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Zao volcan

Updated: 3 mars. 2024 15:30 GMT -
comlex volcano 1841 m / 6,040 ft
Honshu (Japon), 38.14°N / 140.44°E
Condition actuelle: normal / en sommeil (1 sur 5)
Last update: 21 déc. 2021 (Smithsonian / USGS Weekly Volcanic Activity Report)

Zao (or Zaozan, Zaosan) volcano is the most active volcano of northern Honshu and consists of a group of stratovolcanoes forming the crest of the divide between the Pacific Ocean and the Japan Sea.
The older parts of the complex are Ryuzan volcano in the west and Byobu and Fubo volcanoes forming the southern group. Zao volcano proper (Chuo-Zao) is the youngest edifice and forms the central part of the group. One of its youngest summit lava domes is Goshiki-dake, which contains the active Okama crater, the source of most of the frequent historical eruptions recorded since the 8th century AD.
Okama crater contains a colorful, strongly acidic crater lake (pH 1.3).

Montrer carte interactive
Style éruptif tipique: explosive (phreatic)
Eruptions du volcan Zao: 1940, 1939 (?), 1927 (?), 1905, 1897 (?), 1896, 1895, 1895, 1894, 1890 (?), 1873, 1867, 1833, 1831, 1830, 1822, 1821, 1809, 1806, 1804, 1796, 1794, 1694, 1670, 1669, 1668, 1641, 1630, 1623-24, 1622, 1620, 1400 ± 100 years (radiocarbon), 1350 (?), 1331-33 (?), 1230, 1227, 1183, 884, 773 (?), 300 AD ± 200 (RC), 1600 BC (?, RC), 2000 BC ± 500 (tephrochronology), 2300 BC ± 75 (RC), 2600 BC ± 200 (RC), 3350 BC ± 50 (RC), 3850 BC ± 200 (RC), 4150 BC ± 200 (RC), 5500 BC (?, RC), 5600 BC (?, RC), 7600 BC (?, RC)

Derniers séismes proches

HeureMag. / ProfondeurDistance/Lieu
2 mars 03:56 (GMT +9)
1 mars. 18:56 GMT
2.7

18 km
26 km au sud-ouest 26 km au nord-ouest de Fukushima, Préfecture de Fukushima, Japon Info
mercredi, 28 février 2024 GMT (2 séismes)
29 févr. 00:56 (GMT +9)
28 févr.. 15:56 GMT
3.0

208 km
14 km à l'ouest 8.8 km au sud-ouest de Yamagata, Préfecture de Yamagata, Japon
I FELT IT
Info
28 févr. 19:29 (GMT +9)
28 févr.. 10:29 GMT
2.8

139 km
18 km au nord-est 26 km à l'ouest de Sendai, Préfecture de Miyagi, Japon Info
mercredi, 21 février 2024 GMT (1 séisme)
22 févr. 07:54 (GMT +9)
21 févr.. 22:54 GMT
3.1

211 km
25 km au nord-ouest 13 km au nord-ouest de Yamagata, Préfecture de Yamagata, Japon Info

Introduction

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.

1992 earthquake
A M 4.7 earthquake occurred at 17h58 local time on 1 September a few kilometers ESE of the summit. There were no visible changes.

1990 seismic swarm
In July 1990, many small earthquakes were detected below the summit of Zao volcano.
(GVP)

1867 phreatic eruption and fatalities
On 21 Oct 1867, a phreatic eruption caused an overflow of muddy water from Okama crater lake, which killed 3 bathers who were in the hot springs at the foot of Goshiki-dake. ...more

See also: Sentinel hub | Landsat 8 | NASA FIRMS
Actualités
mer., 24 janv. 2018, 06:00

Zaozan [Zaosan] volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 24 January-30 January 2018 (New Activity / Unrest)

JMA reported that tremor was detected at Zaozan on 28 and 30 January, and minor inflation at the S part of the volcano was recorded. There were 12 volcanic earthquakes detected on 31 January. JMA raised the Alert level to 2 (on a 5-level scale), noting the increased potential for a small eruption. ... Read all
lun., 30 nov. 2015, 07:57

Zao volcano (Miyagi Prefecture, Japan): signs of internal unrest

Signs of unrest have been reported from the volcano. According to a news article, new episodes of volcanic tremor were detected under the volcano recently, believed to be signs of increased internal fluid movements. Read all
Actualités
mer., 24 janv. 2018, 06:00

Zaozan [Zaosan] volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 24 January-30 January 2018 (New Activity / Unrest)

JMA reported that tremor was detected at Zaozan on 28 and 30 January, and minor inflation at the S part of the volcano was recorded. There were 12 volcanic earthquakes detected on 31 January. JMA raised the Alert level to 2 (on a 5-level scale), noting the increased potential for a small eruption. ... Read all
lun., 30 nov. 2015, 07:57

Zao volcano (Miyagi Prefecture, Japan): signs of internal unrest

Signs of unrest have been reported from the volcano. According to a news article, new episodes of volcanic tremor were detected under the volcano recently, believed to be signs of increased internal fluid movements. Read all
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