Long period channel waves from records of Friuli (Italy) earthquakes in 1976
Main Article Content
Abstract
We present a study of a group of long period waves excited by the
earthquakes of Friuli (Italy) in 1976 and recorded between longitudinal
and transverse body waves by Long-period seismographs at epicentral
distances up to about 3 000 Km. The spectral analysis has permitted us
to determine periods of the main phases which make up the wave group.
In regard to the longer period phase, which appears first in the recordings,
the velocity obtained by the dromochrones equals 8.4 Km/s. The group
velocity is instead 7.4 Km/s. Such phases have been considered as being
longitudinal channel waves in the astenosphere. Such hypothesis explains
the inconsistencies which had appeared in previous studies on channel
waves in the astenosphere.
earthquakes of Friuli (Italy) in 1976 and recorded between longitudinal
and transverse body waves by Long-period seismographs at epicentral
distances up to about 3 000 Km. The spectral analysis has permitted us
to determine periods of the main phases which make up the wave group.
In regard to the longer period phase, which appears first in the recordings,
the velocity obtained by the dromochrones equals 8.4 Km/s. The group
velocity is instead 7.4 Km/s. Such phases have been considered as being
longitudinal channel waves in the astenosphere. Such hypothesis explains
the inconsistencies which had appeared in previous studies on channel
waves in the astenosphere.
Article Details
How to Cite
1.
ALESSANDRINI B, BIAGI PF, CAPUTO M. Long period channel waves from records of Friuli (Italy) earthquakes in 1976. Ann. Geophys. [Internet]. 1981Nov.25 [cited 2022Oct.2];34(1):225-36. Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4699
Issue
Section
OLD
Open-Access License
No Permission Required
Istituto Nazionale di Geofisica e Vulcanologia applies the Creative Commons Attribution License (CCAL) to all works we publish.
Under the CCAL, authors retain ownership of the copyright for their article, but authors allow anyone to download, reuse, reprint, modify, distribute, so long as the original authors and source are cited. No permission is required from the authors or the publishers.
In most cases, appropriate attribution can be provided by simply citing the original article.
If the item you plan to reuse is not part of a published article (e.g., a featured issue image), then please indicate the originator of the work, and the volume, issue, and date of the journal in which the item appeared. For any reuse or redistribution of a work, you must also make clear the license terms under which the work was published.
This broad license was developed to facilitate open access to, and free use of, original works of all types. Applying this standard license to your own work will ensure your right to make your work freely and openly available. For queries about the license, please contact ann.geophys@ingv.it.