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 STAUDER, W. Search for Related Content GeoRef GeoRef Citation

Three Kamchatka earthquakes

INSTITUTE OF TECHNOLOGY, SAINT LOUIS UNIVERSITY,, ST. LOUIS, MISSOURI,
SEISMOGRAPHIC STATION, UNIVERSITY OF CALIFORNIA,, BERKELEY, CALIFORNIA

Abstract

Three earthquakes, two with previously determined fault-plane solutions, are selected in order to study the relation between the S waves and the source mechanism. The S waves are observed at favorable epicentral distances at stations distributed in all quadrants about the epicenter. The earthquakes are of a focal depth of 40 to 60 kilometers and belong to the aftershock sequence of the great earthquake of November 4, 1952. The direction of first motion and the plane of polarization of S are determined by the construction of particle-motion diagrams.

In the case of the two earthquakes for which the fault-plane solutions have been published, no correspondence is found between the observed S wave data and the character of the S motion expected on the basis of the given nodal planes of P, whether the source be considered as a single couple or as a double couple. For the third earthquake it is found that the first motion of P is compressional along all rays leaving the focus downward and that the S waves are strongly SV polarized. No faulting mechanism can explain this distribution of the motion in the initial P and S phases. The motion is explained as corresponding to that generated by a simple force acting almost vertically downward. Graphical and analytical techniques of analysis determine the trend of the force at the source to be N 12° W, with a plunge of 85°. A reconsideration of the other two shocks shows that these, too, are better explained by a simple force source than by a faulting mechanism.

Footnotes

Condensed from a Ph.D. dissertation on file in the Library of the University of California.

This article has been cited by other articles:

				D. ENESCU, A. GEORGESCU, D. JIANU, and I. ZaMARCa Theoretical model for the process of underground explosions. Contributions to the problem of the separation of large explosions from earthquakes Bulletin of the Seismological Society of America, June 1, 1973; 63(3): 765 - 785. [Abstract] [PDF]

				F. F. EVISON On the occurrence of volume change at the earthquake source Bulletin of the Seismological Society of America, February 1, 1967; 57(1): 9 - 25. [Abstract] [PDF]

				R. F. MEREU A study of apparent angles of emergence at Marathon Ontario from the Lake Superior data Bulletin of the Seismological Society of America, April 1, 1965; 55(2): 405 - 416. [Abstract] [PDF]

				A. Udias, A. UDIAS, and W. STAUDER Application of numerical method for S-wave focal mechanism determinations to earthquakes of Kamchatka-Kurile Islands Region Bulletin of the Seismological Society of America, December 1, 1964; 54(6A): 2049 - 2065. [Abstract] [PDF]

				T. HIRASAWA and W. STAUDER Spectral analysis of body waves from the earthquake of February 18, 1956 Bulletin of the Seismological Society of America, December 1, 1964; 54(6A): 2017 - 2035. [Abstract] [PDF]

				H. D. FARA A new catalogue of earthquake fault plane solutions Bulletin of the Seismological Society of America, October 1, 1964; 54(5A): 1491 - 1517. [Abstract] [PDF]

				A. E. STEVENS Earthquake mechanism determination by S-wave data Bulletin of the Seismological Society of America, April 1, 1964; 54(2): 457 - 474. [Abstract] [PDF]

				R. E. INGRAM Focal mechanism of couples without moment Bulletin of the Seismological Society of America, July 1, 1963; 53(4): 817 - 820. [Abstract] [PDF]

				W. STAUDER S-Wave studies of earthquakes of the North Pacific, Part I: Kamchatka Bulletin of the Seismological Society of America, July 1, 1962; 52(3): 527 - 550. [Abstract] [PDF]

				A. S. FURUMOTO The use of ScS-wave data in focal mechanism determinations Bulletin of the Seismological Society of America, July 1, 1962; 52(3): 551 - 572. [Abstract] [PDF]

				W. STAUDER and A. W. M. A comparison of some S-wave studies of earthquake mechanisms Bulletin of the Seismological Society of America, April 1, 1961; 51(2): 277 - 292. [Abstract] [PDF]

				O. NUTTLI The effect of the earth's surface on the S wave particle motion Bulletin of the Seismological Society of America, April 1, 1961; 51(2): 237 - 246. [Abstract] [PDF]

				W. STAUDER S waves: Alaska and other earthquakes Bulletin of the Seismological Society of America, October 1, 1960; 50(4): 581 - 597. [Abstract] [PDF]