |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques | Abstract: | We report the observation of the ground rotation induced by theMw=9.0, 11th of March 2011, Japan earthquake. The rotation measurements have been conducted with a ring laser gyroscope operating in a vertical plane, thus detecting rotations around the horizontal axis. Comparison of ground rotations with vertical accelerations from a co-located force{balance accelerometer shows excellent ring laser coupling at periods longer than 100s. Under the plane wave assumption, we derive a theoretical relationship between horizontal rotation and vertical acceleration for Rayleigh waves. Due to the oblique mounting of the gyroscope with respect to the wave direction{of{arrival, apparent velocities derived from the acceleration / rotation rate ratio are expected to be always larger than, or equal to the true wave propagation velocity. This hypothesis is con_rmed through comparison with fundamental{mode, Rayleigh wave phase velocities predicted for a standard Earth model. |
Appears in Collections: | Article published / in press |
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JofS_PP_Belfi_et_al_2011.pdf | 216.37 kB | Adobe PDF | View/Open |
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