FAQ







Zao

Google Earth Placemark
  • Country
  • Subregion Name
  • Volcano Type
  • Last Known Eruption
  • 1841 m
  • 38.141°
  • 140.443°
  • Elevation
  • Latitude
  • Longitude

No latest activity reported for #volcano.name#.



 Available Weekly Reports


There are no weekly reports found.

Below is a summary of eruption dates and Volcanic Explosivity Indices (VEI).


Start Date (mm/dd/yyyy)
Stop Date (mm/dd/yyyy)
VEI
5/18/1940
5/18/1940
1
7/0/1939
0/0/
1
0/0/1927
0/0/
1
0/0/1906
0/0/
0/0/1905
0/0/
1
1/14/1897
1/14/1897
1
3/8/1896
3/8/1896
1
9/1/1896
0/0/
1
2/15/1895
3/22/1895
1
8/22/1895
9/28/1895
2
7/3/1894
7/3/1894
2
0/0/1890
0/0/
1
8/0/1873
9/0/1873
1
10/21/1867
0/0/
2
0/0/1833
0/0/
2
11/22/1831
0/0/
2
0/0/1830
0/0/
2
5/1/1822
0/0/
1/27/1821
5/1/1821
2
6/12/1809
12/29/1809
2
7/12/1806
0/0/
2
5/0/1804
0/0/
2
3/24/1796
0/0/
2
9/22/1794
12/0/1794
2
5/29/1694
8/30/1694
2
4/26/1670
9/26/1670
2
0/0/1669
0/0/
3
8/0/1668
0/0/
2
0/0/1641
0/0/
2
0/0/1630
0/0/
2
5/15/1623
11/15/1624
3
0/0/1622
0/0/
2
0/0/1620
0/0/
2
0/0/1400
0/0/
3
0/0/1350
0/0/
2
0/0/1331
0/0/1333
2
11/29/1230
0/0/
2
10/0/1227
0/0/
3
5/28/1183
0/0/
2
0/0/884
0/0/
3
11/0/773
0/0/
0/0/300
0/0/
4
0/0/-1600
0/0/
0/0/-2000
0/0/
0/0/-2300
0/0/
0/0/-2600
0/0/
0/0/-3350
0/0/
0/0/-3850
0/0/
0/0/-4150
0/0/
0/0/-5500
0/0/
0/0/-5600
0/0/
0/0/-7600
0/0/

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Hasenaka T, Ui T, Nakamura Y, Hayashi S, 1992. Traverse of Quaternary volcanoes in Japan. {29th Internatl Geol Cong, Kyoto, Field Trip A06}, 74 p

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. {IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior}.

Ichimura T, 1951. Geological investigations on the Zao volcanoes. 1. Goshikidake, a central cone of the Zao proper. {Bull Earthq Res Inst, Univ Tokyo}, 39: 327-339

Ishikawa H, Ohba T, Fujimaki H, 2007. Sr isotope diversity of hot spring and volcanic lake waters from Zao volcano, Japan. {J Volc Geotherm Res}, 166: 7-16

Japan Meteorological Agency, 1996. {National Catalogue of the Active Volcanoes in Japan (second edition)}. Tokyo: Japan Meteorological Agency, 502 p (in Japanese)

Kudo T, Hoshizumi H, 2006-. Catalog of eruptive events within the last 10,000 years in Japan, database of Japanese active volcanoes. Geol Surv Japan, AIST, http://riodb02.ibase.aist.go.jp/db099/eruption/index.html

Kuno H, 1962. Japan, Taiwan and Marianas. {Catalog of Active Volcanoes of the World and Solfatara Fields}, Rome: IAVCEI, 11: 1-332

Miura K, Ban M, Yagi H, 2008. The tephra layers distributed around the eastern foot of the Zao volcano--ages and volumes of the Za-To 1 to 4 tephras. {Bull Volc Soc Japan (Kazan)}, 53: 151-157

Nakano S, Yamamoto T, Iwaya T, Itoh J, Takada A, 2001-. {Quaternary Volcanoes of Japan}. Geol Surv Japan, AIST, http://www.aist.go.jp/RIODB/strata/VOL_JP/



The Zao volcano group, the most active of northern Honshu, consists of a complex cluster of stratovolcanoes straddling the Pacific Ocean-Japan Sea divide. The Pleistocene Ryuzan volcano forms the western Zao group (Nishi-Zao), and Byobu and Fubo volcanoes form the southern Zao group (Minami-Zao). The complex was constructed over granitic basement rocks as high as 1500 m and thus has a relatively small volume. The 7 cu km Zao volcano proper forms the central ao group (Chuo-Zao), a volcanic complex topped by several lava domes and the Goshiki-dake tuff cone, aligned along a NW-SE trend. Several episodes of edifice collapse produced debris avalanches during the Pleistocene. Goshiki-dake contains the active Okama crater, filled with a colorful, strongly acidic crater lake (pH 1.3). It has been the source of most of the frequent historical eruptions of Zao volcano, which date back to the 8th century AD.