Number of Cell-Phone Base Station That Stopped Operations (By
Telecommunications Carrier )【Number of houses with a blackout (10,000 houses)】【Number of base stations that stopped operation】

Max: Approx. 6,600 bases【The Great East Japan Earthquake (GEJE)】
・Date and time: Around 14:46 on March 11(Friday)
・Maximum seismic intensity (JMA) : 7
・Epicenter : Sanriku offshore【Aftershock of the GEJE whose seismic center is Miyagi
offshore (maximum seismic intensity (JMA): 6 upper )】・Date and time: Around 23:32 on April 7 (Thursday)
・ Maximum value of the damage by this earthquake(base stations being off-the-air )NTT Docomo: approx. 1,200 base stations
KDDI (au): approx. 500 base stations
Softbank: approx. 2,200 base stations
Y!mobile: approx. 200 base stations

Approx. 4,000 base stations
Approx. 3,800 base stations

Softbank
Original data : Materials of the Ministry of Internal Affairs and Communications (MIC)
Source : MIC “White Paper on Information and Communications in Japan 2011”

Sat.Apr.9・・・

Thu.Apr.28・・・

Mon.May.2・・・

Tue.Apr.26・・・

Wed.Apr.27・・・

Mon.Apr.25・・・

Fri.Apr.22・・・

Sun.Apr.24・・・

Thu.Apr.21・・・

Tue.Apr.19・・・

Wed.Apr.20・・・

Mon.Apr.18・・・

Fri.Apr.15・・・

Mon.Apr.18・・・

Thu.Apr.14・・・

Tue.Apr.12・・・

Wed.Apr.13・・・

Mon.Apr.11・・・

Sun.Apr.10・・・

Mon.Apr.11・・・

Fri.Apr.8・・・

Y!mobile

Sat.Apr.9・・・

Thu.Apr.7・・・

Tue.Apr.5・・・

Wed.Apr.6・・・

Fri.Apr.1・・・

Mon.Apr.4・・・

Thu.Mar.31・・・

Tue.Mar.29・・・

Wed.Mar.30・・・

Mon.Mar.28・・・

Fri.Mar.25・・・

Sun.Mar.27・・・

Thu.Mar.24・・・

Tue.Mar.22・・・

Wed.Mar.23・・・

Sun.Mar.20・・・

Mon.Mar.21・・・

Fri.Mar.18・・・

Sat.Mar.19・・・

Fri.Mar.18・・・

Thu.Mar.17・・・

Thu.Mar.17・・・

Wed.Mar.16・・・

Tue.Mar.15・・・

Wed.Mar.16・・・

Tue.Mar.15・・・

Mon.Mar.14・・・

Mon.Mar.14・・・

Sun.Mar.13・・・

NTT East (Fixedline ＋ISDN)

Mon.Mar.14・・・

Sat.Mar.12・・・

Sun.Mar.13・・・

Sat.Mar.12・・・

Fri.Mar.11・・・

Sat.Mar.12・・・

Sat.Mar.12・・・

Sat.Mar.12・・・

Fri.Mar.11・・・

Fri.Mar.11・・・

Approx. 600 base stations

Number of houses with a blackout in the Tohoku
Electric Power Company's service areas

Statistical Database on the Great East Japan Earthquake, Global Centre for Disaster Statistics, IRIDeS, Tohoku Univ.

Detailed Information of the figure on the previous page
Title on the previouspage

Number of Cell-Phone Base Station That Stopped Operations (Bytelecommunications carrier)• Number of station that stopped operations decreased by the progress ofrestoration activities and recovery of power supply.
• The number increased temporarily by the aftershock that was occurred on
April 7, 2011.

Point of displayedcontents

Name of theDetails
sourceof theTitle
sourceURL

Ministry of Internal Affairs and Communications (MIC) “White Paper onInformation and Communications in Japan 2011,” Part 1, Section 1-1 (1) <August,2011>

Details Name of theof the original data
originalTitle
dataURL

MIC “Damage Status by the Great East Japan Earthquake in the Field ofInformation and Communications and Recovery Status So Far”) <June, 2011>

Figure 1-4 Number of Cell-Phone Base Stations That Stopped Operations
http://www.soumu.go.jp/johotsusintokei/whitepaper/ja/h23/pdf/n0010000.pdf

Number of Cell-Phone Base Stations That Stopped Operations
http://www.soumu.go.jp/main_content/000117341.pdf

Keywords

Cell-phone, base stations, Number of base stations that stopped operations, By
telecommunications carrier

Data Number01-102-0104 (Please specify this number when you make any inquiries about
this sheet)
Statistical Database on the Great East Japan Earthquake, Global Centre for Disaster Statistics, IRIDeS, Tohoku Univ.