28977049.pdf

PROJECT 10073 RECORD CARD

|  1. DATE | 19 February 1958 | 2. LOCATION | Hokkaido, Japan  |
| --- | --- | --- | --- |
|  3. DATE-TIME GROUP | Local GMT 19/0059Z | 4. TYPE OF OBSERVATION | ☑ Ground-Visual ☐ Air-Visual ☐ Air-Intercept Radar  |
|  5. PHOTOS | ☐ Yes Sketch ☑ No | 6. SOURCE | Military  |
|  7. LENGTH OF OBSERVATION | 2 hours | 8. NUMBER OF OBJECTS | one  |
|  9. COURSE | stationary | 10. BRIEF SUMMARY OF SIGHTING | Radar report from Sea of Japan area. Return developed rapidly to a dense cloud that expanded to cover an area approximately 65 miles long and rose from an altitude of 3,…

UNCLASSIFIED

Set 1/1, Card 3/3 USSR MC#: 23469
Rpt #: IR-100-58

3 Incls
1. Overlay
2. Scope presentation
3. Source's original report, 2 cys with incl 1 & 2, 1 cy each
4B4 Annotation: 3 Incls Received

May 26, 1958

DOWNGRADED AT 3 YEAR INTERVALS:
DECLASSIFIED AFTER 12 YEARS
DOD DIR 5280.10

Classification Cancelled
(or changed to UNCLASS)
Auth. Quintanilla, LT COL, USAF
By HART (UP)
Date 24 Jan 69
LFR 203-1 para 1-12b

UNCLASSIFIED

Country: USSR UNCLASSIFIED
Subject: Unusual Radar Sighting Associated With Russian Aircraft Activity
Source: Det #45, 613th AC&W Sqdn APO 181, San Francisco, California
Preparing Officer: ROBERT C. LAIDLAW, Capt, USAF
Set 1/1, Card 1/3
Info Spec: DE/MT/smh
Distr: 4E1/4E1a-6 cys/4E1d-3 cys/4F2/4B/4E4g

ET/Rel: UK and ACZ
MC #: 23469
AF #: 1165758
Rpt #: IR-100-58
Agency: Hq 39th Air Div Misawa AB Japan
D.R.: February 27, 1958
D.I.: February 19, 1958
Eval: B-2
Ref: None Given

41EH
10DW
13

Entire Document

While conducting surveillance of Russian aircraft on 19 Feb 58 at 0059Z, operations p…

UNCLASSIFIED

Set 1/1, Card 2/3
DSSR
Lt #: 23469
Rpt #: IR-100-58

65 miles long from 44°10 min north 137°10 min east to 45°30 min north 137°40 min east and approximately 25 miles across which rose from an altitude of 3,000 feet to a final altitude of 46,000 feet. The return was similar to a weather return except for the speed of its development. It appeared at 0059Z and dissipated at 0300Z. All five Russian aircraft tracks in the area proceeded to the general vicinity of this phenomenon. Observers were unable to describe the return and associated Russian reaction in terms of any previous expe…

Country: Japan/USSR
Subject: Luminous Sightings off the Hokkaido Coast
Source: Maritime Safety Board
Preparing Officer: Anthony M. Pereira, Capt. USAF
Set 1/1, Card 1/3

UnCLASSIFIED
MC #: None
AF #: 1170908
Rpt #: IR-1886-58
Agency: 6004th Air Intel Sv Sq
D.R.: April 2, 1958
D.I.: March 8, 1958
Eval: B-3

Info Spec: DE/nd
Distr: 4Eig/4F3-3 cys/4P1a
Entire Document

Summary:
1. The information contained in this report was obtained from Mr. Noboru ITO, Chief of the Aviation Administration Section and Mr. Toru SAHARA, Chief of the No. 2 Security Section, MARITIME SAFETY BOARD, as reported to the…

Set 1/1, Card 2/3 Japan/USSR MC #: None 7
Rpt #: IR-1886-58

6004th AISS, visited Noboru ITO, Chief of the Aviation Administration Section
and Toru SAHARA, Chief of the No. 2 Security Section, MARITIME SAFETY BOARD
(MSA) for information on an alleged explosion off the SIBERIAN coast on 19
February 1958.

2. Recently, three unknown luminous sightings were made off the coast
of HOKKAIDO by fishermen and reported to MSA. MSA has recorded these inci-
dents but will not investigate the matter further. In each instance the
sighting was made at night. There is no report indicating an explosion off
th…

Set 1/1, Card 3/3 Japan/USSR MC #: None 7
Rpt #: IR-1886-58 5

COMMENTS OF THE PREPARING OFFICER:

(5) At approximately 0959 hours (JST) on 19 February 1958 an unknown phenomena, believed to have been an explosion, was detected at 4430N/13730E at a US radar site in JAPAN. The phenomena lasted approximately two hours. This office checked with the Meteorological Agency for barometric or seismic data on the premise that an explosion was detonated. It was learned that there were no barometric or seismic changes indicative of an explosion at the above time. Negative information was also obtained fr…