Tilt Seismology

Document #:

LIGO-P1700149-v7

Document type:

P - Publications

Abstract:

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/sqrt(Hz) at 50 mHz and a translational coupling of less than 1 urad/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.

Files in Document:

• TiltSeismology.pdf (5.1 MB)

Other Files:

• Data and Analysis (TiltSeis.zip, 7.2 MB)

Topics:

• Seismic Isolation

Authors:

• Michael Ross
• Krishna Venkateswara
• Jeffrey Kissel
• Jim Warner
• Hugh Radkins
• Thomas Shaffer
• Michael Coughlin

Keywords:

BRS Seismology Seismic

Notes and Changes:

Submitted to Geophysical Research Letters.