ML20209D012

Summarizes 840620 Earthquake 20 Miles West of Santa Maria, Ca.Earthquake Plotted on Encl Map & Located 22 Miles South of Facility.Earthquake Felt in Control Room & Triggered Sensitive Secondary Strong Motion Instruments

ML20209D012
Person / Time
Site:	05000000, Diablo Canyon
Issue date:	06/22/1984
From:	Reiter L Office of Nuclear Reactor Regulation
To:	Knight J Office of Nuclear Reactor Regulation
Shared Package
ML082410749	List: ML20209A984 ML20209B531 ML20209B624 ML20209B724 ML20209B847 ML20209B894 ML20209C131 ML20209C225 ML20209C292 ML20209C320 ML20209C516 ML20209C643 ML20209C669 ML20209C675 ML20209C698 ML20209C705 ML20209C710 ML20209C715 ML20209C720 ML20209C836 ML20209C847 ML20209C848 ML20209C876 ML20209C881 ML20209C908 ML20209C921 ML20209C969 ML20209C975 ML20209C981 ML20209C993 ML20209D004 ML20209D012 ML20209D018 ML20209D030 ML20209D038 ML20209D044 ML20209D045 ML20209D071 ML20209D089 ML20209D114 ML20209D127 ML20209D130 ML20209D135 ML20209D139 ML20209D146 ML20209D154 ML20209D211 ML20209D218 ML20209D230 ML20209D235 ... further results
References
FOIA-86-197 NUDOCS 8406260608
Download: ML20209D012 (3)

Text

,

- - ~. _ _ _

j UNITED STATES g

NUCLEAR REGULATORY COMMISSION n

(

j, WASHINGTON, D. C. 20666

%{*. p,/

.JW 2 2 W

- MEMORANDUM FOR: James P. Knight, Assistant Director for Components & Structures Engineering Division of Engineering FROM:

Leon Reiter, Acting Chief Geosciences Branch, DE

~

SUBJECT:

JUNE 20,1984 0FFSHORE CALIFORNIA EARTHQUAKE An earthquake occurred on June 20, 1984 about 32 kilometers (20 miles) west of Santa Maria California. The following information was provided

, by the USGS in Menlo Park, the National Earthquake Information Service, l

NRC Region V and the Incident Response Center.

4 The magnitude 4.0 to 4.1 (M ) earthquake occurred at 19:28 GMT (12:28 PCT; 3:28 EDT). The epicenker was located at 34.93*N,120.76*W and the focal depth was about 6 to 10 kilometers (3.75 to 6.25 miles). This earthquake is plotted on the attached map and is located about 35 kilometers (22 miles) scath of the Diablo Canyon Nuclear Power Plant.

Preliminary indications are that this event occurred in the vicinity of the Hosgri fault system, with the fault plane showing a large component of reverse motion. This location is roughly coincident with the

. magnitude 5.1 earthquake which occurred in May of 1980 and also displayed a reverse fault plane solution.

This earthquake was felt in the control room at Diablo Canyon and triggered the sensitive secondary strong motion instruments at the site, with maximum acceleration being in general less than about 0.01g. The

_ standard strong motion instrumentation did not trigger.

. We will keep you informed if any additional information becomes available regarding this earthquake.

1

/

&/

Leon Reiter, Acting Chief Geosciences Branch Division of Engineering cc: See next page sweanea

. -.. ag.

-e 4

,w y.

m-.

y-

g-

,r

-cae F

f f. k, s.l f. (

"? '

's

[

</.

\\

Nh*

.'h,

~

-#'!'y i

,/

s l i,

.y,

N ', g f *,.,,,, l.

- j q\\

, ~,

3 g e,.=.

j l.)

.' N

. g.

1

.,%' \\'[

O'u

_1..:,\\

'y -f

,,%,. % g. \\u LQ,sna Amm l%,.e.,1

)I.

's ft I

f n.r-u A

w c

os U

/

l E

% l g.

g

% 1..g.-.,

y,[-

.g g

s meM;_u.t4 '.

m.:

\\

N a

i

-t

's =

1;

-t c

A 72

'Q

%% 1 s..s

'NLt[

1.gf-O.

g ;\\

• 2 3

s s.

e..i '.1O c

s.

• s.,f7 s..

.$ g.

-t W

~

3,

s' N%

4;

.j#1 p/

s a.

s f-6 -,4,

% 44 Paeo_

g y..,

9.g i,

1 s

g N

• f%

".N

'I N, #

')

I, '

\\

h y y

~-*o

' s*#a d>

t

//

'37 j

N I

a N,,

g.. f. '.. '-

l8 *.Q i

'N

j.,

\\

,,..%.b

~~~ 'f jN 5 ;'.ll Nir.'

, , N N

\\i_y'.'?.

's.;[.

v - \\

~'

y

\\ '(

'g O ~B",1 Sy O

' s \\ g "-

s

~**y

4. g

..\\. ;

NN

..~ v

.k -s '

,A..

,,.....s;

+..a ee

\\h ~

\\-

l

"::-]*d' A.

S '".6 - g

• V.

-. {:

,L*"*,,.-,, e"' ~

\\

r

(

s

\\

5

\\ '

\\

v

.a pdN

[M~

$~[,bg h ro.

. p.a

/

',L*,8*""*

y 'fCa.a=-*

'e

), i

\\ %

.t '

ek

\\

' fg

\\\\\\\\,[f -

e 1:Tk \\,,,

• ~ ~ ' '

I*

\\\\%

,f i -,

s, h,. k' $'\\' '

'w I \\ b*

\\

'\\.

gs Di d,

i

--w; si c

,=

cT

- -v-___

4.-

p..::. e.

a.3

\\

h, kN 4 ),1, s.' i ' 0..

. k i * )*> " _ si

'h b.

.,r._.

i,,

,h

's s

g,g,. %.

J n

. c,., - s s

g

.., 7-w

. A..s_

.3,t _

.p 4,

b o

=== 6 g,,,e.,,, i.,..g=>.

i

,i 3

.\\ \\ pv g ys,,,,s

. \\

.I l""

T+'

ef,f

'N-g s,\\

y

1. +

d e e

[

\\.

'N Grower

,,.m e a.

• g

. e ';. '.

• g

• g

.,4

\\

.%i $_, D.

Cd'*

,,, g

\\

is

,g Q

4

't,,

s\\

u ^ --*e r %_.

... ~ -w.

=

e.t's

\\ g\\ s s a%v

.b se

• e

.;- ys

. g. F. ;-.

.s

=.-

e as u,

.*s

-\\

• t**'\\

1

)

\\

ge K l?:::.

~

4N.-. ;., %

o \\ 7 -- i -h. ; %

x

/

t.

l/o'D7 c~ '%..

-e{7 J

\\g s...

\\

Y g

f f

• • -** " 'T.

U-$ Q~

l.

• • I~~**

$' ( ***

g

/

/

y, ~~ ^.

( \\,,;, '(~

, d.*,'.%:...h, i,-

j f

• • =

i

~

's

\\

M' s

4 i

s r,*'"

~

'.,, - - =

s t

3

.r.,t,

• g

~ 'f h'

S

't l

-.e,..-

e, I

-;k,' *:. ){

N 1.,g. -

q..:4.s_ ry'

'~

m o" '\\g -(

T A 5,

=

4i

(

\\

d s-

/,,)4

A

\\.

}

-5

./. s (;.., a- %is. (

/

N 3

- m

. s

..t i

g.

Q

';.4

.M g

A-J

• • • o..

, \\

,,.. i..). W.2

/N g

\\

,_ a t

, s.

g

,/

.9

...=*

,/

---

.-,m

\\

of.3

..,,s, 3

-j y

'.)(f,.(.n g

n N

1. )\\ '

..-,,-&

• Q,.

aqr n

M% Lane Casts,W

\\

~ - %,

~

.- e. h

..c

,4 *b. ", "..'.W.=h[ w..

i

' '/[, /9 D.

• ('c.

4 j

~

I

~~

- ~- h.d

,g.g' e%...v-s

-,,.. ' e, N.4 s.

.v s

. ~ -

t

'y.

I).

A N,s.

w.\\

s

Q'.{c

-a- '""';', q,

_W, a'

9 g

~

~

e

."? 'sN.

• • "~'*"

f,,,;.

3; r.

,--- ;_. g

__ -.-. m

~'

s.

~3

,_ ::, e i

. y.*'

v ~~;'-- /

i y

. Q.,,,, ', '; ; }., b,. -. n.

A

.d..,r* s

- '9

, 'g... <

s

.3-

.y;..

t m,. x,.;

J

, ), [ }

A

..