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Table 1 Observation instruments

From: Earthquake-induced prompt gravity signals identified in dense array data in Japan

Instrument

Channels used

Sampling rate (Hz)

Distance from the hypocenter

Output used

Superconducting gravimeter

2 (Kamioka and Matsushiro)

40

515 km (Kamioka),

436 km (Matsushiro)

Vertical gravity acceleration (m/s2)

Broadband seismometer

27 out of 71 (F-net)

20

From 505 to 1421 km

Vertical ground velocity (m/s) converted to acceleration (m/s2)

Tiltmeter

553 out of 1412 (Hi-net)

20

From 264 to 1349 km

Ground tilt (rad) converted to horizontal acceleration (m/s2)