A Seismic Study of Travel-Time Anomalies, Network Effects and Location Techniques in the Aleutian Islands

Chiburis, E. F.; Racine, D. P. J.

doi:10.21236/ad0884995

1971

DOI: 10.21236/ad0884995

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A Seismic Study of Travel-Time Anomalies, Network Effects and Location Techniques in the Aleutian Islands

E. F. Chiburis¹,

D. P. J. Racine²

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1971

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Refined hypocenters and accurate reliability estimates

Veith

1975

Bulletin of the Seismological Society of America

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A new method of correcting station arrival times for systematic source and station effects has been developed. The method yields source-region/station time (SRST) corrections which have a simple spatial variation and which are valid, in terms of yielding accurate focal depths and relative epicenters, over large areas. The method has been applied to over 200 earthquakes ranging in depth from about 10 to 650 km in the Kurile-Kamchatka-Okhotsk region. Resulting corrections are uniformly valid throughout an area of approximately one million square kilometers. Full utilization of the SRST corrections for the 25 close-in and 149 teleseismic stations was achieved by weighting each station's contribution to the computed hypocenters. The 95 per cent limits on the depth uncertainty cover the pP depth the appropriate percentage of the time regardless of the number or geometry of the stations in the observing network. The SRTS's for the close-in stations describe their arrival-time variations over the entire are structure and thus may be used in model studies to determine the structure and the epicenter bias.

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Refined hypocenters and accurate reliability estimates

Veith

1975

Bulletin of the Seismological Society of America

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A fast epicenter location program

Lomnitz

1977

Bulletin of the Seismological Society of America

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A major simplification of teleseismic epicenter location procedures can be achieved by regression in the space domain. If distance residuals are used instead of travel-time residuals the normal equations become linear. Observations must be weighted by ∂t/∂▵; however, linear weighted regression is extremely fast as compared to unweighted nonlinear regression. The new program features several other innovations; separate estimation of focal depth, self-initialization using the nearest station as trial epicenter, and second-degree approximations to the Herrin tables instead of travel-time tables in core. On the basis of a relocation of event LONGSHOT, the new routine is found to be about ten times faster, absolutely convergent, and more compact than any of the standard programs in current use.

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An Epicenter Study of the Underground Nuclear Explosion Long Shot

Espinosa

1971

J,Phys,Earth

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P wave arrival times from the Long Shot underground nuclear explosion are used to systematically study its hypocenter and origin time. Azimuthal variations are shown to exist. If observations in the range 0•‹<ƒ¢<30•‹ are excluded in the analysis, the epicenter location is strongly biased. The adopted epicenter is 17km NW using 0•‹<ƒ¢<105•‹ observations. The solutions using observations in the ranges 0•‹<ƒ¢<25•‹ and 0•‹<ƒ¢<35•‹ are 11 and 9 km, respectively. •˜1.

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A Seismic Study of Travel-Time Anomalies, Network Effects and Location Techniques in the Aleutian Islands

Cited by 3 publications

References 0 publications

Refined hypocenters and accurate reliability estimates

Refined hypocenters and accurate reliability estimates

A fast epicenter location program

An Epicenter Study of the Underground Nuclear Explosion Long Shot

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