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Co-seismic geomagnetic fluctuations and atmospheric disturbances during the 2018 M 6.2 Hualien Earthquake
- Source :
- Terrestrial, Atmospheric and Oceanic Sciences, Vol 30, Iss 3, Pp 449-465 (2019)
- Publication Year :
- 2019
- Publisher :
- Springer, 2019.
-
Abstract
- The strong ground motion of 6 February 2018 M 6.2 Hualien Earthquake triggered a series of co-seismic geomagnetic fluctuations and seismo-traveling atmospheric disturbances (STADs) signatures in infrasonic waves and micro-pressures upon the seismic wave arrival. Networks of 9 QuakeFinder systems, 3 infrasound systems, 2 tiltmeters, 2 micro-barometers, and 11 co-located seismometers are used in this study. Each QuakeFinder system consists of a 3-axes induction magnetometer, an air conductivity sensor, a geophone, and temperature/relative humidity sensors. Co-seismic signatures clearly appear in the induction magnetometers, infrasound systems, and micro-barometers data. The magnetometers register both high- and lowfrequency pulsations. Geomagnetic fluctuations occur upon the seismic wave arrival but last a longer duration, while the STADs lag their co-located seismic waves by about 15 - 45 s. The long-lasting fluctuations recorded by both induction and fluxgate magnetometers suggest that the ground/underground water motion play an important role, which is further conformed by low-frequency fluctuations in the tiltmeter data. In general, the amplitude of geomagnetic fluctuations decays as away from the epicenter. However, unusual large co-seismic geomagnetic fluctuations are detected over areas of the abnormal seismic intensity level and/or the magnetic underground structure with anomalously high susceptibilities.
- Subjects :
- Geology
QE1-996.5
Geophysics. Cosmic physics
QC801-809
Subjects
Details
- Language :
- English
- ISSN :
- 10170839 and 23117680
- Volume :
- 30
- Issue :
- 3
- Database :
- Directory of Open Access Journals
- Journal :
- Terrestrial, Atmospheric and Oceanic Sciences
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.5c5425dc90af49a5aae2f915b1b8176c
- Document Type :
- article
- Full Text :
- https://doi.org/10.3319/TAO.2019.03.11.01