Izu Peninsula
Philippine Sea Plate
200cm 130cm
Geography created by Tanna Fault and trace of North Izu
earthquake
http://www.town.kannami.shizuoka.jp/ http://izugeopark.org/
There is a long linear valley in the north and south of Tanna
Basin, and along the valley, basins including Tashiro Basin, Tanna
Basin and Ukihashi Basin continue. Such valley and basins were
created by the activities of Tanna Fault (North Izu Fault Zone)
which repeated many times in the past.
Kannami Area : Tanna Basin GeositeTanna Fault Park
LatitudeLongitude
350547.5N1390103.6E
Hata, Kannami-town
A-AB-B
1km
Tanna Fault is a left lateral fault whose opposite side
moves
to the left.
The rivers of A-A and B-B in the figure on the left were
origi-
nally one river, but were separated by 1 km to the north and
south by the Tanna Fault.
1km
19301126
7.3
2m
8000
970010001
Latest activity of Tanna Fault is North Izu earthquake on
No-vember 26, 1930 (magnitude 7.3). In this earthquake, some places
had a strike slip over 2m.After this earthquake, an study of the
fault was conducted to find that there had been 9 earthquakes in
the past 8,000 years and a great earthquake occurred in each
700-1,000 years
A long valley created by the fault
The river separated by 1km
North Izu earthquake
IZ
U P
ENIN
SU
LA G
EOP
AR
K
Legend
Geopoint
/ View point
Park
Railway station
Hot spring
Historical monument
/ Museum
010km 5km
0
5km
5km
10km
Tanna Fault
136
136
11141
20
141
21
1
140
80
19
129
132
414
Mishima City
Mishima Sta.
Mishima City
Izunokuni CityIzunokuni City
Kannami Town
Daiba Sta.
Nirayama Sta.
Izu-Nagaoka Sta.
Ohito Sta.
Kannami Sta.
Mt.Katsuragiyama
Mt.Joyama
Hatake Spa.
Kona Spa.
Nagaoka Spa.
Mishima Taisha Shrine
Tokaido Shinkansen
Tokaido Main Line
Kashiya Ancient Graves
GekkouAstronomicalObservatory
Karaijinja Shrine
Tanna Fault Park
Mt.Kurotake
Ukihashi Basin
Sukumoyamavolcano
KannamiBuddha statuesMuseum
Jukkokutouge Pass
Kannami Town Office
Nirayama Reverberatory furnace
Izuhakone Railway
Taga t a P l a i n
Stria of Earthquake
Kanogawa River
Izu-Chuo Road
0m
500m
1000m Elevation
You are here
Yamanaka Castle
Primeval forest park
I z u S k y l i n e
Tanna Basin
Tashiro Basin
Izunitta Sta.
Raikogawa River
Tokaido Shinkansen Tokaido Mail Line
0 2000m2000m
020
00m
2000
m40
00m
6000
m
:
Ta
nn
a F
au
l t
A
A
B
B
Mt. Kurotake
Karaijinja shrine
Nishi Tanna Parking
You are here
Tanna Fault Park
Kingdom of Oratche
JukkokutogePass
Korigaike Pond
Tanna Basin
Tashiro Basin
160m
2m
16
North Izu earthquake also attacked the construction site of
Tanna Tunnel which had been dug at approximately 160m underground
of Tanna Basin. As there was large amount of spring water when the
construction site approached around the fault, a sub-tunnel had
been dug to release the water at the time of the earthquake. The
fault ran under this sub-tunnel and a slip over 2m occurred.The
tunnel was opened after 16 years of difficult construction, but
Tanna area fell victim to drought by this construction. Although
rice cultivation and horse radish cultivation using abundant water
had been conducted besides the dairy industry, with the
compensation from the former Ministry of Railways for the drought,
they shifted to the dairy industry.
The fault slip created by North Izu earthquake is preserved here
at Tanna Fault Park and Karaijinja Shrine in Tashiro Basin. Tanna
Fault Park is designated as the national natural monument to show
the memory of the earthquake in the present time.
Memory of the earthquake
Difficulty in Tanna Tunnel construction and dairy industry in
Tanna Basin
Tanna fault
The water channel which was linear before the earth-quake is now
a left strike slip by the fault. There is an underground
observation room on the extended line of the fault shown by the
dashed line.
English English English English English
Tanna
fault
Tashiro Basin
Tanna Basin
A slip in the water channel created by North Izu earthquake
(in Tanna Fault Park)
20001000 1000200 200100 10060 60 6020
0.2 million years agoRecent2010 million years ago 102 million
years ago 21 million years ago 10.6 million years ago 0.6 million
years ago 0.60.2 million years ago
Deep Submarine Volcanism
Shallow Submarine Volcanism The collision start
Progress of the collision
The Izu Peninsula is almost completed
An active monogenetic volcano field and crustal movements
800400km
40080km
8040km
Submarine Volcanoes Terrestrial VolcanoesCollision to Main
Island (Honsyu)
Honsyu Honsyu Honsyu
Trench Trench
Submarine Volcanoes Submarine VolcanoesSmall Volcanic Island
Uplit and Erosion of Tanzawa mountains
Uplift of Izu Massif
Tanna Fault
Irozaki Fault Izu Tobu Volcano GroupAmagi Volcano
Hakone Volcano
Suruga Bay
Taga Volcano
Usami VolcanoNanzaki VolcanoJyaishi Volcano
Daruma Volcano
20
Establishment of the Peninsula
Geological History of Izu Peninsula
