Hisashi Nakahara

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An earthquake of M 6.1 occurred on 3 September 1998, along an active fault at the southwestern foot of Mt. Iwate, a volcano in northeastern Japan. Acceleration records of this earthquake were obtained at seven stations within 40 km of the epicenter. In order to investigate the source process of this earthquake in a broad frequency range, we simultaneously(More)
We estimate high-frequency (4–20 Hz) energy release due to the 2016 Kumamoto, Japan, earthquake sequence, within a time period from April 14 to 26 through envelope inversion analysis applied to the Hi-net continuous seismograms. We especially focus on energy releases after each of the April 14 MJMA6.5 and the April 16 MJMA7.3 earthquakes. The cumulative(More)
Electric properties and current-induced structural changes of carbon nanotubes (CNTs) encapsulating copper nano-rods were studied by in-situ transmission electron microscopy (TEM). The diameter and the length of a copper filled CNT were 18 nm and 256 nm, respectively. The thickness of the graphite layer was about 1 nm. The bias voltage was applied between(More)
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