SEISMOGRAPHIC OBSERVATORIES AND INSTRUMENT CHARACTERISTICS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP83-00423R001700690003-5
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 1
• Document Creation Date: November 9, 2016
• Document Release Date: November 23, 1998
• Sequence Number: 3
• Publication Date: January 11, 1955
• Content Type: FORM

IIIFORM TION REPORT
This material contains in St affecting the
National Defense of the U Unit ited d States within the
meaning of the Espionage Laws, Title 18, U.S.C.
PREPARED AND DISSEMINATED BY
Secs. 739 and 794, the transmission or revelation
of which in any manner to an unauthorized per-
CENTRAL INTELLIGENCE AGENCY
son is prohibited by law.
COUNTRY
India
REPORT NO
SUBJECT
Seismographic Observatories and
Qp
Instrument Chsracterist x
DATE DISTRIBUTED
OF PAGES
25X.1A
9
'S
NO. OF ENCLS.
I
SUPPLEMENT TO REPORT #
25X1A6a
PLACE ACQUIRED (By source)
RESPONSIVE TO
00/C-
DATE ACQUIRED (By source)
DATE OF INFORMATION (Date or dates, on or between which,
events or conditions described in report existed)
1952
1952
THIS IS UNEVALUATED INFORMATION
SOURCE
1. In March 1952, 1 received a bulletin from V V Scihoni, Director
25X1 X6
General of the Observatories for the Meteorolog cal Department of
the Government of India. Below is a description, in chart form,
of the location of seismological stations,
the type of instruments
in each, and each instrument's constants.
Period
Paper
Station Instrument Comet. in
Static Mag- Damping
Speed
secs.
nification ratio
tin.
Bombay Milne-Shaw N 12
350
6:1
16.0
Milne -Shaw E 12
350
4:1
8.0
Sprengnether E 7
-
-
30.0
Calcutta Milne-Shag E 12
250
20:1
8.0
Wood-Anderson N 2
870
Critical
30.0
Omori Ewing N 18
32
-
25.4
Omori -Ewing E 19
30
25.4
Colombo Milne-Shaw E 12
250
16:1
8.o
20:1 from 18.1.02
Dehra Dun Omori N 30
12
-
Hyderabad Milne -Shaw E 12
249
20:1
8.0
Milne-Shay N 12
249
20:1
8.0
Hodaikan.a1 Milne-Maw E 10
250
20:1
8.0
New Delhi Milne-Shaw N 12
288
20:1
8.0
Wood-Anderson N t}
1000
20:1
16.0
Wood-Anderson N 2
2000
30:1
60.0
Omori Ewing E 30
30
-
12.0
Poona Milne-Shaw N 12
250
20:1
8.0
Wood-Anderson E
1100
20:1
16.0
Sprengnether E 7.2
-
30.0
Benioff 1.0
Tg
0.28 -
60.o
end .-
-
t
ACT-DATE INH-ip=
NAVY
7 -3
DISTRIBUTION
~5 N
Approved Fpr ReJ , sp 1 99IO9l'4iUl~fQO PP.1 PQ~ ~.QO
This repo rt is for use, wit in t e o Inte igence comp nen s o t e e a en s o _ i c f _ all not be transmitted