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Table 1 Observation instruments

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

InstrumentChannels usedSampling rate (Hz)Distance from the hypocenterOutput used
Superconducting gravimeter2 (Kamioka and Matsushiro)40515 km (Kamioka),
436 km (Matsushiro)
Vertical gravity acceleration (m/s2)
Broadband seismometer27 out of 71 (F-net)20From 505 to 1421 kmVertical ground velocity (m/s) converted to acceleration (m/s2)
Tiltmeter553 out of 1412 (Hi-net)20From 264 to 1349 kmGround tilt (rad) converted to horizontal acceleration (m/s2)