Constituent energy of regional seismic coda

Tae Kyung Hong, William Menke

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Seismic coda is composed of scattered wavelets originated from various heterogeneities. The phase composition of regional seismic coda still remains unknown, despite its use for several decades. This is caused partly because the ray paths of scattered wavelets in coda are not on the great-circle path between a source and receiver. We examine the constituent original phases of regional coda with the help of a source-array analysis. A set of uniform sources that are essential for a source-array analysis is organized with underground nuclear explosions. Strong Rg-origin energy is observed in the coda at frequencies of 0.2-0.8 Hz, and it lasts more than 700 sec until the end of records. The coherent energy in the coda reduces with frequency. It constitutes about 20% of the total coda energy at frequencies of 0.2-0.4 Hz, and 12% at frequencies of 0.4-0.8 Hz. The other 80% of coda energy in 0.2-0.8 Hz is mixed with complex phases from various untraceable origins. The Rg energy is the most influential component in the construction of low-frequency regional coda. On the other hand, the coda at higher frequencies, 0.8-3.2 Hz, is observed to be mixed with complex phases that cause the wave field to be diffused. The observation of Rg-origin energy at the regional coda suggests that scattered energy from phase coupling of Rg is not significant compared to Rg-to-Rg scattered energy.

Original languageEnglish
Pages (from-to)454-462
Number of pages9
JournalBulletin of the Seismological Society of America
Volume98
Issue number1
DOIs
Publication statusPublished - 2008 Feb 1

Fingerprint

Underground explosions
Nuclear explosions
coda
Phase composition
energy
underground explosions
great circles
wavelet
nuclear explosions
nuclear explosion
rays
receivers
wave field
low frequencies

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

@article{75fd11f03f7f49ea84d5197fb92a6536,
title = "Constituent energy of regional seismic coda",
abstract = "Seismic coda is composed of scattered wavelets originated from various heterogeneities. The phase composition of regional seismic coda still remains unknown, despite its use for several decades. This is caused partly because the ray paths of scattered wavelets in coda are not on the great-circle path between a source and receiver. We examine the constituent original phases of regional coda with the help of a source-array analysis. A set of uniform sources that are essential for a source-array analysis is organized with underground nuclear explosions. Strong Rg-origin energy is observed in the coda at frequencies of 0.2-0.8 Hz, and it lasts more than 700 sec until the end of records. The coherent energy in the coda reduces with frequency. It constitutes about 20{\%} of the total coda energy at frequencies of 0.2-0.4 Hz, and 12{\%} at frequencies of 0.4-0.8 Hz. The other 80{\%} of coda energy in 0.2-0.8 Hz is mixed with complex phases from various untraceable origins. The Rg energy is the most influential component in the construction of low-frequency regional coda. On the other hand, the coda at higher frequencies, 0.8-3.2 Hz, is observed to be mixed with complex phases that cause the wave field to be diffused. The observation of Rg-origin energy at the regional coda suggests that scattered energy from phase coupling of Rg is not significant compared to Rg-to-Rg scattered energy.",
author = "Hong, {Tae Kyung} and William Menke",
year = "2008",
month = "2",
day = "1",
doi = "10.1785/0120070121",
language = "English",
volume = "98",
pages = "454--462",
journal = "Bulletin of the Seismological Society of America",
issn = "0037-1106",
publisher = "Seismological Society of America",
number = "1",

}

Constituent energy of regional seismic coda. / Hong, Tae Kyung; Menke, William.

In: Bulletin of the Seismological Society of America, Vol. 98, No. 1, 01.02.2008, p. 454-462.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Constituent energy of regional seismic coda

AU - Hong, Tae Kyung

AU - Menke, William

PY - 2008/2/1

Y1 - 2008/2/1

N2 - Seismic coda is composed of scattered wavelets originated from various heterogeneities. The phase composition of regional seismic coda still remains unknown, despite its use for several decades. This is caused partly because the ray paths of scattered wavelets in coda are not on the great-circle path between a source and receiver. We examine the constituent original phases of regional coda with the help of a source-array analysis. A set of uniform sources that are essential for a source-array analysis is organized with underground nuclear explosions. Strong Rg-origin energy is observed in the coda at frequencies of 0.2-0.8 Hz, and it lasts more than 700 sec until the end of records. The coherent energy in the coda reduces with frequency. It constitutes about 20% of the total coda energy at frequencies of 0.2-0.4 Hz, and 12% at frequencies of 0.4-0.8 Hz. The other 80% of coda energy in 0.2-0.8 Hz is mixed with complex phases from various untraceable origins. The Rg energy is the most influential component in the construction of low-frequency regional coda. On the other hand, the coda at higher frequencies, 0.8-3.2 Hz, is observed to be mixed with complex phases that cause the wave field to be diffused. The observation of Rg-origin energy at the regional coda suggests that scattered energy from phase coupling of Rg is not significant compared to Rg-to-Rg scattered energy.

AB - Seismic coda is composed of scattered wavelets originated from various heterogeneities. The phase composition of regional seismic coda still remains unknown, despite its use for several decades. This is caused partly because the ray paths of scattered wavelets in coda are not on the great-circle path between a source and receiver. We examine the constituent original phases of regional coda with the help of a source-array analysis. A set of uniform sources that are essential for a source-array analysis is organized with underground nuclear explosions. Strong Rg-origin energy is observed in the coda at frequencies of 0.2-0.8 Hz, and it lasts more than 700 sec until the end of records. The coherent energy in the coda reduces with frequency. It constitutes about 20% of the total coda energy at frequencies of 0.2-0.4 Hz, and 12% at frequencies of 0.4-0.8 Hz. The other 80% of coda energy in 0.2-0.8 Hz is mixed with complex phases from various untraceable origins. The Rg energy is the most influential component in the construction of low-frequency regional coda. On the other hand, the coda at higher frequencies, 0.8-3.2 Hz, is observed to be mixed with complex phases that cause the wave field to be diffused. The observation of Rg-origin energy at the regional coda suggests that scattered energy from phase coupling of Rg is not significant compared to Rg-to-Rg scattered energy.

UR - http://www.scopus.com/inward/record.url?scp=40549142141&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=40549142141&partnerID=8YFLogxK

U2 - 10.1785/0120070121

DO - 10.1785/0120070121

M3 - Article

AN - SCOPUS:40549142141

VL - 98

SP - 454

EP - 462

JO - Bulletin of the Seismological Society of America

JF - Bulletin of the Seismological Society of America

SN - 0037-1106

IS - 1

ER -