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Fig. 2 | Earth, Planets and Space

Fig. 2

From: Spatiotemporal crustal strain distribution around the Ishikari-Teichi-Toen fault zone estimated from global navigation satellite system data

Fig. 2

Calculated strain rate fields and their horizontal velocity field source for two periods: a the period from March 1996 to September 2003; a-1 regional distribution of dilatation and principal strain rate in Hokkaido. Dilatation rates with colors and principal strain vectors at every 0.25° were estimated from the velocity field. Positive dilatation rate values indicate expansion. The red and blue colors for principal strain indicate extension and contraction, respectively. a-2 Enlarged view of the study area. a-3 Horizontal velocity field with respect to site 0128 (Sapporo). b-1, b-2, and b-3 are identical to a-1, a-2, and a-3, respectively, but for the period between January 2014 and December 2017. The four grids with open circles in b-2 are areas that are characterized by changes in temporal strain, as shown in Fig. 3

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