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Computation of seismograms and atmospheric oscillations by normal-mode summation for a spherical earth model with realistic atmosphere

Lognonné, P. and Clévédé, Eric and Kanamori, Hiroo (1998) Computation of seismograms and atmospheric oscillations by normal-mode summation for a spherical earth model with realistic atmosphere. Geophysical Journal International, 135 (2). pp. 388-406. ISSN 0956-540X. http://resolver.caltech.edu/CaltechAUTHORS:20141106-092952748

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Abstract

We describe a theory to compute seismograms and atmospheric disturbances such as ionospheric oscillations or pressure variations in a realistic spherical earth model with atmosphere. This theory is valid for a source located either in the solid earth or in the atmosphere. Solid earth and atmospheric normal modes are computed for a radiation boundary condition that models the dissipation of acoustic signals in the high atmosphere of the Earth. We show that the coupling between ground and atmosphere occurs at a set of frequencies related to fundamentals and harmonics of atmospheric modes. Spheroidal modes near these frequencies have up to 0.04 per cent of their energy in the atmosphere, and thus may be strongly excited by atmospheric sources. This theory can be used for more accurate modelling of the seismic data from meteoritic events or volcanic eruptions as well as for the analysis of barograms or ionograms recorded after large earthquakes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1046/j.1365-246X.1998.00665.x DOIArticle
http://onlinelibrary.wiley.com/doi/10.1046/j.1365-246X.1998.00665.x/abstractPublisherArticle
Additional Information:© 1998 RAS. Accepted 1998 June 3. Received 1998 April 10; In original form 1997 August 1. This is IPGP contribution number 1542 and California Institute of Technology contribution number 8479. We thank Tony Dahlen and an anonymous reviewer for constructive reviews. This work was initiated by PL during a visiting position at the Seismological Laboratory of the California Institute of Technology.
Subject Keywords:acoustic impedance; atmosphere; explosion seismology; ionosphere; normal modes; seismograms
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Caltech Division of Geological and Planetary Sciences8497
Record Number:CaltechAUTHORS:20141106-092952748
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141106-092952748
Official Citation:Lognonné, P., Clévédé, E., & Kanamori, H. (1998). Computation of seismograms and atmospheric oscillations by normal-mode summation for a spherical earth model with realistic atmosphere. Geophysical Journal International, 135(2), 388-406. doi: 10.1046/j.1365-246X.1998.00665.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51352
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:06 Nov 2014 20:29
Last Modified:06 Nov 2014 20:29

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