Physics – Plasma Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3745n&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 19, p. 3745-3748
Physics
Plasma Physics
34
Ionosphere: Auroral Ionosphere, Ionosphere: Plasma Waves And Instabilities, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Turbulence
Scientific paper
Intense crustal activity including earthquake swarms, eruptions, and a caldera formation in the northern Izu Islands started on June 26, 2000, accompanied with large crustal deformation. Permanent GPS data reveals the spatial pattern and time evolution of ground deformation. The observations reveal shrinking and subsidence of Miyakejima and extension between Kouzushima and Niijima. We constructed a source model to explain the observed displacements during the period between June 26 and the end of August. The model consists of a deflation source (0.12 km3) beneath Miyakejima, tensile faults (1.04 km3) located between Miyakejima and Kouzushima, and several shear faults. Mass balance considerations suggest that a large amount of magma migrated 30 km from Miyakejima toward Kouzushima.
Kaidzu Masaru
Murakami Makoto
Nishimura Takuya
Ozawa Shinzaburo
Sagiya Takeshi
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