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Progress of Urbanization and Base Problems (1962)-Showa 64 (1989)

Last Updated March 8, 2019

Progress of urbanization and base burden

A sit-in demanding land return
At the Kami-Seya Communication Facility, a sit-in protest of the restrictions on radio interference prevention and satisfactorily seeking land return. (1961)

With the rapid progress of urbanization during the period of high economic growth from the late 1930s, the problem of bases became apparent.


Muraame Bridge Incident
The "Mura-Amebashi Incident" was blocked by the transport of tanks loaded from Yokohama North Dock. (1972)

At the Kami-Seya Communication Facility, the use of equipment and the construction of buildings around the facility were severely restricted in order to prevent U.S. military reception problems. In addition, transmission from Fukaya communication station caused TV reception problems in the surrounding area. The radio interference prevention restricted area of the Kamiseya communication facility was abolished in 1995, but has placed a burden on citizens' lives for many years.


Panoramic view of Yokohama Seaside Residential Area
A panoramic view of the Yokohama Seaside Residential Area located in Shinhonmoku. (Around 1981)

In the Yokohama Seaside Residential Area, a campaign for early return and reconstruction led by land owners.
In the midst of such efforts, the United States and the United States have conducted a full-scale review of the U.S. Army facilities and Area Adjustment Plan in 1968, the Negishi Racecourse District (currently Negishi Forest Park), residential areas and related facilities located in urban areas have been returned.


Main Events
ShowaMain Events
37 YearsJanuary 25: Japan-U.S. Agreement on the setting of restricted areas for preventing radio interference in the Kami-Seya Communication Facility
November 1: Defense Facilities Agency established
39 yearsMay 21: Kanagawa Prefectural Base-related Prefectural Municipal Liaison Council formed
40 YearsFebruary 7: Launch of North Bombing in Vietnam
43 YearsDecember 23: Japan-US Agreement on U.S. Army Facilities and Area Coordination Plan
44 YearsMarch 27: Japan-US agreement to return the Yokohama Seaside Residential Area (No. 1) and Yamate residential area
June 30: Return of Yokohama soldier Club
November 23: Return of Negishi Racecourse District
45 yearsDecember 21: Japan-US Agreement on reorganization and integration of U.S. Forces in Japan
46 YearsFebruary 17: Return of Tomioka Warehouse Area (part)
47 YearsFebruary 9: Return of the Yamate residential area
May 15: Return to Okinawa
August 5: Muraame Bridge Incident
August 25: Return of Kishine Barracks Area

U.S. military incidents, accidents and noise problems

U.S. military aircraft crashed in Midori Ward
A U.S. military aircraft crashed in Eda-cho, Midori-ku (now Eda-Kita, Aoba-ku), killing young children. (1977)

In 1973, the take-off and landing of aircraft carrier-based aircraft that started using the Atsugi base in 1973, together with the night continuous take-off and landing training (NLP), which began in 1982, made the noise damage caused by U.S. military aircraft.


No. 306 tank at Tsurumi Oil Storage Facility, which was burned due to lightning strike
No. 306 tank at Tsurumi Oil Storage Facility, which was burned by lightning strike. (1979)

The U.S. military jet crash in 1977 was a catastrophe that killed citizens' precious lives. Tank fires occurred one after another at two oil storage facilities that handle jet fuel from U.S. military aircraft, and the explosion and fire accident at the Koshiba oil storage facility caused extensive damage to nearby houses.


At the Koshiba Oil Storage Facility, the No. 6 tank (underground tank) exploded and burned.
At the Koshiba Oil Storage Facility, the No. 6 tank (underground tank) exploded and burned. (1981)

With urbanization, incidents and accidents by the U.S. military and noise from U.S. military aircraft have become even more compelling problems, Yokohama City has been working with Kanagawa Prefecture and base-related cities in the prefecture, including the transfer of aircraft carrier-based aircraft. We are working with the government and the U.S. Army to drastically solve noise problems and ensure thorough safety measures.


Main Events
ShowaMain Events
48 YearsJanuary 23: Japan-US agreement on the Kanto Air Force Facility Consolidation Plan, etc.
September 27: Start of use of aircraft carrier-based aircraft at Atsugi base
50 YearsApril 30: End of the Vietnam War
1952September 27: U.S. military jet crash (Eda-cho, Midori-ku)
December 15: Japan-US agreement to return the Yokohama Seaside Residential Area (No. 2), Negishi Residential Area (partly), Shinyamashita Residential Area, Yokohama Chapel Center
1954July 27: A fire accident at Tsurumi Oil Storage Facility
1956October 13: Explosion of Koshiba Oil Storage Facility
1957February 16: The first NLP implementation at Atsugi Base
March 31: Yokohama Seaside Residential Area, Shinyamashita Residential Area, Negishi Residential Area (part) Return
60 yearsMay 31: Establishment of a Special Committee for the Promotion of Requisition of Yokohama City Council
1962January 20: Launch of Aircraft Accident Liaison Council
1963August 16: Established the Atsugi Base Noise Countermeasures Council

For inquiries to this page

Policy Bureau Base Countermeasures Section

Phone: 045-671-2168

Phone: 045-671-2168

Fax: 045-663-2318

Email address: ss-kichitaisaku@city.yokohama.jp

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Page ID: 220-124-154

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