Issued on: Reiwa 3, June

The purpose and points to note of this map

Sakura Elementary School Gymnasium
Daini Junior High School Gymnasium

Okata Port

Health Center
Kitanoyama
Community Center
Gymnasium

Okata Community Center
Senzu Community Center
Senzu Community
Center Gymnasium

Kitanoyama
Community Center
Oshima High School
Daiichi Junior HighSchoolGymnasium
Oshima Town
OfficeMotomachi Port

Nomashi Community
Center Gymnasium

New Crater
Lookout●
Mt.Mihara Summit
Entrance

Mt.Kushigata
Lookout No.2●

Nomashi Evacuation
Center●●Crater Observation
Nomashi Community
CenterVolcanic Alert Levels

Tsubaki Elementary
School Gymnasium

600m
1㎞

Level 1
Level 2
Level 3-①2㎞

The Izu-Oshima Volcano is an active volcano that erupts
frequently. Although this volcano is currently calm,
experts believe that magma accumulation is increasing
the likelihood of a future eruption. In addition toproviding information you can use to protect yourself,
this map lists actions that should be taken immediately
when the risk of eruption is elevated. Understanding
specific hazards from past volcanic eruptions will help
you take the appropriate actions in the event evacuationis required. However, unlike the weather, it can bedifficult to predict eruptions because so much remains
unknown about volcanos.
There is a possibility that the volcano can erupt without
a moments notice. The Izu-Oshima Volcano may beparticularly susceptible to fissure eruptions and lateralblasts near residential areas, the coast, and places otherthan the crater at the summit. There is also a risk thatthe volcano could erupt shortly after the occurrence ofsudden crustal movement or frequent earthquakes. It istherefore important to note that this map alone does notprovide sufficient information on the dangers of a
volcanic eruption or the best evacuation strategies.
Please remember, however, that volcanos typically have
far longer periods of calm than activity and can be safely
enjoyed while dormant.

Level 3-②

Habuminato
Community
CenterGymnasium

Level 3 Do not approach the volcano② Restricted entry zone inside the caldera and a 1 km
radius outside from the edge of the caldera (area markedby the orange line labeled "Level3-②" on the map ).
① Restricted entry zone inside the caldera and a 2 km
radius from the summit crater (area marked by the orange
line labeled "Level3-①" on the map).
Level 2 Do not approach the crater
Restricted entry zone of 1 km radius from the summitcrater.
Level 1 Potential for increased activity
Restricted entry zone of 600m, however, the nature trail
and vicinity of the observatory are excluded in normal
periods.

KEY
Evacuation site and Evacuation center

Mabushi Cultural Center

Habuminato
Community
CenterMabushi Evacuation Center
Sashikiji Community
Center Gymnasium
Sashikiji Community Center

Evacuation centerHistoric lava flow

Evacuation port

Caldera wall

Pyroclastic cone

Forecasted lava flow basin

Crater or vent

Restricted point
Orange: Volcanic Alert Level 3
Yellow : Volcanic Alert Level 2
White : Volcanic Alert Level 1

Habu Port

Oshima Kaiyo Kokusai High School
Kudatchi Elderly Welfare Hall

Shelter

Tsutsuji Elementary School
Daisan Junior High School Gymnasium

Approval by the Director-General of the Geospatial Information Authority of Japan based on the Survey Act (use) R2Hs 863「測量法に基づく国土地理院長承認（使用）R 2JHs 863」

Areas where eruptions are likely to occur

Areas where volcanic ash and scoria are likely to fall
Areas where phreatomagmatic eruption are likely to occur
Areas likely to be influenced by volcanic gas

KEY

KEY

Areas where craters arehighly likely to occur.
Areas where craters area little more likely to occur.
Areas where craters area little less likely to occur.
Areas where craters
are unlikely to occur.
Pre-caldera
CraterFissure or Dike
Syn- and post-caldera
CraterFissure or Dike

Volcanic ashfall and scoria emitted
Areas where it is highly likely to fall.
Areas where it is a little less likely to fall.
※ Inside of the range.
Phreatomagmatic eruption
Areas where it is likely togenerate.
Areas where it is a little
more likely to generate.
Influence of Volcanic gas
Areas where it is likely
to influence.
Areas where it is a little
more likely to influence.

List of Disaster Prevention Organizations and Associations
Name

Location

Phone

Oshima Town
Motomachi 2-1441
OfficeName
Tokyo
Metropolitan
Oshima Island
Branch Office
OshimaPolice Station
Oshima Town Fire
Headquaters
OshimaMedical Center
Oshima Tourism
Association

Kitanoyama
Motomachi 2-3525
Branch Office
Okata
Okata2-8121
Branch OfficeSenzu BranchSenzu
2-8523
OfficeNomashi
Nomashi2-2378Branch Office
Sashikiji
Sashikiji
4-0441 Tokaikisen
Branch Office
Habu Branch
New Central
Habuminato 4-0444
OfficeAirservice

Location

Phone

Motomachi 2-4411
Motomachi 2-0110
Motomachi 2-0119
Motomachi 2-2345
Motomachi 2-2177
Motomachi 2-2311
Motomachi 2-1651

NOTE
Predetermined evacuation destination:

Emergency contact:
Source: Kawanabe (1998)
Izu Oshima Evacuation Planon Volcanic Activity (2020)

There are approximately 80 craters on the island which show theVolcanic ash, scoria (black pumice stone), and volcanic gas spouted from theoccurrence of both fissure eruptions and lateral eruptions, which aresummit crater are swept away by the predominant northeastern, southwestern,
distributed in a belt from the north-northwest to the south-southeast,
and western winds on Izu Oshima, and tend to descend in the direction ofwith Cape Chigasaki to the north, and Habu Port to the south. It has been Senba and the Uminofurusato-mura. A phreatomagmatic eruption is a violent
determined that there is a high possibility of eruptions occurring in theoccurrence that happens when magma and water come into contact with eachareas of the central, southern and eastern parts of the island and inother. It is considered that this is likely to occur near the southern coast aroundparticular, on the summit.
Habu Port and at low altitudes in the north.

For inquiries about this Disaster
Prevention Map :Oshima Town Office - Disaster Prevention Division
04992-2-0035