Bulletin of the Seismological Society of America
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Bulletin of the Seismological Society of America; April 1984; v. 74; no. 2; p. 361-376
© 1984 Seismological Society of America
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by BOATWRIGHT, J.
Right arrow Articles by FLETCHER, J. B.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

The partition of radiated energy between P and S waves

JOHN BOATWRIGHT and JON B. FLETCHER

U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025

Abstract

Seventy-three digitally recorded body waves from nine multiply recorded small earthquakes in Monticello, South Carolina, are analyzed to estimate the energy radiated in P and S waves. Assuming Q{alpha} = Qß = 300, the body-wave spectra are corrected for attenuation in the frequency domain, and the velocity power spectra are integrated over frequency to estimate the radiated energy flux. Focal mechanisms determined for the events by fitting the observed displacement pulse areas are used to correct for the radiation patterns. Averaging the results from the nine events gives 27.3 ± 3.3 for the ratio of the S-wave energy to the P-wave energy using 0.5 <Fi> as a lower bound for the radiation pattern corrections, and 23.7 ± 3.0 using no correction for the focal mechanisms. The average shift between the P-wave corner frequency and the S-wave corner frequency, 1.24 ± 0.22, gives the ratio 13.7 ± 7.3. The substantially higher values obtained from the integral technique implies that the P waves in this data set are depleted in energy relative to the S waves. Cursory inspection of the body-wave arrivals suggests that this enervation results from an anomalous site response at two of the stations. Using the ratio of the P-wave moments to the S-wave moments to correct the two integral estimates gives 16.7 and 14.4 for the ratio of the S-wave energy to the P-wave energy.




This article has been cited by other articles:


Home page
 Bulletin of the Seismological Society of AmericaHome page
J. B. Fletcher and A. McGarr
Moment Tensor Inversion of Ground Motion from Mining-Induced Earthquakes, Trail Mountain, Utah
Bulletin of the Seismological Society of America, February 1, 2005; 95(1): 48 - 57.
[Abstract] [Full Text] [PDF]

Home page
 Bulletin of the Seismological Society of AmericaHome page
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.


Home page
 Bulletin of the Seismological Society of AmericaHome page
Radiated Energy from the 16 October 1999 Hector Mine Earthquake: Regional and Teleseismic Estimates
Bulletin of the Seismological Society of America, May 1, 2002; 92(4): 1256 - 1265.


Home page
 Bulletin of the Seismological Society of AmericaHome page
Lithological Controls on Seismicity in Granitic Rocks
Bulletin of the Seismological Society of America, June 1, 2000; 90(3): 709 - 723.


Home page
 Bulletin of the Seismological Society of AmericaHome page
Determination of Seismic Energy from Lg Waves
Bulletin of the Seismological Society of America, April 1, 2000; 90(2): 483 - 493.


Home page
 Bulletin of the Seismological Society of AmericaHome page
M. L. Jost, T. Busselberg, O. Jost, and H.-P. Harjes
Source parameters of injection-induced microearthquakes at 9 km depth at the KTB Deep Drilling site, Germany
Bulletin of the Seismological Society of America, June 1, 1998; 88(3): 815 - 832.
[Abstract] [PDF]

Home page
 Bulletin of the Seismological Society of AmericaHome page
T. I. URBANCIC and R. P. YOUNG
Space-time variations in source parameters of mining-induced seismic events with M < 0
Bulletin of the Seismological Society of America, April 1, 1993; 83(2): 378 - 397.
[Abstract] [PDF]

Home page
 Bulletin of the Seismological Society of AmericaHome page
S. J. GIBOWICZ, R. P. YOUNG, S. TALEBI, and D. J. RAWLENCE
Source parameters of seismic events at the Underground Research Laboratory in Manitoba, Canada: Scaling relations for events with moment magnitude smaller than -2
Bulletin of the Seismological Society of America, August 1, 1991; 81(4): 1157 - 1182.
[Abstract] [PDF]

Home page
 Bulletin of the Seismological Society of AmericaHome page
S. J. GIBOWICZ, H.-P. HARJES, and M. SCHAFER
Source parameters of seismic events at Heinrich Robert mine, Ruhr Basin, Federal Republic of Germany: Evidence for nondouble-couple events
Bulletin of the Seismological Society of America, February 1, 1990; 80(1): 88 - 109.
[Abstract] [PDF]

Home page
 Bulletin of the Seismological Society of AmericaHome page
G. L. CHOY and R. KIND
Rupture complexity of a moderate-sized (mb 6.0) earthquake: Broadband body-wave analysis of the North Yemen earthquake of 13 December 1982
Bulletin of the Seismological Society of America, February 1, 1987; 77(1): 28 - 46.
[Abstract] [PDF]

Home page
 Bulletin of the Seismological Society of AmericaHome page
J. BOATWRIGHT
Characteristics of the aftershock sequence of the Borah Peak, Idaho, earthquake determined from digital recordings of the events
Bulletin of the Seismological Society of America, October 1, 1985; 75(5): 1265 - 1284.
[Abstract] [PDF]

Home page
 Bulletin of the Seismological Society of AmericaHome page
D. M. BOORE and J. BOATWRIGHT
Average body-wave radiation coefficients
Bulletin of the Seismological Society of America, October 1, 1984; 74(5): 1615 - 1621.
[Abstract] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1984 by the Seismological Society of America.