Crustal deformation caused by magma migration in the northern Izu Islands, Japan

Nishimura, Takuya; Ozawa, Shinzaburo; Murakami, Makoto; Sagiya, Takeshi; Tada, Takeshi; Kaidzu, Masaru; Ukawa, Motoo

doi:10.1029/2001gl013051

Cited by 110 publications

(116 citation statements)

References 6 publications

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“…This has often been observed during dike intrusions, for instance in Afar in 2006 [Grandin et al, 2009;Keir et al, 2009], at the volcanic island of Izu in 2000 [Nishimura et al, 2001] or during the 2007 Natron faulting and diking event [Baer et al, 2008;Calais et al, 2008;Biggs et al, 2009]. Large earthquakes, such as the 3 February 2002 5.9 M w Bukavu event [d 'Oreye et al, 2011], or the October 24, 2002 6.2 M w south Lake Kivu event ( Figure S8 in the auxiliary material), might remain undetected by interferometry if they were to occur beneath Lake Kivu or in areas of low coherence.…”

Section: Eruption Modelmentioning

confidence: 99%

Magma sources involved in the 2002 Nyiragongo eruption, as inferred from an InSAR analysis

Wauthier¹,

Cayol²,

Kervyn³

et al. 2012

J. Geophys. Res.

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along a 20 km-long fracture network extending from the volcano to the city of Goma. The event was captured by InSAR data from the ERS-2 and RADARSAT-1 satellites. A combination of 3D numerical modeling and inversions is used to analyze these displacements. Using Akaike Information Criteria, we determine that a model with two subvertical dikes is the most likely explanation for the 2002 InSAR deformation signal. A first, shallow dike, 2 km high, is associated with the eruptive fissure, and a second, deeper dike, 6 km high and 40 km long, lies about 3 km below the city of Goma. As the deep dike extends laterally for 20 km beneath the gas-rich Lake Kivu, the interaction of magma and dissolved gas should be considered as a significant hazard for future eruptions. A likely scenario for the eruption is that the magma supply to a deep reservoir started ten months before the eruption, as indicated by LP events and tremor. Stress analysis indicates that the deep dike could have triggered the injection of magma from the lake and shallow reservoir into the eruptive dike. The deep dike induced the opening of the southern part of this shallow dike, to which it transmitted magma though a narrow dike. This model is consistent with the geochemical analysis, the lava rheology and the pre-and post-eruptive seismicity. We infer low overpressures (1-10 MPa) for the dikes. These values are consistent with lithostatic crustal stresses close to the dikes and low magma pressure. As a consequence, the dike direction is probably not controlled by stresses but rather by a reduced tensile strength, inherited from previous rift intrusions. The lithostatic stresses indicate that magmatic activity is intense enough to relax tensional stresses associated with the rift extension.

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Section: Eruption Modelmentioning

confidence: 99%

Magma sources involved in the 2002 Nyiragongo eruption, as inferred from an InSAR analysis

Wauthier¹,

Cayol²,

Kervyn³

et al. 2012

J. Geophys. Res.

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“…The effects due to the 1996, 2002 and 2007 Boso SSEs (Ozawa 2014) and the 2000 eruption of Miyakejima volcano (Nishimura et al 2001) were also removed in the same manner, except for setting a = 0 in the above fitting function.…”

Section: Gnss Data Analysismentioning

confidence: 99%

Two long-term slow slip events around Tokyo Bay found by GNSS observation during 1996–2011

Tanaka

Yabe

2017

Earth Planets Space

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Slow slip events (SSEs) with durations ranging from days to more than a decade have been observed in plate subduction zones around the world. In the Kanto district in Japan, several SSEs have been identified based on geodetic observations. However, none of these events have had durations largely exceeding a year. In this study, we show that long-term SSEs with durations longer than 3 years occurred before the year 2000 and after 2007 on the upper interface of the Philippine Sea Plate at depths of 30-40 km. The fault model determined by inversion of global navigation satellite system data is located northeast of Tokyo Bay, where a seismic gap and low seismic wave velocities were detected by seismological observations. Moreover, the acceleration periods of the fault slip corresponded well with increases in the background seismicity for shallower earthquakes. The slip history was also temporally correlated with the long-term shear stress changes governed mainly by non-tidal variations in the ocean bottom pressure. However, the predicted slip from the long-term stress change was too small to reproduce the observed slow slips. To prove the causal relationship between the SSEs and the external stress change, more advanced modeling is necessary to confirm whether such a small slip can trigger an SSE.

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“…4). These uplift events were caused by the development of a pressure source beneath Kouzushima and dike intrusion associated with the AD 2000 eruption of Miyakejima Volcano, respectively (Kimata et al 2000;Murakami et al 2001;Nishimura et al 2001;Yamaoka et al 2005). Thus, we conclude that this episode of crustal deformation, from 1990 to 2014, contributed to the emergence of Group A.…”

Section: Uplift Eventmentioning

confidence: 81%

“…This uplift is related to a pressure source located beneath northeastern Kouzushima (Kimata et al 2000) and dike intrusion associated with the AD 2000 eruption of Miyakejima volcano, southeast of Kouzushima (Fig. 2) Nishimura et al 2001;Yamaoka et al 2005).…”

Section: Study Areamentioning

confidence: 99%

Late Holocene uplift of the Izu Islands on the northern Zenisu Ridge off Central Japan

Kitamura

Imai

Mitsui

et al. 2017

Prog Earth Planet Sci

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To clarify the Holocene uplift history of the Izu Islands, Japan, we analyze the elevations and 14 C ages of emerged sessile assemblages measured by accelerator mass spectrometry (AMS) on the islands of Niijima, Jinaijima, Shikinejima, and Kouzushima, on the northern Zenisu Ridge. The results suggest that uplift events took place after AD 1950 (uplift event 1), during AD 786-1891 (uplift event 2), during AD 600-1165 (uplift event 3), and during AD 161-686 (uplift event 4), although uplift events 3 and 4 are identified only at Kouzushima. The minimum amount of uplift was estimated to be 0.4-0.9 m in uplift event 1, 2.4-2.7 m in uplift event 2, 3.6 m in uplift event 3, and 3.3-8.1 m in uplift event 4. These events could have been caused by volcanic activity or strong earthquakes. There also remains the possibility that uplift event 2 was caused by the AD 1498 Meio earthquake; in contrast to the previous interpretation, the ages of uplift events are significantly older than the earthquake, based on conventional (non-AMS) methods.

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Crustal deformation caused by magma migration in the northern Izu Islands, Japan

Abstract: Abstract.Intense crustal activity including earthquake In this study, we show the crustal deformation observed at the permanent GPS sites and construct a model based on the observed displacements. The dates and times in this article are based on Universal time(UT).

Cited by 110 publications

References 6 publications

Magma sources involved in the 2002 Nyiragongo eruption, as inferred from an InSAR analysis

Magma sources involved in the 2002 Nyiragongo eruption, as inferred from an InSAR analysis

Two long-term slow slip events around Tokyo Bay found by GNSS observation during 1996–2011

Late Holocene uplift of the Izu Islands on the northern Zenisu Ridge off Central Japan

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