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Crustal movements around the Beppu Bay area, East-Central Kyushu, Japan, observed by GPS 1996–1998

Abstract

In order to detect the crustal movement in the Beppu Bay area, where the highest intra-plate strain rates in Japan is expected, precise GPS measurements have been repeatedly conducted since 1994 at one-year intervals. The result shows N-S or NNE-SSE extension taking place at a rate of more than 10 mm/yr around Beppu Bay. This is essentially consistent with the result obtained by the geodetic survey conducted over the last 100 years, and it suggests a constant rate of crustal motion over the period. The result gives a strong constraint for future modeling of the stress field recovery in the area. However, we failed to identify whether the movement occurred at any specific fault. A denser array of GPS points is needed in the area, and especially near the major faults, in order to investigate possible fault-related motion.

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Correspondence to Y. Fukuda.

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Fukuda, Y., Itahara, M., Kusumoto, S. et al. Crustal movements around the Beppu Bay area, East-Central Kyushu, Japan, observed by GPS 1996–1998. Earth Planet Sp 52, 979–984 (2000). https://doi.org/10.1186/BF03352316

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Keywords

  • Crustal Movement
  • Okinawa Trough
  • Baseline Length
  • Median Tectonic Line
  • Institute Cooperative Research Program