Volcanic Activity of Miyake-jima and Seismic Activity around Kozu-shima and Nii-jima
("jima" and "shima" mean islands.)

August 18, 10:52(JST): a M6.0 (JMA scale) earthquake occurred in the sea near the Miyake-jima

JMA intensity scale 6-lower felt at the Shikine-jima.

August 18, 17:00, Mt. Oyama in the Miyake-jima erupted.


00/09/04 September 4, 2000 University Consortium for the Integrated Volcanological Observation on the Miyake-jima (UCIVOM) was organized.
University Consortium for the Integrated Volcanological Observation on the Miyake-jima (Head: Watanabe) has been organized.
It consists of 6 observation units(seismology, crustal movement, gravity, geothermal and electromagnetic researchˇ˘volcanic gas, geology and material science), Head, and coordinator.
Staffs in charge are shown here


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hypocenter information seismicity seismic analysis
geology gravity geothermal & electromagnetism
GPS current snapshots of the summit of Miyake-jima others


Hypocenter Information

Hypocenter information (manually determined) [Earthquake Observation Center]
Hypocenter information (automatically determined) [Earthquake Observation Center]ˇˇWill be automatically updated.


Seismicity

Wave form data obtained with STS1- broadband seismograph [Tsukuba observation point (Ibaragi prefecture)] data until July 4, 10:00 [Earthquake Information Center]
Seismicity in the sea near Miyake-jima, Kozu-shima, Shikine-jima , and Nii-jima [Earthquake Observation Center; Dr. Sakai]
Movement of hypocenters (animation) 8/3 12:00 - 8/4 12:00 [Earthquake Information Center, Earthquake Observation Center] [08/16 16:30]
Movement of hypocenters (animation) [07/17 12:00]
Movement of hypocenters [07/04 11:30]


Seismic Analysis

tidal change and activity of the Miyake-jima Volcano[ERI Dr. Kasahara][08/25]
Temporary observation of strong motions of Miyake-jima, Kozu-shima, Shikine-jima, Nii-jima[ERI strong motion group][08/13]
Stress change caused by the earthquakes in the sea near Kozu-shima on July 1, 9, and possibility of the induced earthquake in the sear near the Nii-jima [Division of Earth Mechanics Dr. Toda] [07/19 10:30]
Broadband waveform data during the summit collapse of the Miyake- jima on July 8 [Volcano Research Center]
EICseismological note: The M6.0 earthquake near Kozu-shima, and the M4.9 earthquake near the Shikin e-jima on August 18, 2000 [Earthquake Information Center]
EIC seismological note: The M6.4 earthquake near the Miyake-jima on July 30, 2000 [Earthquake Information Center]
EIC seismological note: The M5.9 earthquake near the Kozu-shima on July 24, 2000 [Earthquake Information Center]
EIC seismological note: The M6.2 earthquake of Jule 15, 2000 in the sea near Nii-jima [Earthquake Information Center]
EIC seismological note: A series of long-period earthquakes around Miyake-jima [Earthquake Information Center]
EIC seismological note: Mechanism of the long-period earthquake around Miyake-jima on July 14, 2000 [Earthquake Information Center]
Waveform data during the eruption obtained with FREESIA broadband seismograph [within Japan] [07/15 19:00]
EIC seismological note: The long-period earthquake during the eruption of Miyake-jima volcano on July 8 [Earthquake Information Center] [07/12]
Waveform data during the eruption obtained with J-array broadband seismograph [within Japan] [07/09 01:30]
Long-period component is dominant.
EIC seismological note: The M6.0 earthquake near the Kozu-shima on July 9, 2000 [Earthquake Information Center]
EIC seismological note: The M6.4 earthquake near the Kozu-shima on July 1, 2000 [Earthquake Information Center] [07/01 22:00]


Geology

Collection of geological observation of the Miyake-jima eruptions in 2000 [Volcano Research Center; Nakada lab]

These are collected data of collapse topography, volcanic ash research, groundwater level obtained by ERI geology group.
Analyzed results of research regarding distribution of volcanic ash produced in the eruption on August 10, 2000[Volcano Research Center; Dr. Shimano][08/12]
Chemical composition of volcanic products of Miyakejima 2000 eruption[Div. Geodynamics; Dr. Yasuda][07/31]
Miyake-jima information [Dr. Shimano]


Gravity

Gravity change of the Miyake-jima volcano (2)[ERI gravity group][09/07]
Gravity change of the Miyake-jima volcano (1)[ERI gravity group][08/25]


Geothermal, Electromagnetism

observation of the Geothermal of the Miyake-jima with infrared picture of NOAA during night [Volcano Research Center; Dr. Kaneko]
observation of the temperature of fumarolic gas and geomagnetic total force of the Miyake-jima volcano summit, Mt. Oyama[ERI heat, electromagnetic group]


GPS

Crustal movement detected with a dense GPS network in the Miyake-jima [08/28]
An explanation for the deformation around the Kozu-shima, Shikine-jima, and Nii-jima measured by the GEONET (GSI)[ERI Dr. Iio][08/25]
Results of the automatic GPS analysis on the Miyake-jima


Current snapshots of the summit of the Miyake-jima

Photos of Miyake-jima on Sep. 10 [Volcano Research Center; Mr. Terada]


[ERI]