ML20209C422

Provides Addl Info on 830829 California Earthquake.Usgs Location of Epicenter Is Off Coast in Vicinity of Hosgri Fault.Univ of California at Berkeley Epicenter Is on Land in Vicinity of Nacimento Fault

ML20209C422
Person / Time
Site:	05000000, Diablo Canyon
Issue date:	09/01/1983
From:	Rothman R Office of Nuclear Reactor Regulation
To:	Rolonda Jackson Office of Nuclear Reactor Regulation
Shared Package
ML20150F500	List: IR 05000428/2005002 ML20150F498 ML20150F502 ML20150F508 ML20150F512 ML20150F548 ML20209B103 ML20209B317 ML20209C048 ML20209C418 ML20209C422 ML20209C804 ML20209C841 ML20209C858 ML20209C903 ML20209C914 ML20209C919 ML20209C959 ML20209D260 ML20209D318 ML20209D342 ML20209D443 ML20209D706 ML20209D836 ML20209E546 ML20209E553 ML20209G137 ML20212K939 ML20212K943 ML20212K946 ML20212K951 ML20212K956 ML20212K964 ML20212K968 ML20212K975 ML20212K980 ML20212K991 ML20212K996 ML20212L010 ML20212L019 ML20212L025 ML20212L029 ML20212L036 ML20212L048 ML20212L053 ML20212L060 ML20212L065 ML20212L070 ML20212L078 ML20212L085 ... further results
References
FOIA-86-391 NUDOCS 8309090016
Download: ML20209C422 (2)

Text

,

s "M.

Wi )

~MiliN

.i l '

Y9 k

k SEP 01 S B HEMORANDUM FOR: Robert E. Jackson, Chief Geosciences Branch, DE THRU:

Leon Reiter, Leader Seismology Section, GSB, DE FROM:

Robert L. Rothman, Geophysicist Seismology Section, GSB, DE

SUBJECT:

ADDITIONAL INFORMATION ON THE CALIFORNIA EARTHQUAKE OF AUGUST 29, 1983 As stated in my memorandum of August 30, 1983, the U. S. Geological Survey's location parameters for this earthquake are:

Origin Time 10:10:28.8 GMT Epicenter 35.72*N 121.45' Depth 5 kilometers Magnitude m 5.4 g

b Since that memorandum we have become aware of additional information.

The University of California at Berkeley's location parameters are:

Origin Time 10:10:31.0 GMT Epicenter 35'49.8'N 121* 21.2'W Depth 8 kilometer Magnitude M 5.4 g

The USGS location is off the coast in the vicinity of the Hosgri Fault and the Berkeley location is on land in the vicinity of the Nacimento Fault.

In both cases the location is approximate 50 miles from the Diablo Canyon Nuclear Power plant (DCNPP).

i Pacific Gas and Electricity (PGAE) reports that there was also a smaller earthquake (r.tagnitude M at approximately 05:27 h.4.4) in the same region on Sunday, August 28, D.T.

Neither of these earthquakes was felt in the DCNPP but they both triggered the supplemental seismic instruments.

These instruments trigger at a lower ground motion level than the standard strong motion instruments. PG&E will send copies of the records as soon as they are processed.

e 830901 830909 05000275 g

r' bW

~ '

• 3g

_s..e.,,....

4....

mg roaw sie no,soi sacu on.o OFFICIAL RECORD COPY

• u.s.aco non-4ao. n 5 M

-~

~

- - =

~

- _ _ w':

r: r - -* ~ ~ ' '

\\l

)

N. g'a v.,.,.r,.;;d

_._5. 5l )

Zif4.ir

• • =

g d

. a.q' '

SEP 01. M e,

il Berkeley reports that the earthquake of August 29 was felt along the coast from San Luis Obispo to the San Francisco area. There are no i'

reports of damage.

b Robert L. Rothman, Geophysicist Seismology Section Geosciences Branch, DE e

cc:

H. Denton R. Vollmer J. Knight E. Sullivan L. Chandler H. Schierling DISTRIBUTION:

B. Buckely DOCUMENT CONTROL DESK-GSB Staff GSB RDG D

i

.....ezq........

......n y p....

s.t.

....REJati.gn..

.....LRe.i.%....

• "*>.. 9/1/81........... 9/hB3.......... 9/.I /.8.1....

ac roau m no,eoinacu o 4o OFFICIAL RE' CORD COPY

• u.s. a o

...-4 o. n

..w

.