Global Volcanism Program

Chokaisan

Google Earth Placemark with Features

Cite Volcano Profile

Japan
Northeast Japan Volcanic Arc
Composite | Stratovolcano(es)
1974 CE

Country
Volcanic Region
Landform | Volc Type
Last Known Eruption

39.099°N
140.049°E
2,236 m
7,336 ft
283220

Latitude
Longitude
Summit
Elevation
Volcano
Number

Most Recent Bulletin Report: April 1974 (CSLP 50-74)

Explosions cause ashfall in March and April

Card 1835 (01 April 1974) Large ash eruptions on 1 March from the E side of the central cone

After a long period of inactivity (since 1821), Tyokai volcano blew up on 1 March. Explosions at 1010 and 1130 (0110 and 0230 GMT) were the biggest, and repeated about ten times. Black smoke rose, and the volcanic ash fall lasted for ten minutes. According to aerial observations that same day, the eruption site was confirmed to be located on the eastern side of Sinzan, a central cone of this volcano. At first black smoke was spewing from the crater, and black ash was deposited on the eastern slope of the snow-covered volcano. According to an aerial observation on 3 March, this black smoke had turned into white vapor. Temporary seismic observations were carried out by the Tohoku University and the JMA around the skirt of this volcano, and scores of volcanic earthquakes were detected. A black belt (about 1.5 km long and 20-30 m wide) composed of ash-deposits and snow flowed down to the north side on 6 March. This belt is considered to be the result of a snow slide and there was no change or re-activity in the volcanic state. Gray volcanic smoke was observed on 5 March from the slope of the volcano, but there was no smoke after that.

Card 1850 (30 April 1974) Intermittent variable actiivty; ashfall on 24 April

The activity of Tyokai volcano started with the black smoke eruption and the volcanic ash fall on 1 March, but showed decreasing activity thereafter. Recently, however, the activity increased, and the following phenomena took place:

1) According to a visual observation on 8 April, and an aerial observation on 15 April, white smoke several tens of meters in height erupted from the new crater on the eastern flank of Sinzan, a central cone of this volcano, and white vapor about 20 m in height erupted from the 500 m long fissure on the western flank of Sinzan. On the fissure about ten fumaroles have formed.

2) On 24 April, black smoke, about several hundred meters in height, rose from the fissure on the W flank of Sinzan, and ash fell on the E foot of Tyokai volcano. On that day this black smoke gradually turned into white vapor. Simultaneously, a mud flow started from the summit crater and flowed down the W side, and this belt reached 3 km in length.

Information Contacts:
Card 1835 (01 April 1974) T. Tiba, Dept. of Geology, National Science Museum, Tokyu, Japan.
Card 1850 (30 April 1974) Seismological Division, JMA.

The Global Volcanism Program has no Weekly Reports available for Chokaisan.

Bulletin Reports - Index

Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

04/1974 (CSLP 50-74) Explosions cause ashfall in March and April

Information is preliminary and subject to change. All times are local (unless otherwise noted)

April 1974 (CSLP 50-74)

Explosions cause ashfall in March and April

Card 1835 (01 April 1974) Large ash eruptions on 1 March from the E side of the central cone

Card 1850 (30 April 1974) Intermittent variable actiivty; ashfall on 24 April

Information Contacts:
Card 1835 (01 April 1974) T. Tiba, Dept. of Geology, National Science Museum, Tokyu, Japan.
Card 1850 (30 April 1974) Seismological Division, JMA.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Synonyms

Cones

Feature Name

Feature Type

Elevation

Latitude

Longitude

Higashi-Chokai

Stratovolcano

2230 m

Kannon-mori

Cone

685 m

Nishi-Chokai

Stratovolcano

Craters

Feature Name

Feature Type

Elevation

Latitude

Longitude

Saruana

Crater

Tamano-ike

Crater

Torinoumi

Crater

1600 m

Domes

Feature Name

Feature Type

Elevation

Latitude

Longitude

Kojin-yama
Kozin-yama

Dome

Kyowa-yama

Dome

Nabemori

Dome

Sensumori

Dome

Shin-zan
Sin-zan

Dome

2233 m

39° 5' 47" N

140° 3' 8" E

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude

283220

1974 CE

2,236 m / 7,336 ft

39.099°N
140.049°E

Morphology

Volcano Landform
Composite

Volcano Types
Stratovolcano(es)
Caldera
Lava dome(s)

Rock Types

Major
Andesite / Basaltic Andesite
Basalt / Picro-Basalt

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km

131
707
185,681
2,301,576

Geological Summary

Massive Chokaisan volcano is composed of two overlapping stratovolcanoes with a conical profile that inspired the local names of Akita-Fuji or Dewa-Fuji. The summit of the gently sloping western edifice (Nishi-Chokaisan) is cut by a large scarp open to the south that contains lava domes. The younger eastern volcano (Higashi-Chokaisan) began forming about 20,000 years ago, and also has a large scarp, breached to the north. During an eruption about 2,600 years ago it was the source of the voluminous Kisakata debris avalanche, which reached the Pacific coast. Two post-caldera lava domes have been constructed at the upper SE end of the caldera. Intermittent reports of eruptions date back to the 6th century CE.

References

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Ban M, Hayashi S, Takaoka N, 2001. K-Ar dating of the Chokai volcano, northeast Japan arc--a compound volcano composed of continuously established three stratovolcanoes. Bull Volc Soc Japan (Kazan), 46: 317-333 (in Japanese with English abs).

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.

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

Japan Meteorological Agency, 2013. National Catalogue of the Active Volcanoes in Japan (fourth edition, English version). Japan Meteorological Agency.

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, https://gbank.gsj.jp/volcano/index_e.htm.

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

Murayama I, 1987. Volcanoes of Japan (I). Tokyo: Daimedo, 315 p (2nd edition, in Japanese).

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/.

Eruptive History

There is data available for 14 confirmed Holocene eruptive periods.

1974 Mar 1 - 1974 Apr 30 Confirmed Eruption VEI: 1

Episode 1 | Eruption

E side of Shinzan, W of Kojin-yama

1974 Mar 1 - 1974 Apr 30

Evidence from Observations: Reported

List of 6 Events for Episode 1 at E side of Shinzan, W of Kojin-yama

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Seismicity (volcanic)
- - - -	- - - -	Phreatic activity	moderate
- - - -	- - - -	Ash
- - - -	- - - -	Earthquakes (undefined)	Before.
- - - -	- - - -	Lahar or Mudflow	moderate
1974 Mar 1	- - - -	VEI (Explosivity Index)

1834 Jul 9 - 1834 Jul Confirmed Eruption VEI: 2 (?)

Episode 1 | Eruption

1834 Jul 9 - 1834 Jul

Evidence from Observations: Reported

List of 4 Events for Episode 1

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Phreatic activity
- - - -	- - - -	Lahar or Mudflow	Uncertain
- - - -	- - - -	Fauna Kill	Aquatic.
1834 Jul 9	- - - -	VEI (Explosivity Index)

1821 May 23 Confirmed Eruption VEI: 2 (?)

Episode 1 | Eruption

Near Shinzan and Shichiko-zan

1821 May 23 - Unknown

Evidence from Observations: Reported

List of 2 Events for Episode 1 at Near Shinzan and Shichiko-zan

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Phreatic activity
	1821 May 23	- - - -	VEI (Explosivity Index)

1800 Dec - 1804 Jul (?) Confirmed Eruption VEI: 2

Episode 1 | Eruption

Shinzan (foot of Kojin-yama)

1800 Dec - 1804 Jul (?)

Evidence from Observations: Reported

List of 13 Events for Episode 1 at Shinzan (foot of Kojin-yama)

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Explosion
- - - -	- - - -	Phreatic activity
- - - -	- - - -	Lava flow
- - - -	- - - -	Lava dome
- - - -	- - - -	Ash
- - - -	- - - -	Bombs
- - - -	- - - -	Blocks
- - - -	- - - -	Earthquakes (undefined)	Time and Type Unknown.
- - - -	- - - -	Lahar or Mudflow
- - - -	- - - -	Fauna Kill	Aquatic.
1800 Dec	- - - -	VEI (Explosivity Index)
1801 Aug 10	- - - -	VEI (Explosivity Index)
1801 Aug 14	- - - -	Fatalities

[ 1764 ] Uncertain Eruption

Episode 1 | Eruption

1764 - Unknown

Evidence from Unknown

List of 4 Events for Episode 1

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Explosion	Uncertain
- - - -	- - - -	Cinder Cone	Uncertain
- - - -	- - - -	Scoria	Uncertain
1764	- - - -	VEI (Explosivity Index)

1740 Jun (?) - 1747 (?) Confirmed Eruption VEI: 2 (?)

Episode 1 | Eruption

Small crater at foot of Kojin-yama

1740 Jun (?) - 1747 (?)

Evidence from Observations: Reported

List of 4 Events for Episode 1 at Small crater at foot of Kojin-yama

Start Date	End Date	Event Type
- - - -	- - - -	Phreatic activity
- - - -	- - - -	Ash
- - - -	- - - -	Property Damage
1740 Jun (?)	- - - -	VEI (Explosivity Index)

[ 1738 Dec 31 ± 365 days ] Uncertain Eruption

Episode 1 | Eruption

1738 Dec 31 ± 365 days - Unknown

Evidence from Unknown

List of 2 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Explosion
	1738 Dec 31 ± 365 days	- - - -	VEI (Explosivity Index)

[ 1735 ] Uncertain Eruption

Episode 1 | Eruption

1735 - Unknown

Evidence from Unknown

List of 4 Events for Episode 1

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Explosion	Uncertain
- - - -	- - - -	Cinder Cone	Uncertain
- - - -	- - - -	Scoria	Uncertain
1735	- - - -	VEI (Explosivity Index)

1659 Apr - 1663 ± 1 years Confirmed Eruption

Episode 1 | Eruption

1659 Apr - 1663 ± 1 years

Evidence from Observations: Reported

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Phreatic activity

[ 1560 ] Uncertain Eruption

Episode 1 | Eruption

1560 - Unknown

Evidence from Unknown

List of 2 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Explosion	Uncertain
	- - - -	- - - -	Volcanic "smoke"

[ 1477 ] Uncertain Eruption

Episode 1 | Eruption

1477 - Unknown

Evidence from Unknown

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Ash	Uncertain

[ 0999 ] Uncertain Eruption

Episode 1 \| Eruption
0999 - Unknown				Evidence from Unknown

[ 0948 Dec 31 ± 365 days ] Uncertain Eruption

Episode 1 \| Eruption
0948 Dec 31 ± 365 days - Unknown				Evidence from Unknown

0939 May 15 Confirmed Eruption

Episode 1 | Eruption

0939 May 15 - Unknown

Evidence from Observations: Reported

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Phreatic activity

[ 0915 Aug 23 - 0915 Sep 1 ] Discredited Eruption

[ 0884 Jul 26 - 0884 Aug ] Uncertain Eruption

Episode 1 | Eruption

0884 Jul 26 - 0884 Aug

Evidence from Unknown

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Explosion	Uncertain

0871 May 5 Confirmed Eruption VEI: 2

Episode 1 | Eruption

0871 May 5 - Unknown

Evidence from Observations: Reported

List of 5 Events for Episode 1

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Explosion	violent, strong, or large
- - - -	- - - -	Lava flow
- - - -	- - - -	Lahar or Mudflow
- - - -	- - - -	Fauna Kill	Aquatic.
0871 May 5	- - - -	VEI (Explosivity Index)

[ 0861 May ] Uncertain Eruption

Episode 1 | Eruption

0861 May - Unknown

Evidence from Unknown

List of 3 Events for Episode 1

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Explosion	Uncertain
- - - -	- - - -	Cinder Cone	Uncertain
0861 May	- - - -	VEI (Explosivity Index)

[ 0857 May ] Uncertain Eruption

Episode 1 | Eruption

0857 May - Unknown

Evidence from Unknown

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Earthquakes (undefined)

[ 0856 ] Uncertain Eruption

Episode 1 \| Eruption
0856 - Unknown				Evidence from Unknown

[ 0839 Oct 14 ] Uncertain Eruption

Episode 1 | Eruption

0839 Oct 14 - Unknown

Evidence from Unknown

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Explosion	Uncertain

0830 Jan Confirmed Eruption

Episode 1 | Eruption

0830 Jan - Unknown

Evidence from Observations: Reported

List of 4 Events for Episode 1

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Phreatic activity
- - - -	- - - -	Ash
- - - -	- - - -	Lahar or Mudflow
- - - -	- - - -	Fauna Kill	Aquatic.

0817 ± 7 years Confirmed Eruption

Episode 1 | Eruption

0817 ± 7 years - Unknown

Evidence from Observations: Reported

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Phreatic activity

[ 0804 - 0806 ] Uncertain Eruption

Episode 1 | Eruption

0804 - 0806

Evidence from Unknown

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Explosion	Uncertain

[ 0717 Jul ] Uncertain Eruption

Episode 1 | Eruption

0717 Jul - Unknown

Evidence from Unknown

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Explosion

0711 ± 3 years Confirmed Eruption

Episode 1 | Eruption

0711 ± 3 years - Unknown

Evidence from Observations: Reported

List of 3 Events for Episode 1

Start Date	End Date	Event Type
- - - -	- - - -	Phreatic activity
- - - -	- - - -	Cinder Cone
- - - -	- - - -	Evacuations

[ 0610 ± 18 years ] Uncertain Eruption

Episode 1 | Eruption

0610 ± 18 years - Unknown

Evidence from Unknown

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Explosion	Uncertain

[ 0577 Dec 1 ± 30 days - 0578 Jul 15 ± 45 days ] Uncertain Eruption

Episode 1 | Eruption

0577 Dec 1 ± 30 days - 0578 Jul 15 ± 45 days

Evidence from Unknown

List of 3 Events for Episode 1

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Explosion	Uncertain
- - - -	- - - -	Lava flow	Uncertain
- - - -	- - - -	Cinder Cone	Uncertain

[ 0573 Mar (?) ] Uncertain Eruption

Episode 1 | Eruption

0573 Mar (?) - Unknown

Evidence from Unknown

List of 5 Events for Episode 1

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Explosion	Uncertain
- - - -	- - - -	Cinder Cone	Uncertain
- - - -	- - - -	Scoria	Uncertain
- - - -	- - - -	Audible Sounds	Uncertain
- - - -	- - - -	Earthquakes (undefined)	Uncertain

0450 BCE (?) Confirmed Eruption

Episode 1 | Eruption

OD-12 tephra

0450 BCE (?) - Unknown

Evidence from Correlation: Tephrochronology

List of 2 Events for Episode 1 at OD-12 tephra

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Phreatic activity
	- - - -	- - - -	Tephra

0650 BCE (?) Confirmed Eruption

Episode 1 | Eruption

Higashi-Chokai

0650 BCE (?) - Unknown

Evidence from Isotopic: 14C (uncalibrated)

List of 5 Events for Episode 1 at Higashi-Chokai

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Phreatic activity	Uncertain
- - - -	- - - -	Lava flow	Uncertain
- - - -	- - - -	Lava dome	Uncertain
- - - -	- - - -	Avalanche
- - - -	- - - -	Edifice Destroyed	Collapse/avalanche

1050 BCE (?) Confirmed Eruption VEI: 0

Episode 1 | Eruption

West flank (Saruana crater)

1050 BCE (?) - Unknown

Evidence from Correlation: Tephrochronology

List of 3 Events for Episode 1 at West flank (Saruana crater)

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Lava flow
- - - -	- - - -	Lava flow	Entered water.
1050 BCE (?)	- - - -	VEI (Explosivity Index)

Deformation History

There is no Deformation History data available for Chokaisan.

Emission History

There is no Emissions History data available for Chokaisan.

Photo Gallery

Chokaisan is the largest of the NE Honshu volcanoes, seen here from the NE. The volcano is comprised of two main overlapping edifices, the younger eastern area contains the large collapse scarp that was the source of the Kisakata debris avalanche, seen here opening to the N. Smaller cones later filled much of the area near the rear scarp.

Photo courtesy Ichio Moriya (Kanazawa University).

The N flank of Chokaisan was the source of a large debris avalanche about 2,600 years ago that traveled 25 km into the Japan Sea and underlies much of the foreground area. Collapse of the summit left a 3 x 4 km open scar with the eastern rim forming the left-center peak, and the western rim to the right. Following the collapse, a series of lava domes and lava flows filled the upper area and formed the center peak.

Photo by Ichio Moriya (Kanazawa University).

An ash plume rises from the Shinzan lava dome at the summit of Chokaisan on 1 March 1974 after a repose of 140 years. Phreatic eruptions occurred in March and April that produced small lahars. The eruptions took place from an E-W-trending series of vents extending from the eastern caldera wall across the 1801 Shinzan lava dome and the Kojinyama cone. This view from the NW shows the eastern caldera wall behind the dome.

Photo courtesy of Japan Meteorological Agency, 1974.

A plume rises from a vent on Chokaisan on 24 April 1974 near the end of an eruption that began on 1 March. Ash deposits cover the slopes of the summit and lahar deposits descend the flanks to the lower left in this view from the SW. Shinzan lava dome appears above the plume to the left, with the eastern caldera wall in the background. The 1974 eruption, the first from Chokaisan in 140 years, ended on 30 April.

Photo courtesy of Japan Meteorological Agency, 1974.

GVP Map Holdings

Maps are not currently available due to technical issues.

Smithsonian Sample Collections Database

There are no samples for Chokaisan in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

External Sites

Copernicus Browser

The Copernicus Browser replaced the Sentinel Hub Playground browser in 2023, to provide access to Earth observation archives from the Copernicus Data Space Ecosystem, the main distribution platform for data from the EU Copernicus missions.

MIROVA

Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.

MODVOLC Thermal Alerts

Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.

WOVOdat
   Single Volcano View
   Temporal Evolution of Unrest
   Side by Side Volcanoes

WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.

GVMID Data on Volcano Monitoring Infrastructure The Global Volcano Monitoring Infrastructure Database GVMID, is aimed at documenting and improving capabilities of volcano monitoring from the ground and space. GVMID should provide a snapshot and baseline view of the techniques and instrumentation that are in place at various volcanoes, which can be use by volcano observatories as reference to setup new monitoring system or improving networks at a specific volcano. These data will allow identification of what monitoring gaps exist, which can be then targeted by remote sensing infrastructure and future instrument deployments.

Volcanic Hazard Maps

The IAVCEI Commission on Volcanic Hazards and Risk has a Volcanic Hazard Maps database designed to serve as a resource for hazard mappers (or other interested parties) to explore how common issues in hazard map development have been addressed at different volcanoes, in different countries, for different hazards, and for different intended audiences. In addition to the comprehensive, searchable Volcanic Hazard Maps Database, this website contains information about diversity of volcanic hazard maps, illustrated using examples from the database. This site is for educational purposes related to volcanic hazard maps. Hazard maps found on this website should not be used for emergency purposes. For the most recent, official hazard map for a particular volcano, please seek out the proper institutional authorities on the matter.

IRIS seismic stations/networks

Incorporated Research Institutions for Seismology (IRIS) Data Services map showing the location of seismic stations from all available networks (permanent or temporary) within a radius of 0.18° (about 20 km at mid-latitudes) from the given location of Chokaisan. Users can customize a variety of filters and options in the left panel. Note that if there are no stations are known the map will default to show the entire world with a "No data matched request" error notice.

UNAVCO GPS/GNSS stations

Geodetic Data Services map from UNAVCO showing the location of GPS/GNSS stations from all available networks (permanent or temporary) within a radius of 20 km from the given location of Chokaisan. Users can customize the data search based on station or network names, location, and time window. Requires Adobe Flash Player.

DECADE Data

The DECADE portal, still in the developmental stage, serves as an example of the proposed interoperability between The Smithsonian Institution's Global Volcanism Program, the Mapping Gas Emissions (MaGa) Database, and the EarthChem Geochemical Portal. The Deep Earth Carbon Degassing (DECADE) initiative seeks to use new and established technologies to determine accurate global fluxes of volcanic CO₂ to the atmosphere, but installing CO₂ monitoring networks on 20 of the world's 150 most actively degassing volcanoes. The group uses related laboratory-based studies (direct gas sampling and analysis, melt inclusions) to provide new data for direct degassing of deep earth carbon to the atmosphere.

Large Eruptions of Chokaisan

Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

EarthChem

EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).