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A magnitude 6.3-6.6 earthquake struck Nikkō, in Tochigi Prefecture, Japan on 25 December 2023.^[1]

Tectonic setting[edit]

The primary tectonic feature of the 1,200 km (750 mi) island chain is the New Hebrides Subduction Zone, the convergent boundary of the Indo-Australian and Pacific Plates. Along the Wadati–Benioff zone, earthquake activity has been observed as shallow, intermediate, and deep-focus events at depths of up to 700 km (430 mi). Volcanic activity is also present along this north-northwest trending and northeast-dipping oceanic trench.^[2]

While much of the island arc experiences intermediate-depth earthquakes along a Wadati–Benioff zone that dips steeply at 70°, the area adjacent to the d’Entrecasteaux Ridge does not. There is a corresponding gap in seismicity that occurs below 50 km (31 mi) where it intrudes into the subduction zone from the west. According to the NUVEL-1 global relative plate motion model, convergence is occurring at roughly 8 cm (3.1 in) per year. The uncertainty, which also affects the Tonga arc, is due to the influence of spreading at the North Fiji Basin.^[3]

Earthquake[edit]

Intensity[edit]

Two people were killed; one by a landslide in Nikkō, and another due to a heart attack in Tokyo.^[4] Fifty-eight others were injured by the earthquake.^[5] A landslide buried numerous houses in Shioya.^[6] Services were interrupted on Shinkansen and local lines, and expressways closed.^[7]

See also[edit]

References[edit]