ML20236B356

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Summarizes 761116 Telcon W/J Brune Re Possible Affects of Beaming of Seismic Energy Towards Plant from Rupture Along Hosgri Fault
ML20236B356
Person / Time
Site: Diablo Canyon, 05000000
Issue date: 11/29/1976
From: Hofmann R
Office of Nuclear Reactor Regulation
To: Allison D
Office of Nuclear Reactor Regulation
Shared Package
ML20236A877 List: ... further results
References
FOIA-87-214 NUDOCS 8707290077
Download: ML20236B356 (2)
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NCV 2 91976 MEMORANDUM FOR: Dennis Allison, LPM, Light Water Rem.cors Branch #1, DPM FROM: Renner Hofmann, Leader, Geology Section, GSB, DSE

SUBJECT:

REGARDING TELEPHONE CALL OF NOVEMBER 16, 1976 TO DR. JAMES BRUNE OF THE SCRIPPS INSTITUTE OF OCEANOGRAPHY My phone call to Dr. Brune concerned his recent letter regarding the possible affects of beaming of seismic energy towards Diablo Canyon from a rupture along the Hosgri fault based upon theoretical work not referenced in his letter.  !

Dr. Brune said that the reference by Beniof f, in which he proposed that  ;

such a mechanism may have been responsible for certain areas of increased damage in the vicinity of the Kern County 1965 Earthquake, appears in '

the California Division of Mines Bulletin 171. He stated further that there were several theoretical articles which touched upon the subject. One of them is by Ralph Archuleta in the bulletin of the Seismological Society of America,1975 Volume 65 No. 5 for October.  !

Another article he mentioned is by Paul Richards entitled "Self j Similar Rupture Propagation, Dynamic Motions near an Earthquake i Fault: A Three Dimensional Solution." This either has appeared or j will appear in the Seismological Society of AmericanBulletin. He did not have a reference at this time. Another reference was paper 296 of the Fif th World Conference on Earthquake Engineering entitled " Dynamic Properties Earthquake Source." Still another reference by author Paul Richards, appears in the 1973 International Journal of Solids and Structures, Volume 9 pages 843-861 " Dynamic Field of Growing Plan Elliptical Shear Crack." Also, there is the paper by Brune in a book edited by Rosenbluth and Lomnitz, with a title sonething like i " Earthquake Risk." It is a new book.

Dr. Brune has stated that this subject would be discussed in a paper at the west coast American Geophysical Union Meeting in the week of 4 December 6,1976 given by Jerry Frazier and Ralph Archuleta based on numerical modeling. He said they did not have a pre-print this time but should they prepare one before the meeting, he would send it.
He also referred me to his past papers written concerning modeling of a

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f ault movements in foam rubber. Of fhand, I do not know what they {

! are. I do recall having seen them probably in the American Geophysical a I

Union Journals or Seismological Society Bulletin.

I The proposed beaming of high energy is extremely theoretical. The

! question of the appropriateness of foam rubber as in anology to i the real earth is questionable in developing any kind of quantative I results. The theoretical modeling requires many assumptions, and the type of mathematical modeling will influence the results. The principal rebutal to this kind of. an attack is the intensity contours around the 1906 San Francisco earthquake of magnitude 8.3 where high '

l. intensities, that is over Modified Mercalli VIII occurred within only about 1 1/2 miles of the f ault. Inasmuch as Diablo Canyon is about 31/2 miles from the Hosgri fault, if such besming does occur one can j argue that it has disapated by the. time it reaches that distance.

Apparently, the principal of arguments that are going to be used by l Dr. Bruns are those to be put forth by Jerry Frasier and Ralph Archuleta at the AGU meeting. This involves nuesrical modeling with j some form of dynamic finite element analysis. I hope to attend that j

meeting and to talk with Dr. Frasier and Archuleta on the subject.

' Perhaps I can provide more detailed information af ter- that. In the

! mean time, I am trying to locata the various references that Dr. Brune provided.

1 i

Distribution:

Central File NRR Rdg Renner B. Hofmann, Leader .

GSB Rdg Geology Section  !

DSE Rdg Geology and Seismology. Branch l Division of Site Safety and Environmental Analysis cc: J.: Stepp R. Hofmann

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