HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by KVAMME, L. B. Articles by HAVSKOV, J. Search for Related Content GeoRef GeoRef Citation

Q in southern Norway

SEISMOLOGICAL OBSERVATORY, ALLEGT. 41, N-5000 BERGEN, Norway

Abstract

Q was determined for the southern Norway region using short-period data from local events. The spectral ratio and the coda decay method were used to determine Q as a function of frequency for P, S, and coda waves, respectively. Q(f) was generally found to fit the relationship Q = Q_of^m where f is the frequency and Q_o and m constants. The following results were obtained:

where Q_c, Q_p, and Q_s are coda Q, Q of P waves, and Q of S waves, respectively. There is a good agreement between coda Q and spectral ratio Q_s values, which supports the hypothesis that coda waves are backscattered S waves. The increase in coda Q as a function of window length is thought to reflect an increase of Q with depth, because coda waves for a longer time window will sample deeper parts of the crust. At higher frequencies (12 to 15 Hz), our results are quite similar to what has been found for the Canadian Shield area, but with a much stronger frequency dependence. This could be interpreted in terms of a stronger presence of scatterers in southern Norway as compared to the Canadian Shield.

Footnotes

^* Present address: NORSAR, P.O. Box 51, N-2007, Kjeller, Norway.

This article has been cited by other articles:

				S. Mukhopadhyay, J. Sharma, R. Massey, and J. R. Kayal Lapse-Time Dependence of Coda Q in the Source Region of the 1999 Chamoli Earthquake Bulletin of the Seismological Society of America, August 1, 2008; 98(4): 2080 - 2086. [Abstract] [Full Text] [PDF]

				Source Parameter Scaling for Small Earthquakes Observed at the Western Nagano 800-m-Deep Borehole, Central Japan Bulletin of the Seismological Society of America, October 1, 2004; 94(5): 1781 - 1794.

				Attenuation of High-Frequency P and S Waves in the Crust of Choongchung Provinces, Central South Korea Bulletin of the Seismological Society of America, June 1, 2004; 94(3): 1070 - 1078.

				Attenuation of High-Frequency P and S Waves in the Crust of Southeastern South Korea Bulletin of the Seismological Society of America, December 1, 2001; 91(6): 1867 - 1874.

				P. M. Hatzidimitriou S-wave attenuation in the crust in northern Greece Bulletin of the Seismological Society of America, October 1, 1995; 85(5): 1381 - 1387. [Abstract] [PDF]

				Y. FUKUSHIMA, S. KINOSHITA, and H. SATO Measurement of Q-1 for S waves in mudstone at Chikura, Japan: Comparison of incident and reflected phases in borehole seismograms Bulletin of the Seismological Society of America, February 1, 1992; 82(1): 148 - 163. [Abstract] [PDF]

				A. ALSAKER, L. B. KVAMME, R. A. HANSEN, A. DAHLE, and H. BUNGUM The ML scale in Norway Bulletin of the Seismological Society of America, April 1, 1991; 81(2): 379 - 398. [Abstract] [PDF]