Seismo-Geomagnetic Pulsations Triggered by Rayleigh Waves of the 11 March 2011 M 9.0 Tohoku-Oki Earthquake

被引：7

作者：

Yen, Horng-Yuan ^{[1
]}

Chen, Chun-Rong ^{[1
]}

Lo, Yu-Tsung ^{[1
]}

Shin, Tzay-Chyn ^{[2
]}

Li, Qi ^{[3
]}

机构：

[1] Natl Cent Univ, Dept Earth Sci, Jhongli, Taiwan

[2] Cent Weather Bur, Taipei, Taiwan

[3] China Earthquake Adm, Inst Geophys, Beijing, Peoples R China

来源：

TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES | 2015年 / 26卷 / 02期

关键词：

Tohoku-oki earthquake; Rayleigh wave; Magnetic pulsations; TRAVELING IONOSPHERIC DISTURBANCES; PACIFIC COAST; MAGNETIC-FIELD; MIYAGI PREFECTURE; M7.1; EARTHQUAKE; NE JAPAN; AFTERSHOCKS; TAIWAN; ATMOSPHERE; TSUNAMI;

D O I：

10.3319/TAO.2014.10.09.01(T)

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This study reports on geomagnetic pulsations excited by traveling Rayleigh waves. The geomagnetic total intensity fields recorded using 12 magnetometers are utilized to examine seismo-magnetic pulsations induced by the 2011 M 9.0 Tohoku-oki earthquake. Geomagnetic data and seismograms from 4 co-located seismometers are examined and cross-compared to determine whether magnetic variations result changes in space weather or traveling Rayleigh waves. A 150 - 250 s band-pass filter was adopted to determine the arrival times and amplitudes of the seismo-magnetic pulsations. Seismo-magnetic pulsations with pronounced periods of about 200 s and amplitudes of 0.2 - 1.2 nT appear at distances ranging from 190 - 4600 km from the epicenter. Pulse speed of 3.8 km s(-1) estimated from the epicentral distances and arrival times indicates that the seismo-magnetic pulsations were induced by Rayleigh waves produced by the Tohoku-oki earthquake. The seismo-magnetic pulsations constantly lag seismic wave pulses by about 6.3 minutes, confirming that ionospheric conductivity affects magnetic fields.

引用

页码：95 / 101

页数：7

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