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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Precise aftershock distribution of the 2019 Yamagata-oki earthquake using newly developed simple anchored-buoy ocean bottom seismometers and land seismic stations

Fig. 2

Photographs and schema of the developed simple anchored-buoy type OBS. Right: the ocean bottom recorder includes a three-component velocity-sensitive seismic sensor, hydrophone, recording unit, and batteries. Because two tiltmeters and an azimuth meter are installed in the package, the records can be converted to vertical and two-horizontal components. The flat shape of the package lowers seismic noise by the seafloor current. A photograph of the recorder is superimposed on the schema of the system. The package of the ocean bottom recorder with sinker and anchors is connected to one end of a long rope, and a buoy is attached to the other end. Left: a small boat can install and recover the simple anchored-buoy OBSs. After the deployment, a buoy with a flag and a flashlight performs the role of a mark on the sea surface for other boats

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