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Earth, Planets and Space | 2002

Evaluation of recent activity at Satsuma-Iwojima —Felt earthquake on June 8, 1996—

Masato Iguchi; Eiji Saito; Yuji Nishi; Takeshi Tameguri

Emission of large amount of volcanic gas occurs at the summit crater of Satsuma-Iwojima volcano located south of Kyushu, Japan. Sakurajima Volcanological Observatory (SVO), DPRI, Kyoto University has conducted seismic observation at a permanent station 1.5 km WNW of the summit crater since June 1995. Volcanic earthquakes at the volcano are classified into A-type (high frequency), B-type (low frequency), C-type (monochromatic) and tremor. A-type earthquake generated by shear fracture and B-type earthquake with volumetric source are dominant at the volcano. Volcanic activity of Satsuma-Iwojima was evaluated from seismicity of the volcanic earthquakes. During the period of 1995–1998, the seismicity has remained at a constant level with seismic energy release rate of 7×1014 erg/year. The seismicity was as high as that during 1975–1977. The energy release rate of volcanic earthquakes at the volcano has been stable at least for recent 20 years. Within the stable activity, a minor increase in activity occurred in mid-1990’s, as shown by a felt earthquake (M2.9) on June 8, 1996. The earthquake on June 8, 1996 may be related to topographic changes and ground deformation around the summit crater, because a crack with length of 100 m was found at southeast rim of the summit crater in October 1996 and the benchmark near the crack moved eastward by 6 cm during the period from June 1995 to April 1997. The stable activity for 20 years and minor inflation of activity estimated from seismic observation coincides with those from SO2 flux, highest fumarolic temperatures and gas equilibrium temperatures. Although daily number of B-type earthquakes with smaller amplitude increased almost 10 times in September 1998, this increase in the seismicity did not accompany any change of eruptive activity. Unstable seismicity of B-type earthquake may reflect fluctuations of condition in the gas conduit.


Earth, Planets and Space | 2001

Reexamination of moment tensors for initial motion of explosion earthquakes using borehole seismograms at Sakurajima volcano, Japan

Takeshi Tameguri; Masato Iguchi; Kazuhiro Ishihara

We estimated the seismic moment tensor for the initial phase of explosion earthquakes associated with Vulcanian explosions at the andesitic volcano Sakurajima. We applied a waveform inversion method to 24 events observed with borehole seismometers at 6 stations assuming a single triangular source time function. The three diagonal components representing volumetric change were dominant in the estimated moment tensors. The three diagonal components were positive and had almost the same values with the difference among them less than 10% for most of the explosion earthquakes, while non-diagonal components were negligibly small compared with the diagonal ones. Durations of source time functions had a range of 0.2–0.5 s and seismic moments were 1011 ∼ 1012 Nm. We conclude that the explosion earthquakes are initiated by an isotropic expansion.


Journal of Volcanology and Geothermal Research | 2008

Mechanism of explosive eruption revealed by geophysical observations at the Sakurajima, Suwanosejima and Semeru volcanoes

Masato Iguchi; Hiroshi Yakiwara; Takeshi Tameguri; Muhamad Hendrasto; Jun-ichi Hirabayashi


Bulletin of Volcanology | 2009

Swelling of a lava plug associated with a Vulcanian eruption at Sakurajima Volcano, Japan, as revealed by infrasound record: case study of the eruption on January 2, 2007

Akihiko Yokoo; Takeshi Tameguri; Masato Iguchi


Bulletin of the Volcanological Society of Japan | 2002

Mechanism of Explosive Eruptions from Moment Tensor Analyses of Explosion Earthquakes at Sakurajima Volcano, Japan

Takeshi Tameguri; Masato Iguchi; Kazuhiro Ishihara


Earth and Planetary Science Letters | 2016

Stress, strain rate and anisotropy in Kyushu, Japan

Martha K. Savage; Yosuke Aoki; K. Unglert; Takahiro Ohkura; Kodo Umakoshi; Hiroshi Shimizu; Masato Iguchi; Takeshi Tameguri; Takao Ohminato; Jim Mori


Journal of Volcanology and Geothermal Research | 2008

Constraints on the source mechanism of harmonic tremors based on seismological, ground deformation, and visual observations at Sakurajima volcano, Japan

Sukir Maryanto; Masato Iguchi; Takeshi Tameguri


Journal of Volcanology and Geothermal Research | 2009

Temporal change of characteristics of shallow volcano-tectonic earthquakes associated with increase in volcanic activity at Kuchinoerabujima volcano, Japan

Hetty Triastuty; Masato Iguchi; Takeshi Tameguri


Bulletin of Volcanology | 2013

Mechanism of small vulcanian eruptions at Suwanosejima volcano, Japan, as inferred from precursor inflations and tremor signals

Takeshi Nishimura; Masato Iguchi; Hiroshi Yakiwara; Jun Oikawa; Ryohei Kawaguchi; Hiroshi Aoyama; Haruhisa Nakamichi; Yusaku Ohta; Takeshi Tameguri


Earth, Planets and Space | 2016

Rapid dike intrusion into Sakurajima volcano on August 15, 2015, as detected by multi-parameter ground deformation observations

Kohei Hotta; Masato Iguchi; Takeshi Tameguri

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