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Title: Investigation of ionospheric and geomagnetic response during 2011 Tohoku earthquake using ground based measurement
Authors: Yaso, Norbaizura
Hasbi, Alina Marie
Abdullah, Mardina
Keywords: GPS-TEC;Geomagnetic field;Co-seismic ionospheric disturbance (CID);Tsunami
Issue Date: Sep-2016
Publisher: NISCAIR-CSIR, India
Abstract: This paper investigates co-seismic ionospheric disturbances (CID) during the M9.0, 11 March 2011 Tohoku earthquake. The investigation collects data from two sources which are GPS-TEC from GEONET data network and the geomagnetic field from MAGDAS data network. Three types of CID have been detected: direct acoustic wave (894m/s), secondary wave from the Rayleigh surface wave (2862 m/s), and gravity wave from a propagating Tsunami (226 m/s). The directivity of wave propagation has been found to be northward from the epicenter. Short period CID corresponding to direct acoustic waves have been firstly found about 7 min after the main shock and ended 38 min after the main shock with oscillation period varying from 2-7 min. The long period of CID corresponding to Tsunami waves firstly observed 20 min after the main shock, with 10 min of oscillation period and duration of 60 min. Geomagnetic field disturbances have been detected 10-11 min after the main shock with period of 4 min. These geomagnetic field disturbances have been associated with the short-period CID induced by the direct acoustic wave from the epicenter. The correlation between the ionospheric and geomagnetic disturbance shows a good agreement in wave characteristic.
Page(s): 115-125
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.45(3) [September 2016]

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