A network of superconducting gravimeters detects submicrogal coseismic gravity changes.
With high-resolution continuous gravity recordings from a regional network of superconducting gravimeters, we have detected permanent changes in gravity acceleration associated with a recent large earthquake. Detected changes in gravity acceleration are smaller than 10(-8) meters seconds(-2) (1 micro-Galileo, about 10(-9) times the surface gravity acceleration) and agree with theoretical values calculated from a dislocation model. Superconducting gravimetry can contribute to the studies of secular gravity changes associated with tectonic processes.
Ocean Research Institute, University of Tokyo, 1-15-1, Minamidai, Nakano, Tokyo 164-8639, Japan. imanishi@ori.u-tokyo.ac.jp
Yuichi
Y
Imanishi
Tadahiro
T
Sato
Toshihiro
T
Higashi
Wenke
W
Sun
Shuhei
S
Okubo