ML20137D598

Requests Response to Listed Queries Re micro-earthquake Activity Near Plant Site

ML20137D598
Person / Time
Site:	North Anna, 05000000
Issue date:	01/04/1978
From:	Allen J NORTH ANNA ENVIRONMENTAL COALITION
To:	Reiter L Office of Nuclear Reactor Regulation
Shared Package
ML20136A555	List: IA-85-363, Submits Topics for Discussion at Commission 830708 Meeting W/Acrs.Topics Include Seismic Design Margins ML20136A550 ML20136E176 ML20136E418 ML20136E423 ML20136E621 ML20136E929 ML20136F618 ML20137D336 ML20137D440 ML20137D455 ML20137D472 ML20137D477 ML20137D494 ML20137D511 ML20137D540 ML20137D551 ML20137D557 ML20137D562 ML20137D570 ML20137D576 ML20137D583 ML20137D588 ML20137D598 ML20137D601 ML20137D609 ML20137D616 ML20137D621 ML20137D627 ML20137D635 ML20137D641 ML20137D646 ML20137D652 ML20137D659 ML20137D665 ML20137D670 ML20137D849 ML20137D867 ML20137D881 ML20137D911 ML20137D924 ML20137D951 ML20137D978 ML20137E016 ML20137E026 ML20137E044 ML20137E056 ML20137E075 ML20137E098 ML20137E113 ... further results
References
FOIA-85-363 NUDOCS 8508220520
Download: ML20137D598 (2)

Text

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January la , 1978 P.O. DOX 3951 Cl!ARLOTTESVILLE, VIICINIA 2290:

Ftr. Iron llei t er, Seismologi'st (717 J533.-704 or (80a)293-6039

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Geosciences !! ranch Division o f Si te Sa fety anul 1:nvironmental Analysis U.S. Nuc l ea r itegis la t ory Commi ssi on

%ashington, D. C. 20W3

Dear bir. Itei t e r:

The North Anna Environmental Coalition rec;pectfully requests that you answer the foilowing questions at your earlient convenience:

(Re lleiter Af fidavi t of July 13, 1977)

1.  % hat work isthe Geosciences liranch doing to determine why "there is more act ivity (micro-seismic) along the lake shores" at North Anna?

2. You write ttjat "there is no evidence that micro-carthquakOf t AMurring elsewhere along Acuschel's lineament," and argue against its being seismically active. Does not the cluster of 16 8 micro-earth-quakes strongly suggest that at the point where the lineament intersects the lake, it has been activated by the weight of the water?

3 Do you agree with seismologist Seth Coplan that fault lubrication and reactivation is not a function of fault age? Given that, does not the

" historical" record of activity along Neuschel's lineament bi'come irrelevant in terms of assessing the current water-induced activity?

1 1 When you st ate that carthquake activity at North Anna "is not a t a ll regionally anomalous," what in the source of your data for the comparison?

If " Jack of instrumentation" has deprived you of base-line figures, and micro-earthquake monitoring installations einenhore are rare, how did you ar-rive at a standard of what was " regionally anom-alous" or regionally normal?

5. Where else in Virginia have you found comparable clusters of la6 micro-carthquakes?

6. bhore in the seinmological li t e ra t u re a re there examples of 30-year seismic predictions succesn-fully made on the banis of 3 years of micro-seismic monitoring?

7  % hat is the upper limit registered by the network?

What was the date or daten of the two carthquaken in the cluster which regintes ed a magnittulo of greater than 27 Thank you for your professional assintance.

G500220520 850722 POR FOIA June A Ilen DELLOS-363 PDR President, NAF.C cc th p. .lohn Slens Sen. Gary llart

[h? ORTH ANNq ENViRONMENML COALMO)

Janua ry la , 1978 P.O. BOX 3951 CilARLOTTESVILLE, VIRGINIA 229 '

Mr. lxon Heiter, Seismologist (71?J533-7694 or (80 fe)293-60:

Geosciences 11 ranch Division of Site Safety and Environmental Analysis U.S. Nuclear llegulatory Commission Washington, D. C. 20555

Dear Mr. Ileiter:

The North Anna Environmental Coalition respectfully requests that you answer the following questions at your i

earliest convenience:

(He Reiter Af fidavit of July 13, 1977)

1. What work is the Geosciences Branch doing to determine why "there is more activity (micro-

seismic) along the lake shores" at North Anna?

l 2. You write ttgat "there is no evidence that micro-carthquakO215"Neurring elsewhere along ficuschel's lineament," and argue against its being seismically active. Does not the cluster.of 16 micro-earth-6 l quakes strongly suggest that at the point whero the lineament intersects the lake, it has been activated by the weight of the water?

3 Do you agree with seismologist Seth Coplan that fault lubrication and reactivation is not a L

function of fault age? Given that, does not the

" historical" record of activity along Neuschel's l lineament become irrelevant in terms of assessing i

the current water-induced activity?

f 1 1 When you state that earthquake activity at North l Anna "is not a t all regionally anomalous," what I

is the source of your data for the comparison?

l If " lack of instrumentation" has deprived you of I base-line figures,and micro-earthquake monitoring j installations elsewhere are rare, how did you ar-I rive at a standard of what was " regionally anom-I alous" or regionally normal?

5. Where else in Virginia have you found comparable clusters of le6 micro-earthquakes?

6 Where in the seismological literature are there

examples of 30-year seismic predictions success-i fully made on the basis of 3 years of micro-seismic monitoring?

7 What is the upper limit registered by the network?

What was the date or dates of the two earthquakes in the cluster which registered a magnitude of greater than 2?

Thank you for your professional assistance.

incerely, i sne A llen

• President, NAEC cc: liep. John Moss Sen. Gary llart i