Physics – Instrumentation and Detectors
Scientific paper
2012-03-10
Physics
Instrumentation and Detectors
Accepted for publication in Journal of Seismology
Scientific paper
10.1007/s10950-012-9276-9
We report the observation of the ground rotation induced by the Mw=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 confirmed through comparison with fundamental-mode, Rayleigh wave phase velocities predicted for a standard Earth model.
Belfi Jacopo
Beverini Nicolò
Carelli Giorgio
Di Virgilio Angela
Maccioni Enrico
No associations
LandOfFree
Horizontal rotation signals detected by "G-Pisa" ring laser for the Mw=9.0, March 2011, Japan earthquake does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Horizontal rotation signals detected by "G-Pisa" ring laser for the Mw=9.0, March 2011, Japan earthquake, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Horizontal rotation signals detected by "G-Pisa" ring laser for the Mw=9.0, March 2011, Japan earthquake will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-14250