The Hengchun earthquake doublet off southern Taiwan

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Two earthquakes struck in the Luzon Strait off Hengchun at the southern tip of Taiwan, eight minutes apart: the first at 12:26 UTC at magnitude about 7.0, the second at 12:34 UTC at about 6.9, at focal depths of the order of 44 and 50 km. They were the largest events recorded in south-western Taiwan in a century. A small tsunami was recorded on nearby tide gauges. The seismic damage on land was comparatively limited; what made the event globally significant happened on the seabed, where the shaking set submarine landslides and sediment density flows moving down the canyon system toward the Manila Trench.

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