Seismo-tsunamigenic ionospheric hole triggered by M 9.0 2011 off the pacific coast of tohoku earthquake

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Title:	Seismo-tsunamigenic ionospheric hole triggered by M 9.0 2011 off the pacific coast of tohoku earthquake
Authors:	劉正彥;Yen, Horng-Yuan;Chen, Chun-Rong;Lo, Yu-Tsung;Shin, Tzay-Chyn;Li, Qi
Contributors:	地球科學學院太空科學與工程學系
Keywords:	Acoustic gravity wave;Earthquake;Ionospheric disturbance;Ionospheric hole;Rayleigh wave;Tsunami
Date:	2012-06-01
Issue Date:	2026-04-23 11:05:57 (UTC+8)
Publisher:	Chinese Geoscience Union;Springer
Abstract:	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. 出版者： Springer 出版日期： 2012-01-01 出處： TAO : Terrestrial, atmospheric, and oceanic sciences, 2012-01, Vol.23 (3), p.095 資源來源： Journals學術期刊資料庫(原CEPS) 識別號： ISSN: 1017-0839 識別號： EISSN: 2311-7680 識別號： DOI: 10.3319/TAO.2011.11.14.01(AA)
Appears in Collections:	[DEPARTMENT OF SPACE SCIENCE AND ENGINEERING] journal & Dissertation

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