Abstract
On 11 March 2011, a great earthquake with magnitude 9.0 has occurred in Tohoku, Japan, more than 1,000 km from South Korea. In fact, seismicity rate in South Korea has increased since the 2011 Tohoku earthquake, although detailed evaluation of its effects on the Korean Peninsula remains incomplete. Now, the high precision space geodesy techniques play a key role in monitoring the crustal strain state and energy variation. This study attempts to evaluate crustal deformation around the Korean Strait after 2011 Tohoku earthquake through a detailed analysis recorded by GPS. Moreover, this study found a different fault characteristic in Japan affect the station displacement prior to GPS data observed among 2011 to 2012. After a year, the strain in Japan found in direction WNW-ESE, while in Korea found in direction WSW-ENE. This finding suggests the likelihood of the existence of a certain tectonic line between the southern part of Korea peninsula and Japan.
Highlights
The 2011 Mw9.0 Tohoku earthquake, Japan, is one of the largest earthquakes ever observed, causing an abrupt change in regional seismicity and large-scale crustal deformation [1,2]
The seismicity rate in South Korea has increased since the 2011 Tohoku earthquake and [6] suggested that this enhanced activity is a direct consequence of the 2011 event, detailed evaluation of its effects on the Korean Peninsula remains incomplete
Velocity of displacement is calculated in mm/year and Delaunay triangle was applied for strain calculation
Summary
The 2011 Mw9.0 Tohoku earthquake, Japan, is one of the largest earthquakes ever observed, causing an abrupt change in regional seismicity and large-scale crustal deformation [1,2]. The Japanese islands are covered with one of the world’s most dense GPS networks and seafloor geodetic stations that recorded coseismic surface displacements caused by the earthquake. The seismicity rate in South Korea has increased since the 2011 Tohoku earthquake and [6] suggested that this enhanced activity is a direct consequence of the 2011 event, detailed evaluation of its effects on the Korean Peninsula remains incomplete. Coseismic and postseismic crustal deformation of South Korea due to the Tohoku earthquake as estimated from Global Positioning System (GPS) data, was dominated by dilatation; that is, either the absolute magnitude of the positive maximum principal straining axis was greater than that of the negative minimum principal straining axis or both the maximum and minimum principal straining axes were positive [10,11]. The GPS stations located near to our study area are used to estimate the strain rates, in attempt to estimate the boundary of Eurasian plate
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