Ambient Earth noise: A survey of the Global Seismographic Network

[1] It has been a decade since the last comprehensive model of ambient Earth noise was published (Peterson, 1993). Since then, observations of ambient Earth noise from the Incorporated Research Institutions for Seismology (IRIS) Global Seismographic Network (GSN) of widely distributed, similarly equipped, and well-calibrated stations have become available. The broad geographic sampling of this large data set and the ease of access to waveform data provided by the IRIS Data Management System facilitate analysis of global noise samples. We have analyzed data from the 118 GSN stations operating during the year July 2001 through June 2002. On the basis of over 738,000 hourly spectral estimates computed from these stations' data, we have developed a robust noise model that exhibits significant differences from previous models both in the normal mode and body wave bands. Our analysis technique has the advantage that we do not need to search for quiet periods but can include all data where the instruments are operating correctly.

[1]  J. Peterson,et al.  Observations and modeling of seismic background noise , 1993 .

[2]  Barbara Romanowicz,et al.  Excitation of Earth's continuous free oscillations by atmosphere–ocean–seafloor coupling , 2004, Nature.

[3]  P. Lognonné,et al.  The effects of the atmospheric pressure changes on seismic signals or how to improve the quality of a station , 1996, Bulletin of the Seismological Society of America.

[4]  James E. Fix,et al.  Ambient earth motion in the period range from 0.1 to 2560 sec , 1972, Bulletin of the Seismological Society of America.

[5]  Jack Oliver,et al.  The Seismic Noise of the Earth’s Surface , 1959 .

[6]  Fukao,et al.  Earth's background free oscillations , 1998, Science.

[7]  Jon Peterson.  Preliminary observations of noise spectra at the SRO and ASRO stations , 1980 .

[8]  Jacques Hinderer,et al.  The search for the Slichter mode: comparison of noise levels of superconducting gravimeters and investigation of a stacking method , 2003 .

[9]  D. E. Willis,et al.  The spectrum of seismic noise , 1962 .

[10]  Jeroen Tromp,et al.  The global seismographic network surpasses its design goal , 2004 .

[11]  S. Webb,et al.  Broadband seismology and noise under the ocean , 1998 .

[12]  Duncan Carr Agnew,et al.  Vertical seismic noise at very low frequencies , 1978 .

[13]  Andrew J. Murphy,et al.  A comprehensive study of long-period (20 to 200 seconds) earth noise at the high-gain worldwide seismograph stations , 1975, Bulletin of the Seismological Society of America.

[14]  W. Zürn,et al.  On noise reduction in vertical seismic records below 2 mHz using local barometric pressure , 1995 .

[15]  Mark A. Bullock,et al.  Undergraduates study climate change science, philosophy, and public policy , 2002 .