Earth's Background Free Oscillations-Reference-Cited by-同舟云学术

Earth's Background Free Oscillations

Published:1998-03-27 Issue:5359 Volume:279 Page:2089-2091
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Suda Naoki¹²,Nawa Kazunari¹²,Fukao Yoshio¹²

Affiliation:

1. N. Suda and K. Nawa, Department of Earth and Planetary Sciences, Nagoya University, Nagoya, Japan.

2. Y. Fukao, Earthquake Research Institute, University of Tokyo, Tokyo, Japan.

Abstract

Earth's free oscillations were considered to be transient phenomena occurring after large earthquakes. An analysis of records of the IDA (International Deployment of Accelerometers) gravimeter network shows that Earth is freely oscillating at an observable level even in seismically inactive periods. The observed oscillations are the fundamental spheroidal modes at frequencies between 2 and 7 millihertz. Numerical modeling indicates that these incessant excitations cannot be explained by stacked effects of a large number of small earthquakes. The observed “background” free oscillations represent some unknown dynamic process of Earth.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference19 articles.

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4. Federation of Digital Seismograph Networks Station Book (Incorporated Research Institutions for Seismology Washington DC 1994).

5. Agnew D. C., et al., Eos 67, 203 (1986).

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