Journal
REMOTE SENSING
Volume 12, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/rs12111777
Keywords
remote sensing; seismo-conductivity anomalies; Parkinson vector; the Jiuzhaigou earthquake
Categories
Funding
- National Key R&D Program of China [2018YFC1503705]
- Ministry of Science and Technology of the Republic of China, Taiwan [MOST 107-2119-M-008-018, MOST 108-2119-M-008-001]
- Sichuan earthquake Agency-Research Team of GNSS [201803]
- National Natural Science Foundation of China [41974073]
- China Earthquake Science Foundation of Xinjiang [202001]
- Center for Astronautical Physics and Engineering (CAPE) from the Featured Area Research Center program within the framework of Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan
Ask authors/readers for more resources
Changes in the underlying conductivity around hypocenters are generally considered one of the promising mechanisms of seismo-electromagnetic anomaly generation. Parkinson vectors are indicators of high-conductivity materials and were utilized to remotely monitor conductivity changes during the M-W 6.5 Jiuzhaigou earthquake (103.82 degrees E, 33.20 degrees N) on 8 August 2017. Three-component geomagnetic data recorded in 2017 at nine magnetic stations with epicenter distances of 63-770 km were utilized to compute the azimuths of the Parkinson vectors based on the magnetic transfer function. The monitoring and background distributions at each station were constructed by using the azimuths within a 15-day moving window and over the entire study period, respectively. The background distribution was subtracted from the monitoring distribution to mitigate the effects of underlying inhomogeneous electric conductivity structures. The differences obtained at nine stations were superimposed and the intersection of a seismo-conductivity anomaly was located about 70 km away from the epicenter about 17 days before the earthquake. The anomaly disappeared about 7 days before and remained insignificant after the earthquake. Analytical results suggested that the underlying conductivity close to the hypocenter changed before the Jiuzhaigou earthquake. These changes can be detected simultaneously by using multiple magnetometers located far from the epicenter. The disappearance of the seismo-conductivity anomaly after the earthquake sheds light on a promising candidate of the pre-earthquake anomalous phenomena.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available