2017/07/10 by M. P. Ross, Ross, M. P., Krishna Venkateswara +17 · 1 citation
Earth and Planetary Sciences · Engineering · #Advanced Fiber Optic Sensors #FOS: Physical sciences #Geophysics (physics.geo-ph) #Geophysics and Sensor Technology #Seismic Waves and Analysis
paper · pdf · doi:10.48550/arxiv.1707.03084
openalex publication_date 2017/07/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We describe measurements of the rotational component of teleseismic surface waves using an inertial high-precision ground-rotation-sensor installed at the LIGO Hanford Observatory (LHO). The sensor has a noise floor of 0.4 nrad/ √(\rm Hz) at 50 mHz and a translational coupling of less than 1 μrad/m enabling translation-free measurement of small rotations. We present observations of the rotational motion from Rayleigh waves of six teleseismic events from varied locations and with magnitudes ranging from M6.7 to M7.9. These events were used to estimate phase dispersion curves which shows agreement with a similar analysis done with an array of three STS-2 seismometers also located at LHO.