STRONG-MOTION SEISMOGRAPH NETWORK OPERATED BY NIED: K-NET AND KiK-net

Strong motions observed by K-NET and KiK-net during the 2016 Kumamoto earthquake sequence

The nationwide strong-motion seismograph network of K-NET and KiK-net in Japan successfully recorded the strong ground motions of the 2016 Kumamoto earthquake sequence, which show the several notable characteristics. For the first large earthquake with a JMA magnitude of 6.5 (21:26, April 14, 2016, JST), the large strong motions are concentrated near the epicenter and the strong-motion attenuat...

Estimating near-surface shear wave velocities in Japan by applying seismic interferometry to KiK-net data

We estimate shear-wave velocities in the shallow subsurface throughout Japan by applying seismic interferometry to the data recorded with KiK-net, a strongmotion network in Japan. Each KiK-net station has two receivers; one receiver on the surface and the other in a borehole. By using seismic interferometry, we extract the shear wave that propagates between these two receivers. Applying this me...

Net bundles over posets and K-theory

We proceed with the study of net bundles over partially ordered sets (posets), defined as the analogues of ordinary fibre bundles. To this end, we analyze the connection between homotopy, net homology and net cohomology of a poset, providing versions of classical Hurewicz theorems. Focusing our attention to Hilbert net bundles, we define the K-theory of a poset and introduce functions over the ...

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ε-Net Approach to Sensor k-Coverage

Wireless sensors rely on battery power, and in many applications it is difficult or prohibitive to replace them. Hence, in order to prolongate the system’s lifetime, some sensors can be kept inactive while others perform all the tasks. In this paper, we study the k-coverage problem of activating the minimum number of sensors to ensure that every point in the area is covered by at least k sensor...