DOI: 10.1785/bssa0570061245. Love wave spectra and the mechanism of the 1966 Parkfield sequence

Love wave spectra and the mechanism of the 1966 Parkfield sequence

10.1785/bssa0570061245

Crossref journal-article

Seismological Society of America (SSA)

Bulletin of the Seismological Society of America (790)

Abstract

AbstractThe spectra of the Love waves from five earthquakes of the 1966 Parkfield sequence, recorded at Berkeley, have been studied for evidence of source propagation. Independent field evidence suggests that the source of the main shock of the sequence may have propagated on a line away from Berkeley. The modulation effect of propagation on the amplitude spectrum is discussed. This effect is dependent upon the total time delay due to rupture down the fault and seismic wave propagation back to the point of initial rupture, and is thus ambiguous with respect to fault rupture velocity and fault length. Consideration of a frequency dependent phase velocity can resolve this ambiguity. The amplitude spectrum of the largest (M = 5.5) Parkfield earthquake shows sharp minima at periods where the spectra of the other four shocks are relatively smooth. Considered individually, these minima are consistent with a fault rupture length of about 30 km and a rupture velocity of 2.2 km/sec. The pattern of the minima varies from that predicted by the assumed phase velocities, thus the rupture velocity/fault length ambiguity is not resolved. Similarity in the shape of the spectra of the four smaller (M = 3.8-5.1) events suggests similar focal dimensions for these earthquakes. The Love wave amplitude spectra of the four smaller earthquakes scale well, at intermediate periods, to the magnitudes determined on standard short-period intruments; the main shock scales to a much higher magnitude. The spectra are considered in the light of proposed seismic scaling laws.

Bibliography

Filson, J., & McEvilly, T. V. (1967). Love wave spectra and the mechanism of the 1966 Parkfield sequence. Bulletin of the Seismological Society of America, 57(6), 1245â1258.

Authors 2

John Filson (first)
Thomas V. McEvilly (additional)

References 12 Referenced 24

10.1029/JZ072i004p01217 / J. Geophys. Res. / Scaling law of seismic spectrum by Aki ((1967))
10.1785/BSSA0510030401 / Bull. Seism. Soc. Am. / Radiation of seismic surface waves from finite moving sources by Ben-Menaham ((1961))
10.1029/JZ067i005p01943 / J. Geophys. Res. / Source mechanism from spectra of long-period seismic surface waves, 1. The Mongolian earthquake of December 4, 1957 by Ben-Menaham ((1962))
10.1029/JZ068i018p05207 / J. Geophys. Res. / Source mechanism from spectra of long-period surface waves, 2. The Kamchatka earthquake of November 4, 1952 by Ben-Menaham ((1963))
{'key': '2021071416505985000_BIB5', 'first-page': '905', 'article-title': 'Source mechanism from spectra of long-period seismic surface waves, 3. The Alaska earthquake of July 10, 1958', 'volume': '53', 'author': 'Ben-Menaham', 'year': '(1963)', 'journal-title': 'Bull. Seism. Soc. Am.'} / Bull. Seism. Soc. Am. / Source mechanism from spectra of long-period seismic surface waves, 3. The Alaska earthquake of July 10, 1958 by Ben-Menaham ((1963))
Brown R. Vedder J. (1967). Surface tectonic fractures along the San Andreas fault. U.S. Geologic Survey Professional Paper, 579, 2- 22.
10.1785/BSSA0570061179 / Bull. Seism. Soc. Am. / Accelerograms-Parkfield earthquake by Cloud ((1967))
10.1785/BSSA05406A1811 / Bull. Seism. Soc. Am. / Total energy and energy spectral density of elastic wave radiation from propagating faults by Haskell ((1964))
10.1785/BSSA0560010125 / Bull. Seism. Soc. Am. / Total energy and energy spectral density of elastic wave radiation from propagating faults by Haskell ((1966))
{'key': '2021071416505985000_BIB10', 'first-page': '237', 'article-title': 'On the seismic body waves from a finite moving source', 'volume': '55', 'author': 'Hirasawa', 'year': '(1965)', 'journal-title': 'Bull. Seism. Soc. Am.'} / Bull. Seism. Soc. Am. / On the seismic body waves from a finite moving source by Hirasawa ((1965))
10.1785/BSSA0570061221 / Bull. Seism. Soc. Am. / The Parkfield, California, earthquakes of 1966 by McEvilly ((1967))
10.1029/JZ066i010p03471 / J. Geophys. Res. / Experimental determination of earthquake fault length and rupture velocity by Press ((1961))

Dates

Type	When
Created	4 years, 1 month ago (July 14, 2021, 12:51 p.m.)
Deposited	2 years, 7 months ago (Jan. 4, 2023, 12:42 a.m.)
Indexed	1 year, 4 months ago (April 25, 2024, 1:15 p.m.)
Issued	57 years, 8 months ago (Dec. 1, 1967)
Published	57 years, 8 months ago (Dec. 1, 1967)
Published Online	57 years, 8 months ago (Dec. 1, 1967)
Published Print	57 years, 8 months ago (Dec. 1, 1967)

Funders 0

None

BibTeX

@article{Filson_1967, title={Love wave spectra and the mechanism of the 1966 Parkfield sequence}, volume={57}, ISSN={0037-1106}, url={http://dx.doi.org/10.1785/bssa0570061245}, DOI={10.1785/bssa0570061245}, number={6}, journal={Bulletin of the Seismological Society of America}, publisher={Seismological Society of America (SSA)}, author={Filson, John and McEvilly, Thomas V.}, year={1967}, month=dec, pages={1245–1258} }

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