Prompt gravity signal induced by the 2011 Tohoku-Oki earthquake.
Prompt gravity signal induced by the 2011 Tohoku-Oki earthquake.
复制标题
DOI：
10.1038/ncomms13349
复制
发表时间：
2016-11-22
影响因子：
16.6
通讯作者：
Lognonne, Philippe
中科院分区：
文献类型：
--
作者：
Montagner, Jean-Paul;Juhel, Kevin;Barsuglia, Matteo;Ampuero, Jean Paul;Chassande-Mottin, Eric;Harms, Jan;Whiting, Bernard;Bernard, Pascal;Clevede, Eric;Lognonne, Philippe
在地震破裂期间，甚至在地震波到达之前，预计在所有距离都会发生短暂的重力变化。在这里，我们报告了在2011年Mw 9.0 Tohoku-Oki地震期间超导重力仪和宽带地震仪记录的数据中寻找这种提示重力信号的情况。在地震破裂过程中，观测到一个超过背景噪声的信号，其统计显著性高于99%，振幅为μGal的一个分数，在符号和数量级上与一阶模型的理论预测一致。虽然使用最先进的重力仪和地震仪进行重力信号的即时检测受到背景地震噪声的挑战，但正在开发的重力梯度仪的鲁棒检测可以为地震地震学开辟新的方向，并克服当前地震预警系统受地震波传播速度的限制。从理论上讲，地震产生的重力信号可能先于地震波到达，但直到现在还没有探测到。Montagner等人从2011年的东北大地震中探测到重力信号，从而在地震波到达之前对地震进行预警。
Transient gravity changes are expected to occur at all distances during an earthquake rupture, even before the arrival of seismic waves. Here we report on the search of such a prompt gravity signal in data recorded by a superconducting gravimeter and broadband seismometers during the 2011 Mw 9.0 Tohoku-Oki earthquake. During the earthquake rupture, a signal exceeding the background noise is observed with a statistical significance higher than 99% and an amplitude of a fraction of μGal, consistent in sign and order of magnitude with theoretical predictions from a first-order model. While prompt gravity signal detection with state-of-the-art gravimeters and seismometers is challenged by background seismic noise, its robust detection with gravity gradiometers under development could open new directions in earthquake seismology, and overcome fundamental limitations of current earthquake early-warning systems imposed by the propagation speed of seismic waves. Earthquakes have been theorised to produce gravity signals that may arrive before seismic waves, but until now they had not been detected. Montagner et al. have detected prompt gravity signals from the 2011 Tohoku-Oki earthquake thus allowing an early warning of earthquakes before seismic wave arrival.
登录
查看更多内容
影响因子：
3.9
作者：
Cambiotti, Gabriele;Sabadini, Roberto
通讯作者：
Sabadini, Roberto
影响因子：
56.9
作者：
Han, Shin-Chan;Shum, C. K.;Kuo, Chung-Yen
通讯作者：
Kuo, Chung-Yen
影响因子：
3.9
作者：
Minson, S. E.;Murray, Jessica R.;Gomberg, Joan S.
通讯作者：
Gomberg, Joan S.
影响因子：
2.8
作者：
OKUBO, S
通讯作者：
OKUBO, S
影响因子：
2.8
作者：
Kanamori, Hiroo;Rivera, Luis
通讯作者：
Rivera, Luis