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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Distribution of b-value in the central and southern Ryukyu: is the low b-value in the rift-axis of the Okinawa Trough accurate?

Fig. 1

Regional map and comparison of MW and MJ (January 2001–December 2019). a Distribution of hypocenters in the Ryukyu (M ≥ 3.0, January 2001–December 2019). YO: Yonaguni area; YA: Yaeyama area; MI: Miyako area; KU: Kumejima area; AM: Amami area, IS: Ishigaki Island. Red circles indicate earthquakes. The contour is bathymetry from Chikasada (2020). The location of the plate boundary is from Bird (2003). The inset shows the regional tectonic map. b Comparison of MW and MJ at YA. The calculation area is shown in Figurer 1a. Red circles indicate MD or Md, and blue triangles indicate MV or Mv. The rectangle indicates the calculation region. To distinguish the density of the points on plot, a uniform random number between -0.05 and 0.05 was added to the magnitude value and displayed in the figure. c FMD of MW. Bars show the number of earthquakes for each bin. The red line indicates the cumulative number of earthquakes. d The same as c but for MJ

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